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Pham TA, Kang SH, Ozbek Y, Yoon M, Zhang P. Distance-Dependent Evolution of Electronic States in Kagome-Honeycomb Lateral Heterostructures in FeSn. ACS Nano 2024; 18:8768-8776. [PMID: 38488038 DOI: 10.1021/acsnano.3c11381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
In this work, we demonstrate the formation and electronic influence of lateral heterointerfaces in FeSn containing Kagome and honeycomb layers. Lateral heterostructures offer spatially resolved property control, enabling the integration of dissimilar materials and promoting phenomena not typically observed in vertical heterostructures. Using the molecular beam epitaxy technique, we achieve a controllable synthesis of lateral heterostructures in the Kagome metal FeSn. With scanning tunneling microscopy/spectroscopy in conjunction with first-principles calculations, we provide a comprehensive understanding of the bonding motif connecting the Fe3Sn-terminated Kagome and Sn2-terminated honeycomb surfaces. More importantly, we reveal a distance-dependent evolution of the electronic states in the vicinity of the heterointerfaces. This evolution is significantly influenced by the orbital character of the flat bands. Our findings suggest an approach to modulate the electronic properties of the Kagome lattice, which should be beneficial for the development of future quantum devices.
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Affiliation(s)
- Tuan Anh Pham
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
| | - Seoung-Hun Kang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yasemin Ozbek
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Pengpeng Zhang
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
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2
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Krogel JT, Ichibha T, Saritas K, Yoon M, Reboredo FA. Predictions of delafossite-hosted honeycomb and kagome phases. Phys Chem Chem Phys 2024; 26:8327-8333. [PMID: 38391147 DOI: 10.1039/d3cp04039a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Delafossites, typically denoted by the formula ABO2, are a class of layered materials that exhibit a wide range of electronic and optical properties. Recently, the idea of modifying these delafossites into ordered kagome or honeycomb phases via strategic doping has emerged as a potential way to tailor these properties. In this study, we use high-throughput density functional theory calculations to explore many possible candidate kagome and honeycomb phases by considering dopants selected from the parent compounds of known ternary delafossite oxides from the inorganic crystal structure database. Our results indicate that while A-site in existing delafossites can host a limited range of elemental specifies, and display a low propensity for mixing or ordering, the oxide sub-units in the BO2 much more readily admit guest species. Our study identifies four candidate B-site kagome and fifteen candidate B-site honeycombs with a formation energy more than 50 meV f.u.-1 below other competing phases. The ability to predict and control the formation of these unique structures offers exciting opportunities in materials design, where innovative properties can be engineered through the selection of specific dopants. A number of these constitute novel correlated metals, which may be of interest for subsequent efforts in synthesis. These novel correlated metals may have significant implications for quantum computing, spintronics, and high-temperature superconductivity, thus inspiring future experimental synthesis and characterization of these proposed materials.
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Affiliation(s)
- Jaron T Krogel
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
| | - Tomohiro Ichibha
- School of Information Science, JAIST, 1-1 Asahidai, Nomi, Ishikawa, 923-1292, Japan
| | - Kayahan Saritas
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
| | - Fernando A Reboredo
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
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3
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Jang GG, Jung GS, Seo J, Keum JK, Yoon M, Damron JT, Naskar AK, Custelcean R, Kasturi A, Yiacoumi S, Tsouris C. Tailoring Chemical Absorption-Precipitation to Lower the Regeneration Energy of a CO 2 Capture Solvent. ChemSusChem 2024; 17:e202300735. [PMID: 37682803 DOI: 10.1002/cssc.202300735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/10/2023]
Abstract
Solvent-based CO2 capture consumes significant amounts of energy for solvent regeneration. To improve energy efficiency, this study investigates CO2 fixation in a solid form through solvation, followed by ionic self-assembly-aided precipitation. Based on the hypothesis that CO3 2- ions may bind with monovalent metal ions, we introduced Na+ into an aqueous hexane-1,6-diamine solution where CO2 forms carbamate and bicarbonate. Then, Na+ ions in the solvent act as a seed for ionic self-assembly with diamine carbamate to form an intermediate ionic complex. The recurring chemical reactions lead to the formation of an ionic solid from a mixture of organic carbamate/carbonate and inorganic sodium bicarbonate (NaHCO3 ), which can be easily removed from the aqueous solvent through sedimentation or centrifugation and heated to release the captured CO2 . Mild-temperature heating of the solids at 80-150 °C causes decomposition of the solid CO2 -diamine-Na molecular aggregates and discharge of CO2 . This sorbent regeneration process requires 6.5-8.6 GJ/t CO2 . It was also found that the organic carbamate/carbonate solid, without NaHCO3 , contains a significant amount of CO2 , up to 6.2 mmol CO2 /g-sorbent, requiring as low as 2.9-5.8 GJ/t CO2 . Molecular dynamic simulations support the hypothesis of using Na+ to form relatively less stable, yet sufficiently solid, complexes for the least energy-intensive recovery of diamine solvents compared to bivalent carbonate-forming ions.
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Affiliation(s)
- Gyoung Gug Jang
- Manufacturing Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Gang Seob Jung
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Jiho Seo
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Jong K Keum
- Center for Nanophase Materials Science and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Josh T Damron
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Amit K Naskar
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Radu Custelcean
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Abishek Kasturi
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Sotira Yiacoumi
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Costas Tsouris
- Manufacturing Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
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4
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Tian M, Tennyson WD, Yoon M, Puretzky AA, Geohegan DB, Duscher G, Eres G. Role of Curvature in Stabilizing Boron-Doped Nanocorrugated Graphene. ACS Appl Mater Interfaces 2024; 16:1276-1282. [PMID: 38109559 DOI: 10.1021/acsami.3c10664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Boron-doped carbon nanostructures have attracted great interest recently because of their remarkable electrocatalytic performance comparable to or better than that of conventional metal catalysts. In a previous work (Carbon 123, 605 (2017)), we reported that along with significant performance improvement, B doping enhances the oxidation resistance of few-layer graphene (FLG) that provides increased structural stability for intermediate-temperature fuel-cell electrodes. In general, detailed characterization of the atomic and electronic structure transformations that occur in B-doped carbon nanostructures during fuel-cell operation is lacking. In this work, we use aberration-corrected scanning transmission electron microscopy, nanobeam electron diffraction, and electron energy-loss spectroscopy (EELS) to characterize the atomic and electronic structures of B-doped FLG before and after fuel-cell operation. These data point to the nanoscale corrugation of B-doped FLGs as the key factor responsible for increased stability and high corrosion resistance. The similarity of the 1s to π* and σ* transition features in the B K-edge EELS to those in B-doped carbon nanotubes provides an estimate for the curvature of nanocorrugation in B-FLG.
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Affiliation(s)
- Mengkun Tian
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Wesley D Tennyson
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - David B Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Gyula Eres
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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5
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Dyck O, Yeom S, Lupini AR, Swett JL, Hensley D, Yoon M, Jesse S. Top-Down Fabrication of Atomic Patterns in Twisted Bilayer Graphene. Adv Mater 2024; 36:e2312065. [PMID: 38102090 DOI: 10.1002/adma.202312065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
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6
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Lee HT, Kim J, Lee JS, Yoon M, Park HR. More Than 30 000-fold Field Enhancement of Terahertz Nanoresonators Enabled by Rapid Inverse Design. Nano Lett 2023; 23:11685-11692. [PMID: 38060838 DOI: 10.1021/acs.nanolett.3c03572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
The rapid development of 6G communications using terahertz (THz) electromagnetic waves has created a demand for highly sensitive THz nanoresonators capable of detecting these waves. Among the potential candidates, THz nanogap loop arrays show promising characteristics but require significant computational resources for accurate simulation. This requirement arises because their unit cells are 10 times smaller than millimeter wavelengths, with nanogap regions that are 1 000 000 times smaller. To address this challenge, we propose a rapid inverse design method using physics-informed machine learning, employing double deep Q-learning with an analytical model of the THz nanogap loop array. In ∼39 h on a middle-level personal computer, our approach identifies the optimal structure through 200 000 iterations, achieving an experimental electric field enhancement of 32 000 at 0.2 THz, 300% stronger than prior results. Our analytical model-based approach significantly reduces the amount of computational resources required, offering a practical alternative to numerical simulation-based inverse design for THz nanodevices.
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Affiliation(s)
- Hyoung-Taek Lee
- Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea
| | - Jeonghoon Kim
- Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea
| | - Joon Sue Lee
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Hyeong-Ryeol Park
- Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea
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7
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Kang SH, Kang M, Hwang SW, Yeom S, Yoon M, Ok JM, Yoon S. Theoretical Investigation of Delafossite-Cu 2ZnSnO 4 as a Promising Photovoltaic Absorber. Nanomaterials (Basel) 2023; 13:3111. [PMID: 38133008 PMCID: PMC10745759 DOI: 10.3390/nano13243111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 12/06/2023] [Accepted: 12/08/2023] [Indexed: 12/23/2023]
Abstract
In the quest for efficient and cost-effective photovoltaic absorber materials beyond silicon, considerable attention has been directed toward exploring alternatives. One such material, zincblende-derived Cu2ZnSnS4 (CZTS), has shown promise due to its ideal band gap size and high absorption coefficient. However, challenges such as structural defects and secondary phase formation have hindered its development. In this study, we examine the potential of another compound, Cu2ZnSnO4 (CZTO), with a similar composition to CZTS as a promising alternative. Employing ab initio density function theory (DFT) calculations in combination with an evolutionary structure prediction algorithm, we identify that the crystalline phase of delafossite structure is the most stable among the 900 (meta)stable CZTO. Its thermodynamic stability at room temperature is also confirmed by the molecular dynamics study. Excitingly, this new phase of CZTO displays a direct band gap where the dipole-allowed transition occurs, making it a strong candidate for efficient light absorptions. Furthermore, the estimation of spectroscopic limited maximum efficiency (SLME) directly demonstrates the high potential of delafossite-CZTO as a photovoltaic absorber. Our numerical results suggest that delafossite-CZTO holds promise for future photovoltaic applications.
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Affiliation(s)
- Seoung-Hun Kang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; (S.-H.K.); (S.Y.)
| | - Myeongjun Kang
- Department of Physics, Pusan National University, Busan 46241, Republic of Korea;
| | - Sang Woon Hwang
- Department of Physics, Gachon University, Seongnam 13120, Republic of Korea;
| | - Sinchul Yeom
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; (S.-H.K.); (S.Y.)
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; (S.-H.K.); (S.Y.)
| | - Jong Mok Ok
- Department of Physics, Pusan National University, Busan 46241, Republic of Korea;
| | - Sangmoon Yoon
- Department of Physics, Gachon University, Seongnam 13120, Republic of Korea;
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8
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Ahn J, Kang SH, Yoon M, Ganesh P, Krogel JT. Stacking Faults and Topological Properties in MnBi 2Te 4: Reconciling Gapped and Gapless States. J Phys Chem Lett 2023; 14:9052-9059. [PMID: 37782759 DOI: 10.1021/acs.jpclett.3c01939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Despite theoretical predictions of a gapped surface state for the magnetic topological insulator MnBi2Te4 (MBT), there has been a series of experimental evidence pointing toward gapless states. Here, we theoretically explore how stacking faults could influence the topological characteristics of MBT. We envisage a scenario that a stacking fault exists at the surface of MBT, causing the uppermost layer to deviate from the ground state and its interlayer separation to be expanded. This stacking fault with modulated interlayer couplings hosts a nearly gapless state within the topmost layer due to charge redistribution as the outermost layer recedes. Furthermore, we find evidence of spin-momentum locking and preservation of weak band inversion in the gapless surface state, suggesting the nontrivial topological surface states in the presence of the stacking fault. Our findings provide a plausible elucidation to the long-standing conundrum of reconciling the observation of gapped and gapless states on MBT surfaces.
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Affiliation(s)
- Jeonghwan Ahn
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Seoung-Hun Kang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Panchapakesan Ganesh
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jaron T Krogel
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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9
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Mondal A, Biswas C, Park S, Cha W, Kang SH, Yoon M, Choi SH, Kim KK, Lee YH. Low Ohmic contact resistance and high on/off ratio in transition metal dichalcogenides field-effect transistors via residue-free transfer. Nat Nanotechnol 2023:10.1038/s41565-023-01497-x. [PMID: 37666942 DOI: 10.1038/s41565-023-01497-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 08/01/2023] [Indexed: 09/06/2023]
Abstract
Beyond-silicon technology demands ultrahigh performance field-effect transistors. Transition metal dichalcogenides provide an ideal material platform, but the device performances such as the contact resistance, on/off ratio and mobility are often limited by the presence of interfacial residues caused by transfer procedures. Here, we show an ideal residue-free transfer approach using polypropylene carbonate with a negligible residue coverage of ~0.08% for monolayer MoS2 at the centimetre scale. By incorporating a bismuth semimetal contact with an atomically clean monolayer MoS2 field-effect transistor on hexagonal boron nitride substrate, we obtain an ultralow Ohmic contact resistance of ~78 Ω µm, approaching the quantum limit, and a record-high on/off ratio of ~1011 at 15 K. Such an ultra-clean fabrication approach could be the ideal platform for high-performance electrical devices using large-area semiconducting transition metal dichalcogenides.
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Affiliation(s)
- Ashok Mondal
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Chandan Biswas
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea.
| | - Sehwan Park
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Wujoon Cha
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Seoung-Hun Kang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Soo Ho Choi
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Ki Kang Kim
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Young Hee Lee
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Republic of Korea.
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea.
- Department of Physics, Sungkyunkwan University, Suwon, Republic of Korea.
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10
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Dyck O, Yeom S, Lupini AR, Swett JL, Hensley D, Yoon M, Jesse S. Top-Down Fabrication of Atomic Patterns in Twisted Bilayer Graphene. Adv Mater 2023; 35:e2302906. [PMID: 37309684 DOI: 10.1002/adma.202302906] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 05/23/2023] [Indexed: 06/14/2023]
Abstract
Atomic-scale engineering typically involves bottom-up approaches, leveraging parameters such as temperature, partial pressures, and chemical affinity to promote spontaneous arrangement of atoms. These parameters are applied globally, resulting in atomic-scale features scattered probabilistically throughout the material. In a top-down approach, different regions of the material are exposed to different parameters, resulting in structural changes varying on the scale of the resolution. In this work, the application of global and local parameters is combined in an aberration-corrected scanning transmission electron microscope (STEM) to demonstrate atomic-scale precision patterning of atoms in twisted bilayer graphene. The focused electron beam is used to define attachment points for foreign atoms through the controlled ejection of carbon atoms from the graphene lattice. The sample environment is staged with nearby source materials such that the sample temperature can induce migration of the source atoms across the sample surface. Under these conditions, the electron-beam (top-down) enables carbon atoms in the graphene to be replaced spontaneously by diffusing adatoms (bottom-up). Using image-based feedback control, arbitrary patterns of atoms and atom clusters are attached to the twisted bilayer graphene with limited human interaction. The role of substrate temperature on adatom and vacancy diffusion is explored by first-principles simulations.
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Affiliation(s)
- Ondrej Dyck
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Sinchul Yeom
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Andrew R Lupini
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Jacob L Swett
- Biodesign Institute, Arizona State University, Tempe, AZ, 87287, USA
| | - Dale Hensley
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Stephen Jesse
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
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11
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Dyck O, Lupini AR, Yoon M, Jesse S. E-beam Patterning of Atoms in Graphene. Microsc Microanal 2023; 29:1368-1369. [PMID: 37613717 DOI: 10.1093/micmic/ozad067.703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Ondrej Dyck
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Andrew R Lupini
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Stephen Jesse
- Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN, USA
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12
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Oxley MP, Lou W, Yoon M, Chi M. Using Realistic Valence Electron Wave Functions in 4D-STEM Simulations. Microsc Microanal 2023; 29:743-744. [PMID: 37613452 DOI: 10.1093/micmic/ozad067.366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Mark P Oxley
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Wei Lou
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - M Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - M Chi
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
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13
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Kim J, Jung H, Yoon M. Relationship between plasma dopamine concentration and temperament in horses. Domest Anim Endocrinol 2023; 83:106788. [PMID: 37087888 DOI: 10.1016/j.domaniend.2023.106788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 03/19/2023] [Accepted: 03/20/2023] [Indexed: 04/07/2023]
Abstract
Dopamine (DA) is a neurotransmitter associated with animal behaviors. Along with other neurotransmitters such as oxytocin (OXT) and serotonin (5-HT), DA is also involved in determining the temperament of animals. However, the involvement of DA in horse temperament has not been well elucidated. Therefore, in this study, we aimed to determine the correlation between plasma DA concentration and OXT and 5-HT concentrations and behavioral temperament (eg, docility and friendliness, fearfulness, dominance, and trainability) of horses. Blood samples were collected from 31 horses and the concentrations of DA, OXT, and 5-HT were measured using enzyme-linked immunosorbent assay. The temperament of horses was assessed and scored by 3 researchers. The correlation between the plasma concentration of DA and OXT or 5-HT was statistically analyzed using SPSS software and linear regression analysis was performed to determine the association between DA concentration and OXT and 5-HT concentrations. Meanwhile, the DA concentration associated with each type of temperament was analyzed via one-way analysis of variance with LSD post hoc analysis as well as Student's t-test (for trainability). Plasma DA concentration was not found to be correlated with either OXT or 5-HT concentrations. Furthermore, we found no correlation between plasma DA concentration and dominance and trainability. However, our results suggest the possibility of predicting the degree of fearfulness of horses using plasma DA concentrations. We conclude that plasma DA concentration has a potentiality to be used as a biomarker to predict the fearfulness of horses.
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Affiliation(s)
- J Kim
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju, 37224, Republic of Korea
| | - H Jung
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju, 37224, Republic of Korea
| | - M Yoon
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju, 37224, Republic of Korea; Department of Horse, Companion and Wild Animal Science, Kyungpook National University, Sangju, 37224, Republic of Korea; Research Center for Horse Industry, Kyungpook National University, Sangju, 37224, Republic of Korea.
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14
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Oh J, Yoon M, Lee SH, Lee CJ, Park S, Lee SH, Kang SM. Genetic analysis of Korean non-ischemic dilated cardiomyopathy using next generation sequencing. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Non-ischemic dilated cardiomyopathy (NIDCM) is a genetic disorder that causes heart failure and life-threatening arrhythmia. However, there has been no study about the up-to-date genetic analysis for NIDCM in Korean. Therefore, we performed the genetic analysis of Korean NIDCM patients (pts) using next generation sequencing (NGS).
Methods
We analyzed clinical and echocardiographic data of 203 NIDCM in a single center from July 2017 to May 2020. All pts underwent NGS analysis with customized panel including 369 genes. Genetic variants were classified as pathogenic, likely pathogenic mutations or variants of uncertain significance regarding American College of Medical Genetics guideline.
Results
A total of 203 NIDCM pts (57±15 years old, 32.0% male, LVEF 28%) had NGS analysis. Thirty-seven (18.2%) pts had pathogenic or likely pathogenic mutations. The most prevalent mutated genes were TTN (n=16, 43.2%). TNNT2 (n=6, 16.2%), MYBPC3 (n=6, 16.2%) and MYH7 (n=3, 8.1%) mutated genes were common in the following order. The patients with positive panel mutation had no significant difference in initial LVEF (27% vs. 28%, p=0.216) and prevalence of atrial fibrillation (37.8% vs. 44.6%, p=0.454) compared with patients with negative panel mutation. During the median follow-up period of 40 months, there was no significant difference in composite outcome (all-cause death, heart transplantation, LVAD, heart failure re-admission, fatal arrhythmia) (35.3% vs. 32.2%, p=0.729) or presence of improved EF (≥10 points increase from baseline LVEF, and a second measurement of LVEF >40%) (41.2% vs. 50.0%, p=0.354) between the two groups.
Conclusion
This is the first study of NGS analysis in Korean NIDCM pts. We could find disease-related pathogenic or likely pathogenic mutations in 18.2% NIDCM patients. Further prospective, large study should be warranted to elucidate the effect of genetic mutation in clinical manifestation and prognosis of NIDCM in Korean population.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- J Oh
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
| | - M Yoon
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
| | - S H Lee
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
| | - C J Lee
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
| | - S Park
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
| | - S H Lee
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
| | - S M Kang
- Yonsei University College of Medicine, Cardiology Division , Seoul , Korea (Republic of)
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15
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Jin U, Lee CJ, Yoon M, Ha J, Oh J, Park S, Lee SH, Kang SM. The association between frailty and physical performance in elderly patients with heart failure. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.1062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Frailty is known to be an important prognostic indicator in heart failure (HF). The Korean version of the frail scale for Koreans (K-FRAIL) has been developed and verified. The purpose of this study is to analyze the relationship between the K-FRAIL scale and physical performance, including muscular fitness and aerobic capacity in patients with HF.
Methods
This study included 143 HF patients aged over 65 years from a single tertiary hospital. In these subjects, muscular fitness was assessed using the handgrip test and knee extensor strength measurement, and aerobic capacity was assessed by cardiopulmonary exercise test and 6-minute walk test. Frailty status was measured using the K-FRAIL questionnaire and was classified as robust (K-FRAIL scale: 0), prefrail (1–2), and frail (3–5).
Results
Mean age of participants with robust (N=37), prefrail (N=75), and frail (N=31) were 72.5, 73.5, and 76.3 years, respectively. There was no difference in sex and left ventricular ejection fraction (LVEF) among groups, but the estimated glomerular filtration rate (eGFR) was significantly lower as frailty status increased (75.6±17.2 vs. 70.0±20.5 vs. 56.1±23.7 mL/min/1.73 m2; P<0.001). Hand-grip strength and knee extensor muscle strength did not differ among groups. However, peak oxygen consumption (peak VO2; 22.8±5.0 vs. 19.3±4.6 vs. 16.9±4.7 mL/kg/min, P<0.001) and 6-min walk distance (458.4±68.2 vs. 404.5±92.3 vs. 311.2±120.5 m; p<0.001) significantly decreased according to frailty severity. In multivariate regression analysis adjusted for age, sex, haemoglobin, eGFR and LVEF, peak VO2 (β=−0.311; P=0.002) and 6-min walk distance (β=−0.384; P<0.001) showed a significant inverse association with the K-FRAIL scale. With the cut-off value from receiver-operating characteristic curve analysis, peak VO2 (hazard ratio, 5.08; p=0.023) and 6MWT (hazard ratio, 3.99; p=0.020) were independent predictor of frailty according to K-FRAIL scale.
Conclusion
In elderly HF patients, physical performance differs according to frailty status, peak VO2 and 6-min walk distance correlates with the K-FRAIL scale better than muscular fitness.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- U Jin
- Ajou University School of Medicine, Department of Cardiology , Suwon , Korea (Republic of)
| | - C J Lee
- Yonsei University College of Medicine, Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute , Seoul , Korea (Republic of)
| | - M Yoon
- Seoul National University Bundang Hospital, Department of Cardiology , Seongnam , Korea (Republic of)
| | - J Ha
- Yonsei University College of Medicine, Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute , Seoul , Korea (Republic of)
| | - J Oh
- Yonsei University College of Medicine, Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute , Seoul , Korea (Republic of)
| | - S Park
- Yonsei University College of Medicine, Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute , Seoul , Korea (Republic of)
| | - S H Lee
- Yonsei University College of Medicine, Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute , Seoul , Korea (Republic of)
| | - S M Kang
- Yonsei University College of Medicine, Division of Cardiology, Severance Cardiovascular Hospital and Cardiovascular Research Institute , Seoul , Korea (Republic of)
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16
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Gu Y, Zhang L, Cai H, Liang L, Liu C, Hoffman A, Yu Y, Houston A, Puretzky AA, Duscher G, Rack PD, Rouleau CM, Meng X, Yoon M, Geohegan DB, Xiao K. Stabilized Synthesis of 2D Verbeekite: Monoclinic PdSe 2 Crystals with High Mobility and In-Plane Optical and Electrical Anisotropy. ACS Nano 2022; 16:13900-13910. [PMID: 35775975 DOI: 10.1021/acsnano.2c02711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
PdSe2 has a layered structure with an unusual, puckered Cairo pentagonal tiling. Its atomic bond configuration features planar 4-fold-coordinated Pd atoms and intralayer Se-Se bonds that enable polymorphic phases with distinct electronic and quantum properties, especially when atomically thin. PdSe2 is conventionally orthorhombic, and direct synthesis of its metastable polymorphic phases is still a challenge. Here, we report an ambient-pressure chemical vapor deposition approach to synthesize metastable monoclinic PdSe2. Monoclinic PdSe2 is shown to be synthesized selectively under Se-deficient conditions that induce Se vacancies. These defects are shown by first-principles density functional theory calculations to reduce the free energy of the metastable monoclinic phase, thereby stabilizing it during synthesis. The structure and composition of the monoclinic PdSe2 crystals are identified and characterized by scanning transmission electron microscopy imaging, convergent beam electron diffraction, and electron energy loss spectroscopy. Polarized Raman spectroscopy of the monoclinic PdSe2 flakes reveals their strong in-plane optical anisotropy. Electrical transport measurements show that the monoclinic PdSe2 exhibits n-type charge carrier conduction with electron mobilities up to ∼298 cm2 V-1 s-1 and a strong in-plane electron mobility anisotropy of ∼1.9. The defect-mediated growth pathway identified in this work is promising for phase-selective direct synthesis of other 2D transition metal dichalcogenides.
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Affiliation(s)
- Yiyi Gu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lizhi Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology of China, Beijing 100190, China
| | - Hui Cai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Liangbo Liang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Chenze Liu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Anna Hoffman
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Yiling Yu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Austin Houston
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Philip D Rack
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Christopher M Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Xiangmin Meng
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mina Yoon
- Materials Sciences and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - David B Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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17
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Park S, Kwon YK, Yoon M, Park C. Role of Sr doping and external strain on relieving bottleneck of oxygen diffusion in La 2-xSr xCuO 4-δ. Sci Rep 2022; 12:13378. [PMID: 35927286 PMCID: PMC9352678 DOI: 10.1038/s41598-022-17376-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 07/25/2022] [Indexed: 11/09/2022] Open
Abstract
In many complex oxides, the oxygen vacancy formation is a promising route to modify the material properties such as a superconductivity and an oxygen diffusivity. Cation substitutions and external strain have been utilized to control the concentration and diffusion of oxygen vacancies, but the mechanisms behind the controls are not fully understood. Using first-principles calculations, we find how Sr doping and external strain greatly enhances the diffusivity of oxygen vacancies in La2−xSrxCuO4−δ (LSCO) in the atomic level. In hole-doped case (2x > δ), the formation energy of an apical vacancy in the LaO layer is larger than its equatorial counterpart by 0.2 eV that the bottleneck of diffusion process is for oxygen vacancies to escape equatorial sites. Such an energy difference can be reduced and even reversed by either small strain (< 1.5%) or short-range attraction between Sr and oxygen vacancy, and in turn, the oxygen diffusivity is greatly enhanced. For fully compensated hole case (2x ≦ δ), the formation energy of an apical vacancy becomes too high that most oxygen vacancies cannot move but would be trapped at equatorial sites. From our electronic structure analysis, we found that the contrasting change in the formation energy by Sr doping and external strain is originated from the different localization natures of electron carrier from both types of oxygen vacancies.
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Affiliation(s)
- Sohee Park
- Department of Information Display, Kyung Hee University, Seoul, 02447, Korea
| | - Young-Kyun Kwon
- Department of Information Display, Kyung Hee University, Seoul, 02447, Korea.,Department of Physics and Research Institute for Basic Sciences, Kyung Hee University, Seoul, 02447, Korea
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Changwon Park
- School of Computational Sciences, Korea Institute for Advanced Study, Seoul, 130-722, Korea.
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18
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Pilania G, Goldsmith BR, Yoon M, Dongare AM. Recent advances in computational materials design: methods, applications, algorithms, and informatics. J Mater Sci 2022; 57:10471-10474. [PMID: 35730046 PMCID: PMC9188418 DOI: 10.1007/s10853-022-07316-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- Ghanshyam Pilania
- Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545 USA
| | - Bryan R. Goldsmith
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109 USA
| | - Mina Yoon
- Center for Nanophase Materials Sciences and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
| | - Avinash M. Dongare
- Department of Materials Science and Engineering, and Institute of Materials Science, University of Connecticut, Storrs, CT 06269 USA
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19
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Park C, Yoon M. Topography inversion in scanning tunneling microscopy of single-atom-thick materials from penetrating substrate states. Sci Rep 2022; 12:7321. [PMID: 35513468 PMCID: PMC9072348 DOI: 10.1038/s41598-022-10870-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 04/12/2022] [Indexed: 11/21/2022] Open
Abstract
Scanning tunneling microscopy (STM) is one of the indispensable tools to characterize surface structures, but the distinction between atomic geometry and electronic effects based on the measured tunneling current is not always straightforward. In particular, for single-atomic-thick materials (graphene or boron nitride) on metallic substrates, counterintuitive phenomena such as a larger tunneling current for insulators than for metal and a topography opposite to the atomic geometry are reported. Using first-principles density functional theory calculations combined with analytical modeling, we reveal the critical role of penetrating states of metallic substrates that surpass 2D material states, hindering the measurement of intrinsic 2D materials states and leading to topography inversion. Our finding should be instrumental in the interpretation of STM topographies of atomic-thick materials and in the development of 2D material for (opto)electronic and various quantum applications.
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Affiliation(s)
- Changwon Park
- School of Computational Sciences, Korea Institute for Advanced Study, Hoegiro 85, Seoul, 02455, Republic of Korea.
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
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20
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Ko W, Gai Z, Puretzky AA, Liang L, Berlijn T, Hachtel JA, Xiao K, Ganesh P, Yoon M, Li AP. Understanding Heterogeneities in Quantum Materials. Adv Mater 2022:e2106909. [PMID: 35170112 DOI: 10.1002/adma.202106909] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 02/08/2022] [Indexed: 06/14/2023]
Abstract
Quantum materials are usually heterogeneous, with structural defects, impurities, surfaces, edges, interfaces, and disorder. These heterogeneities are sometimes viewed as liabilities within conventional systems; however, their electronic and magnetic structures often define and affect the quantum phenomena such as coherence, interaction, entanglement, and topological effects in the host system. Therefore, a critical need is to understand the roles of heterogeneities in order to endow materials with new quantum functions for energy and quantum information science applications. In this article, several representative examples are reviewed on the recent progress in connecting the heterogeneities to the quantum behaviors of real materials. Specifically, three intertwined topic areas are assessed: i) Reveal the structural, electronic, magnetic, vibrational, and optical degrees of freedom of heterogeneities. ii) Understand the effect of heterogeneities on the behaviors of quantum states in host material systems. iii) Control heterogeneities for new quantum functions. This progress is achieved by establishing the atomistic-level structure-property relationships associated with heterogeneities in quantum materials. The understanding of the interactions between electronic, magnetic, photonic, and vibrational states of heterogeneities enables the design of new quantum materials, including topological matter and quantum light emitters based on heterogenous 2D materials.
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Affiliation(s)
- Wonhee Ko
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Zheng Gai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Liangbo Liang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Tom Berlijn
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Jordan A Hachtel
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Panchapakesan Ganesh
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Mina Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - An-Ping Li
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
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21
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Wang K, Zhang L, Nguyen GD, Sang X, Liu C, Yu Y, Ko W, Unocic RR, Puretzky AA, Rouleau CM, Geohegan DB, Fu L, Duscher G, Li AP, Yoon M, Xiao K. Selective Antisite Defect Formation in WS 2 Monolayers via Reactive Growth on Dilute W-Au Alloy Substrates. Adv Mater 2022; 34:e2106674. [PMID: 34738669 DOI: 10.1002/adma.202106674] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/20/2021] [Indexed: 06/13/2023]
Abstract
Defects are ubiquitous in 2D materials and can affect the structure and properties of the materials and also introduce new functionalities. Methods to adjust the structure and density of defects during bottom-up synthesis are required to control the growth of 2D materials with tailored optical and electronic properties. Here, the authors present an Au-assisted chemical vapor deposition approach to selectively form SW and S2W antisite defects, whereby one or two sulfur atoms substitute for a tungsten atom in WS2 monolayers. Guided by first-principles calculations, they describe a new method that can maintain tungsten-poor growth conditions relative to sulfur via the low solubility of W atoms in a gold/W alloy, thereby significantly reducing the formation energy of the antisite defects during the growth of WS2 . The atomic structure and composition of the antisite defects are unambiguously identified by Z-contrast scanning transmission electron microscopy and electron energy-loss spectroscopy, and their total concentration is statistically determined, with levels up to ≈5.0%. Scanning tunneling microscopy/spectroscopy measurements and first-principles calculations further verified these antisite defects and revealed the localized defect states in the bandgap of WS2 monolayers. This bottom-up synthesis method to form antisite defects should apply in the synthesis of other 2D materials.
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Affiliation(s)
- Kai Wang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Lizhi Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37916, USA
| | - Giang D Nguyen
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Xiahan Sang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China
- Nanostructure Research Centre, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China
| | - Chenze Liu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yiling Yu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Wonhee Ko
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Raymond R Unocic
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Christopher M Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - David B Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Lei Fu
- College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072, China
| | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37916, USA
| | - An-Ping Li
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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22
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Roccapriore KM, Zou Q, Zhang L, Xue R, Yan J, Ziatdinov M, Fu M, Mandrus DG, Yoon M, Sumpter BG, Gai Z, Kalinin SV. Revealing the Chemical Bonding in Adatom Arrays via Machine Learning of Hyperspectral Scanning Tunneling Spectroscopy Data. ACS Nano 2021; 15:11806-11816. [PMID: 34181383 DOI: 10.1021/acsnano.1c02902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The adatom arrays on surfaces offer an ideal playground to explore the mechanisms of chemical bonding via changes in the local electronic tunneling spectra. While this information is readily available in hyperspectral scanning tunneling spectroscopy data, its analysis has been considerably impeded by a lack of suitable analytical tools. Here we develop a machine learning based workflow combining supervised feature identification in the spatial domain and unsupervised clustering in the energy domain to reveal the details of structure-dependent changes of the electronic structure in adatom arrays on the Co3Sn2S2 cleaved surface. This approach, in combination with first-principles calculations, provides insight for using artificial neural networks to detect adatoms and classifies each based on their local neighborhood comprised of other adatoms. These structurally classified adatoms are further spectrally deconvolved. The unexpected inhomogeneity of electronic structures among adatoms in similar configurations is unveiled using this method, suggesting there is not a single atomic species of adatoms, but rather multiple types of adatoms on the Co3Sn2S2 surface. This is further supported by a slight contrast difference in the images (or slight size variation) of the topography of the adatoms.
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Affiliation(s)
- Kevin M Roccapriore
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Qiang Zou
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Lizhi Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Rui Xue
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Jiaqiang Yan
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Maxim Ziatdinov
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mingming Fu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - David G Mandrus
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zheng Gai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Sergei V Kalinin
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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23
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Liu C, Lin YC, Yoon M, Yu Y, Puretzky AA, Rouleau CM, Chisholm MF, Xiao K, Eres G, Duscher G, Geohegan DB. Understanding Substrate-Guided Assembly in van der Waals Epitaxy by in Situ Laser Crystallization within a Transmission Electron Microscope. ACS Nano 2021; 15:8638-8652. [PMID: 33929816 DOI: 10.1021/acsnano.1c00571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Understanding the bottom-up synthesis of atomically thin two-dimensional (2D) crystals and heterostructures is important for the development of new processing strategies to assemble 2D heterostructures with desired functional properties. Here, we utilize in situ laser-heating within a transmission electron microscope (TEM) to understand the stages of crystallization and coalescence of amorphous precursors deposited by pulsed laser deposition (PLD) as they are guided by 2D crystalline substrates into van der Waals (vdW) epitaxial heterostructures. Amorphous clusters of tungsten selenide were deposited by PLD at room temperature onto graphene or MoSe2 monolayer crystals that were suspended on TEM grids. The precursors were then stepwise evolved into 2D heterostructures with pulsed laser heating treatments within the TEM. The lattice-matching provided by the MoSe2 substrate is shown to guide the formation of large-domain, heteroepitaxial vdW WSe2/MoSe2 bilayers both during the crystallization process via direct templating and after crystallization by assisting the coalescence of nanosized domains through nonclassical particle attachment processes including domain rotation and grain boundary migration. The favorable energetics for domain rotation induced by lattice matching with the substrate were understood from first-principles calculations. These in situ TEM studies of pulsed laser-driven nonequilibrium crystallization phenomena represent a transformational tool for the rapid exploration of synthesis and processing pathways that may occur on extremely different length and time scales and lend insight into the growth of 2D crystals by PLD and laser crystallization.
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Affiliation(s)
- Chenze Liu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yu-Chuan Lin
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yiling Yu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Christopher M Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Matthew F Chisholm
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gyula Eres
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - David B Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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24
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Hwang T, Yoon M, Kim M, Kim I, Yu H, Kim T, Uhm J, Kim J, Joung B, Lee M, Pak H. Clinical and electrophysiological characteristics of extra-pulmonary vein triggers in patients who underwent catheter ablation for atrial fibrillation. Europace 2021. [DOI: 10.1093/europace/euab116.207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Extra-pulmonary vein (PV) triggers play significant roles in atrial fibrillation (AF) recurrence after AF catheter ablation (AFCA).
Purpose
We explore the clinical and electrophysiological characteristics of extra-PV triggers in de novo and repeat-AFCA procedure.
Methods
We included 2,151 patients who had de novo AFCA and 319 repeat AFCA (female 28.0%, 59.1 ± 10.8 years old, paroxysmal AF 65.1%) those underwent post-procedural isoproterenol (ISO) provocation tests. We analysed the clinical, electrophysiological, and procedure-related factors associated with extra-PV triggers.
Results
Extra-PV triggers were documented in 11.9% (1.19 ± 0.42 foci) after de novo-AFCA and 27.0% (1.37 ± 0.65 foci) after repeat-AFCA (p = 0.004). LA volume index (OR 1.02 [1.01-1.03], p = 0.004), history of vascular disease (OR 0.55[0.31-0.91], p = 0.028) and Lead I amplitude of electrocardiogram (OR <0.01 [<0.01-0.62], p = 0.032) were independently associated with the existence of extra-PV triggers in de-novo procedure. Women (OR 1.84 [1.03-3.25], p = 0.037) and LA appendage volume (OR 1.04 [1.01-1.07] p = 0.027) were independently associated with extra-PV triggers during the redo-mapping procedure. Septum (28.4%), coronary sinus (24.0%), and superior vena cava (19.6%) were common extra-PV foci, and septal foci were more commonly found in repeat mapping (38.4% vs. 25.0%, p = 0.025). Among 65 patients who showed extra-PV at the repeat procedures, 19 (29.2%) matched with previous focal or empirical extra-PV ablation sites and 9 (13.8%) were multiple or unmappable sites. AF recurrence rates were significantly higher in both patients with extra-PV triggers after de novo procedures (Log-rank P <0.001; HR 1.93 [1.58-2.36], p= <0.001) and repeat procedures (Log-rank P <0.001, HR 1.87 [1.29-2.70], p= <0.001).
Conclusion
ISO provoked extra-PV triggers commonly found in AF patients with significant remodelling and previous empirical or focal extra-PV ablations. Existence of extra-PV triggers were independently associated with poorer rhythm outcome after both de novo and repeat AFCA. Denovo AF ablation outcome OverallExtra-PV triggers (-)Extra-PV triggers (+)p-value(n = 2151)(n = 1895)(n = 256)Age, yrs58.98 ± 10.9558.73 ± 11.0360.76 ± 10.200.006Male, (%)1550 ( 72.1)1389 ( 73.3)161 ( 62.9)0.001Follow up duration, month50.30 (37.71)51.65 (37.95)40.71 (34.58)<0.001Early recurrence (%)579 ( 27.8)455 ( 24.9)124 ( 48.4)<0.001Clinical recurrence (%)699 ( 33.6)584 ( 32.0)115 ( 44.9)<0.001Abstract Figure. AF free survival according to Extra PVT
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Affiliation(s)
- T Hwang
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - M Yoon
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - M Kim
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - I Kim
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - H Yu
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - T Kim
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - J Uhm
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - J Kim
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - B Joung
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - M Lee
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
| | - H Pak
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea (Republic of)
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Kim S, Kim E, Yoon M. 74 Comparison between timothy hay and Italian ryegrass haylage for the main grass feed for the maintenance horses. J Equine Vet Sci 2021. [DOI: 10.1016/j.jevs.2021.103537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Yu Y, Jung GS, Liu C, Lin YC, Rouleau CM, Yoon M, Eres G, Duscher G, Xiao K, Irle S, Puretzky AA, Geohegan DB. Strain-Induced Growth of Twisted Bilayers during the Coalescence of Monolayer MoS 2 Crystals. ACS Nano 2021; 15:4504-4517. [PMID: 33651582 DOI: 10.1021/acsnano.0c08516] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Tailoring the grain boundaries (GBs) and twist angles between two-dimensional (2D) crystals are two crucial synthetic challenges to deterministically enable envisioned applications such as moiré excitons, emerging magnetism, or single-photon emission. Here, we reveal how twisted 2D bilayers can be synthesized from the collision and coalescence of two growing monolayer MoS2 crystals during chemical vapor deposition. The twisted bilayer (TB) moiré angles are found to preserve the misorientation angle (θ) of the colliding crystals. The shapes of the TB regions are rationalized by a kink propagation model that predicts the GB formed by the coalescing crystals. Optical spectroscopy measurements reveal a θ-dependent long-range strain in crystals with stitched grain boundaries and a sharp (θ > 20°) threshold for the appearance of TBs, which relieves this strain. Reactive molecular dynamics simulations explain this strain from the continued growth of the crystals during coalescence due to the insertion of atoms at unsaturated defects along the GB, a process that self-terminates when the defects become saturated. The simulations also reproduce atomic-resolution electron microscopy observations of faceting along the GB, which is shown to arise from the growth-induced long-range strain. These facets align with the axes of the colliding crystals to provide favorable nucleation sites for second-layer growth of a TB with twist angles that preserve the misorientation angle θ. This interplay between strain generation and aligned nucleation provides a synthetic pathway for the growth of TBs with deterministic angles.
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Affiliation(s)
- Yiling Yu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gang Seob Jung
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Chenze Liu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Yu-Chuan Lin
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Christopher M Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gyula Eres
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Stephan Irle
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - David B Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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27
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Choi Y, Yoon M. The expression of androstenone receptor (OR7D4) in vomeronasal organ and olfactory epithelium of horses. Domest Anim Endocrinol 2021; 74:106535. [PMID: 32896801 DOI: 10.1016/j.domaniend.2020.106535] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 07/10/2020] [Accepted: 08/03/2020] [Indexed: 01/19/2023]
Abstract
Androstenone is the first mammalian steroidal pheromone to be identified. Pheromones are chemicals that animals use to communicate within a species. Pheromone detections are related to vomeronasal organ (VNO) and olfactory epithelium (OE) in mammals. Olfactory Receptor Family 7 Subfamily D Member 4 (OR7D4) is an odorant receptor that responds to androstenone. Several studies indicated that spray with androstenone changes behaviors of the boar and dogs. However, the expression of OR7D4 in VNO and OE was not reported in mammals except human. Thus, the main objectives of this study were to investigate the expression of OR7D4 in VNO and OE of horses. Tissue samples were collected from the VNO and nasal cavity of 6 thoroughbred horses. The presence of OR7D4 gene was investigated with reverse transcription-polymerase chain reaction. The expression of OR7D4 was determined using Western blot and immunofluorescence. As a result, the bands for OR7D4 were observed at approximately 462 bp. The protein band of OR7D4 of VNO and OE was detected at 38 kDa. Immunofluorescence result showed that the cilia and cytoplasm of olfactory receptor cells of VNO and nasal cavity tissues were immunolabeled with OR7D4 antibody. The intensity of OR7D4 protein bands in the ventral region of the ethmoidal concha tissues was not significantly different between mares and geldings. In conclusion, thoroughbred horses are capable of androstenone perception through OR7D4 expressed in the VNO and OE.
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Affiliation(s)
- Y Choi
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju 37224, Korea
| | - M Yoon
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju 37224, Korea; Department of Horse, Companion and Wild Animal Science, Kyungpook National University, Sangju 37224, Korea.
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Abstract
Endocrine, paracrine, and autocrine factors orchestrate the development and physiology of the stallion reproductive system. Oxytocin (OXT) is one of the critical endocrine, paracrine, and autocrine factors for the male reproductive system. Previous studies have investigated OXT receptor (OXTR) expression in testes and epididymides, including humans, marmosets, macaques, swine, and sheep. This study aimed to explore (1) OXTR localization in the testes and epididymides and (2) the seasonal modification of OXTR expression in the testes. Adult stallion testis and epididymis samples were prepared using routine castration procedures. Reverse-transcription PCR was performed to detect the presence of OXTR messenger RNA (mRNA) in the testes. Western blot procedure was performed to confirm the cross-reactivity of OXTR antibody to horse OXTR. Immunohistochemistry was performed to detect OXTR protein expression in the testes and epididymides. Oxytocin receptor mRNA was detected in the stallion testes. The OXTR protein band was observed at 55 kDa. Interestingly, the relative intensity of the OXTR protein band varied between nonbreeding and breeding season. The OXTR protein level in the testes collected during the breeding season was higher than that during the nonbreeding season. Oxytocin receptor localization was observed in the cytoplasm of Type A spermatogonia and spermatid. Oxytocin receptor protein expression was also observed in the cytoplasmic area of Leydig cells and the membrane of the seminiferous tubules. The cytoplasm of principal and basal cells in the caput, corpus, and cauda was also immunolabeled with OXTR antibody. In conclusion, based on the expression of OXTR in tissues of testes and epididymides, OXT-OXTR system may be a critical factor for stallion testicular and epididymal function. In addition, according to the seasonal alteration of intensity, the OXT-OXTR system may be associated with seasonal changes in the reproductive system in stallions.
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Affiliation(s)
- Y Jung
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju 37224, Republic of Korea
| | - M Yoon
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju 37224, Republic of Korea; Department of Horse, Companion and Wild Animal Science, Kyungpook National University, Sangju 37224, Republic of Korea.
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Lee JW, Tan S, Han TH, Wang R, Zhang L, Park C, Yoon M, Choi C, Xu M, Liao ME, Lee SJ, Nuryyeva S, Zhu C, Huynh K, Goorsky MS, Huang Y, Pan X, Yang Y. Author Correction: Solid-phase hetero epitaxial growth of α-phase formamidinium perovskite. Nat Commun 2020; 11:5880. [PMID: 33184274 PMCID: PMC7661531 DOI: 10.1038/s41467-020-19846-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Affiliation(s)
- Jin-Wook Lee
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA. .,Department of Nanoengineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea.
| | - Shaun Tan
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Tae-Hee Han
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.,Division of Materials Science and Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Rui Wang
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Lizhi Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
| | - Changwon Park
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Chungseok Choi
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Mingjie Xu
- Department of Materials Science and Engineering, Irvine Materials Research Institute, University of California, Irvine, CA, 92697, USA
| | - Michael E Liao
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Sung-Joon Lee
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Selbi Nuryyeva
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Chenhui Zhu
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94704, USA
| | - Kenny Huynh
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Mark S Goorsky
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Yu Huang
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Xiaoqing Pan
- Department of Materials Science and Engineering, Irvine Materials Research Institute, University of California, Irvine, CA, 92697, USA
| | - Yang Yang
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
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30
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Lee JW, Tan S, Han TH, Wang R, Zhang L, Park C, Yoon M, Choi C, Xu M, Liao ME, Lee SJ, Nuryyeva S, Zhu C, Huynh K, Goorsky MS, Huang Y, Pan X, Yang Y. Solid-phase hetero epitaxial growth of α-phase formamidinium perovskite. Nat Commun 2020; 11:5514. [PMID: 33139740 PMCID: PMC7608657 DOI: 10.1038/s41467-020-19237-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 10/01/2020] [Indexed: 12/04/2022] Open
Abstract
Conventional epitaxy of semiconductor films requires a compatible single crystalline substrate and precisely controlled growth conditions, which limit the price competitiveness and versatility of the process. We demonstrate substrate-tolerant nano-heteroepitaxy (NHE) of high-quality formamidinium-lead-tri-iodide (FAPbI3) perovskite films. The layered perovskite templates the solid-state phase conversion of FAPbI3 from its hexagonal non-perovskite phase to the cubic perovskite polymorph, where the growth kinetics are controlled by a synergistic effect between strain and entropy. The slow heteroepitaxial crystal growth enlarged the perovskite crystals by 10-fold with a reduced defect density and strong preferred orientation. This NHE is readily applicable to various substrates used for devices. The proof-of-concept solar cell and light-emitting diode devices based on the NHE-FAPbI3 showed efficiencies and stabilities superior to those of devices fabricated without NHE. Though literature reports metal halide perovskite epitaxial growth on various substrates, controlling film growth for device applications remains a challenge. Here, the authors report kinetic-controlled growth of halide perovskite thin films on various substrates via layered perovskite templates.
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Affiliation(s)
- Jin-Wook Lee
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA. .,Department of Nanoengineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 16419, Republic of Korea.
| | - Shaun Tan
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Tae-Hee Han
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.,Division of Materials Science and Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Rui Wang
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Lizhi Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
| | - Changwon Park
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Chungseok Choi
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Mingjie Xu
- Department of Materials Science and Engineering, Irvine Materials Research Institute, University of California, Irvine, CA, 92697, USA
| | - Michael E Liao
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Sung-Joon Lee
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Selbi Nuryyeva
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Chenhui Zhu
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94704, USA
| | - Kenny Huynh
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Mark S Goorsky
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Yu Huang
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
| | - Xiaoqing Pan
- Department of Materials Science and Engineering, Irvine Materials Research Institute, University of California, Irvine, CA, 92697, USA
| | - Yang Yang
- Department of Materials Science and Engineering, California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA.
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31
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Jang G, Yoon M, Lee J, Oh BH, Kim J, Kim DE, Shin S. Investigation of the damping wiggler effect and application on the PAL fourth-generation storage ring. J Synchrotron Radiat 2020; 27:1510-1517. [PMID: 33147176 DOI: 10.1107/s1600577520011522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 08/22/2020] [Indexed: 06/11/2023]
Abstract
An investigation of the damping wiggler effect to reduce the emittance in the Pohang Accelerator Laboratory (PAL), a fourth-generation storage ring (4GSR) that uses a multi-bend achromat, is presented. A 4GSR lattice which has reduced emittance and increased dynamic aperture to amplify the synergy with two existing light sources (PLS-II and PAL-XFEL) at PAL is described.
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Affiliation(s)
- Gyeongsu Jang
- Department of Physics, POSTECH, Pohang, Gyungbuk 37673, South Korea
| | - M Yoon
- Department of Physics, POSTECH, Pohang, Gyungbuk 37673, South Korea
| | - J Lee
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyungbuk 37673, South Korea
| | - B H Oh
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyungbuk 37673, South Korea
| | - J Kim
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - D E Kim
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyungbuk 37673, South Korea
| | - S Shin
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyungbuk 37673, South Korea
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32
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Zhang L, Park C, Yoon M. Quantum Phase Engineering of Two-Dimensional Post-Transition Metals by Substrates: Toward a Room-Temperature Quantum Anomalous Hall Insulator. Nano Lett 2020; 20:7186-7192. [PMID: 32930599 DOI: 10.1021/acs.nanolett.0c02520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We propose a new strategy to engineer topological and magnetic properties of two-dimensional (2D) hexagonal lattices consisting of post-transition metals. Our first-principles calculations demonstrate that substrates serve as templates to form 2D lattices with high thermodynamic stability, where their topological properties as well as magnetic properties sensitively change as a function of lattice constants, i.e., the system undergoes a first-order phase transition from nonmagnetic to ferromagnetic state above a critical lattice constant. Consequently, substrates can be used to explore versatile magnetic, electronic, and quantum topological properties. We establish phase diagrams of versatile quantum phases in terms of exchange coupling and spin-orbit coupling effectively tuned by the lattice constants. We further reveal the first room-temperature quantum anomalous Hall (QAH) effect, i.e., Sn on 2√3 × 2√3 graphane is a QAH insulator with a large spin-orbit coupling gap of ∼0.2 eV and a Curie temperature of ∼380 K by using the 2D anisotropic Heisenberg model.
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Affiliation(s)
- Lizhi Zhang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Changwon Park
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, United States
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33
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Clewell HJ, Campbell JL, Van Landingham C, Franzen A, Yoon M, Dodd DE, Andersen ME, Gentry PR. Response to "letter concerning: Clewell (2019) incorporation of in vitro metabolism data and physiologically based pharmacokinetic modeling in a risk assessment for chloroprene." (UIHT-2020-0053). Inhal Toxicol 2020; 32:369-371. [PMID: 32900235 DOI: 10.1080/08958378.2020.1817199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- H J Clewell
- Research Triangle Park, Ramboll US Corporation, Charlotte, North Carolina, USA
| | - J L Campbell
- Research Triangle Park, Ramboll US Corporation, Charlotte, North Carolina, USA
| | | | - A Franzen
- Ramboll US Corporation, Monroe, Louisiana, USA
| | - M Yoon
- ToxStrategies, Inc., Cary, North Carolina, USA
| | - D E Dodd
- Research Triangle Park, The Hamner Institutes for Health Sciences, North Carolina, USA
| | - M E Andersen
- Research Triangle Park, The Hamner Institutes for Health Sciences, North Carolina, USA
| | - P R Gentry
- ToxStrategies, Inc., Cary, North Carolina, USA
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34
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Ny L, Hernberg M, Nyakas M, Koivunen J, Oddershede L, Yoon M, Wang X, Guyot P, Geisler J. BRAF mutational status as a prognostic marker for survival in malignant melanoma: a systematic review and meta-analysis. Acta Oncol 2020; 59:833-844. [PMID: 32285732 DOI: 10.1080/0284186x.2020.1747636] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background: The analysis of the BRAF mutational status has been established as a standard procedure during diagnosis of advanced malignant melanoma due to the fact that BRAF inhibitors constitute a cornerstone in the treatment of metastatic disease. However, the general impact of BRAF mutational status on survival remains unclear. Our study aimed to assess the underlying prognostic significance of BRAF mutant versus wild type (WT) malignant melanoma on overall survival (OS), disease-free survival (DFS) and progression-free survival (PFS).Material and methods: A systematic literature search in EMBASE, Medline and Cochrane CENTRAL was performed. Studies were included if they reported survival outcomes for BRAF mutant versus WT patients as hazard ratios (HR) or in Kaplan-Meier (KM) curves. Random-effects meta-analysis models were used to pool HRs across the studies.Results: Data from 52 studies, representing 7519 patients, were pooled for analysis of OS. The presence of a BRAF mutation was statistically significantly associated with a reduced OS (HR [95% confidence interval (CI)]: 1.23 [1.09-1.38]), however, with substantial heterogeneity between the studies (I2: 58.0%). Meta-regression and sensitivity analyses showed that age, sex and BRAF mutation testing method did not have a significant effect on the OS HR. BRAF mutant melanoma showed comparable effect on DFS to non-BRAF mutant melanoma in stage I-III melanoma (combined HR: 1.16, 95% CI: 0.92-1.46), and on PFS in stage III-IV (HR: 0.98 (95% CI: 0.68-1.40)).Conclusion: Although there was substantial heterogeneity between the studies, the overall results demonstrated a poorer prognosis and OS in patients harbouring BRAF mutations. Future studies should take this into account when evaluating epidemiological data and treatment effects of new interventions in patients with malignant melanoma.
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Affiliation(s)
- L. Ny
- Department of Oncology, Institute of Clinical Science, University of Gothenburg and Sahlgrenska University Hospital, Gothenburg, Sweden
| | - M. Hernberg
- Comprehensive Cancer Center, Helsinki University Hospital, Helsinki, Finland
| | - M. Nyakas
- Oslo University Hospital, Oslo, Norway
| | - J. Koivunen
- Department of Oncology and Radiotherapy, Oulu University Hospital, MRC Oulu, Oulu, Finland
| | | | - M. Yoon
- Novartis Healthcare A/S, Copenhagen, Denmark
| | - X. Wang
- Commercialization & Outcomes, ICON plc, Stockholm, Sweden
| | - P. Guyot
- Commercialization & Outcomes, ICON plc, Lyon, France
| | - J. Geisler
- Institute of Clinical Medicine, Campus AHUS, University of Oslo, Oslo, Norway
- Department of Oncology, Akershus University Hospital, Lørenskog, Norway
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35
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Lin YC, Liu C, Yu Y, Zarkadoula E, Yoon M, Puretzky AA, Liang L, Kong X, Gu Y, Strasser A, Meyer HM, Lorenz M, Chisholm MF, Ivanov IN, Rouleau CM, Duscher G, Xiao K, Geohegan DB. Low Energy Implantation into Transition-Metal Dichalcogenide Monolayers to Form Janus Structures. ACS Nano 2020; 14:3896-3906. [PMID: 32150384 DOI: 10.1021/acsnano.9b10196] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Atomically thin two-dimensional (2D) materials face significant energy barriers for synthesis and processing into functional metastable phases such as Janus structures. Here, the controllable implantation of hyperthermal species from pulsed laser deposition (PLD) plasmas is introduced as a top-down method to compositionally engineer 2D monolayers. The kinetic energies of Se clusters impinging on suspended monolayer WS2 crystals were controlled in the <10 eV/atom range with in situ plasma diagnostics to determine the thresholds for selective top layer replacement of sulfur by selenium for the formation of high quality WSSe Janus monolayers at low (300 °C) temperatures and bottom layer replacement for complete conversion to WSe2. Atomic-resolution electron microscopy and spectroscopy in tilted geometry confirm the WSSe Janus monolayer. Molecular dynamics simulations reveal that Se clusters implant to form disordered metastable alloy regions, which then recrystallize to form highly ordered structures, demonstrating low-energy implantation by PLD for the synthesis of 2D Janus layers and alloys of variable composition.
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Affiliation(s)
- Yu-Chuan Lin
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Chenze Liu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Yiling Yu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Eva Zarkadoula
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Liangbo Liang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Xiangru Kong
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Yiyi Gu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Alex Strasser
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77840, United States
| | - Harry M Meyer
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Matthias Lorenz
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Matthew F Chisholm
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Ilia N Ivanov
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Christopher M Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
| | - David B Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, United States
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36
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Hu X, Zhang D, Chen T, Chen AZ, Holmgren EN, Zhang Q, Pajerowski DM, Yoon M, Xu G, Choi JJ, Lee SH. Crystal structures and rotational dynamics of a two-dimensional metal halide perovskite (OA)2PbI4. J Chem Phys 2020; 152:014703. [DOI: 10.1063/1.5131667] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- Xiao Hu
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Depei Zhang
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Tianran Chen
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Alexander Z. Chen
- Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Eric N. Holmgren
- Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Qiang Zhang
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Daniel M. Pajerowski
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Guangyong Xu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Joshua J. Choi
- Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Seung-Hun Lee
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
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37
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Moon S, Rah J, Yoon M, Shin D. Development of Beam Dosimetry System for Proton Pencil Beam Scanning Using Multi-Layer Acrylic-Disk Radiation Sensor (ADRS). Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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38
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Yoon M, Ring C, Van Landingham CB, Suh M, Song G, Antonijevic T, Gentry PR, Taylor MD, Keene AM, Andersen ME, Clewell HJ. Assessing children's exposure to manganese in drinking water using a PBPK model. Toxicol Appl Pharmacol 2019; 380:114695. [PMID: 31394159 DOI: 10.1016/j.taap.2019.114695] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/20/2019] [Accepted: 07/30/2019] [Indexed: 12/27/2022]
Abstract
A previously published human PBPK model for manganese (Mn) in infants and children has been updated with Mn in drinking water as an additional exposure source. Built upon the ability to capture differences in Mn source-specific regulation of intestinal uptake in nursing infants who are breast-fed and formula-fed, the updated model now describes the bioavailability of Mn from drinking water in children of ages 0-18. The age-related features, including the recommended age-specific Mn dietary intake, age-specific water consumption rates, and age-specific homeostasis of Mn, are based on the available human data and knowledge of the biology of essential-metal homeostasis. Model simulations suggest that the impact of adding drinking-water exposure to daily Mn exposure via dietary intake and ambient air inhalation in children is not greater than the impacts in adults, even at a drinking-water concentration that is 2 times higher than the USEPA's lifetime health advisory value. This conclusion was also valid for formula-fed infants who are considered at the highest potential exposure to Mn from drinking water compared to all other age groups. Our multi-route, multi-source Mn PBPK model for infants and children provides insights about the potential for Mn-related health effects on growing children and will thereby improve the level of confidence in properly interpreting Mn exposure-health effects relationships in children in human epidemiological studies.
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Affiliation(s)
- M Yoon
- ToxStrategies, Inc., RTP, NC, USA.
| | - C Ring
- ToxStrategies, Inc., Austin, TX, USA
| | | | - M Suh
- ToxStrategies, Inc., Orange County, CA, USA
| | - G Song
- ToxStrategies, Inc., Orange County, CA, USA
| | | | | | | | - A M Keene
- Afton Chemical Corporation, Richmond, VA, USA
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39
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Jang GG, Klett JW, McFarlane J, Ievlev A, Xiao K, Keum JK, Yoon M, Im P, Hu MZ, Parks JE. Efficient Solar-Thermal Distillation Desalination Device by Light Absorptive Carbon Composite Porous Foam. Glob Chall 2019; 3:1900003. [PMID: 31565393 PMCID: PMC6686170 DOI: 10.1002/gch2.201900003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Indexed: 05/05/2023]
Abstract
Solar-thermal driven desalination based on porous carbon materials has promise for fresh water production. Exploration of high-efficiency solar desalination devices has not solved issues for practical application, namely complicated fabrication, cost-effectiveness, and scalability. Here, direct solar-thermal carbon distillation (DS-CD) tubular devices are introduced that have a facile fabrication process, are scalable, and use an inexpensive but efficient microporous graphite foam coated with carbon nanoparticle and superhydrophobic materials. The "black" composite foam serving as a solar light absorber heats up salt water effectively to produce fresh water vapor, and the superhydrophobic surface of the foam traps the liquid feed in the device. Two proof-of-principle distillation systems are adopted, i.e., solar still and membrane distillation and the fabricated devices are evaluated for direct solar desalination efficiency. For the solar still, nanoparticle and fluorosilane coatings on the porous surface increase the solar energy absorbance, resulting in a solar-steam generation efficiency of 64% from simulated seawater at 1 sun. The membrane distillation demonstrates excellent vapor production (≈6.6 kg m-2 h-1) with >99.5% salt rejection under simulated 3 sun solar-thermal irradiation. Unlike traditional solar desalination, the adaptable DS-CD can easily be scaled up to larger systems such as high-temperature tubular modules, presenting a promising solution for solar-energy-driven desalination.
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Affiliation(s)
- Gyoung Gug Jang
- Energy and Transportation Science DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - James William Klett
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Joanna McFarlane
- Isotope and Fuel Cycle Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Anton Ievlev
- Center for Nanophase Materials ScienceOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Kai Xiao
- Center for Nanophase Materials ScienceOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Jong K. Keum
- Center for Nanophase Materials ScienceOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Mina Yoon
- Center for Nanophase Materials ScienceOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Piljae Im
- Energy and Transportation Science DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Michael Z. Hu
- Energy and Transportation Science DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - James E. Parks
- Energy and Transportation Science DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
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40
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Wang K, Puretzky AA, Hu Z, Srijanto BR, Li X, Gupta N, Yu H, Tian M, Mahjouri-Samani M, Gao X, Oyedele A, Rouleau CM, Eres G, Yakobson BI, Yoon M, Xiao K, Geohegan DB. Strain tolerance of two-dimensional crystal growth on curved surfaces. Sci Adv 2019; 5:eaav4028. [PMID: 31172023 PMCID: PMC6544449 DOI: 10.1126/sciadv.aav4028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 04/23/2019] [Indexed: 05/26/2023]
Abstract
Two-dimensional (2D) crystal growth over substrate features is fundamentally guided by the Gauss-Bonnet theorem, which mandates that rigid, planar crystals cannot conform to surfaces with nonzero Gaussian curvature. Here, we reveal how topographic curvature of lithographically designed substrate features govern the strain and growth dynamics of triangular WS2 monolayer single crystals. Single crystals grow conformally without strain over deep trenches and other features with zero Gaussian curvature; however, features with nonzero Gaussian curvature can easily impart sufficient strain to initiate grain boundaries and fractured growth in different directions. Within a strain-tolerant regime, however, triangular single crystals can accommodate considerable (<1.1%) localized strain exerted by surface features that shift the bandgap up to 150 meV. Within this regime, the crystal growth accelerates in specific directions, which we describe using a growth model. These results present a previously unexplored strategy to strain-engineer the growth directions and optoelectronic properties of 2D crystals.
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Affiliation(s)
- Kai Wang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Alexander A. Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Zhili Hu
- College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
| | - Bernadeta R. Srijanto
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Xufan Li
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Nitant Gupta
- Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA
| | - Henry Yu
- Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA
| | - Mengkun Tian
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Masoud Mahjouri-Samani
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Xiang Gao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Akinola Oyedele
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Christopher M. Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Gyula Eres
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Boris I. Yakobson
- Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - David B. Geohegan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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41
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Dzierlenga MW, Yoon M, Wania F, Ward PL, Armitage JM, Wood SA, Clewell HJ, Longnecker MP. Quantitative bias analysis of the association of type 2 diabetes mellitus with 2,2',4,4',5,5'-hexachlorobiphenyl (PCB-153). Environ Int 2019; 125:291-299. [PMID: 30735960 DOI: 10.1016/j.envint.2018.12.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
An association between serum concentrations of persistent organic pollutants (POPs), such as 2,2',4,4',5,5'-hexachlorobiphenyl (PCB-153), and risk of type 2 diabetes mellitus (T2DM) has been reported. Conditional on body mass index (BMI) and waist circumference (WC), a higher serum PCB-153 concentration may be a marker of T2DM risk because it reflects other aspects of obesity that are related to T2DM risk and to PCB-153 clearance. To estimate the amount of residual confounding by other aspects of obesity, we performed a quantitative bias analysis on the results of a specific study. A physiologically-based pharmacokinetic (PBPK) model was developed to predict serum levels of PCB-153 for a simulated population. T2DM status was assigned to simulated subjects based on age, sex, BMI, WC, and visceral adipose tissue mass. The distributions of age, BMI, WC, and T2DM prevalence of the simulated population were tailored to closely match the target population. Analysis of the simulated data showed that a small part of the observed association appeared to be due to residual confounding. For example, the predicted odds ratio of T2DM that would have been obtained had the results been adjusted for visceral adipose tissue mass, for the ≥90th percentile of PCB-153 serum concentration, was 6.60 (95% CI 2.46-17.74), compared with an observed odds ratio of 7.13 (95% CI 2.65-19.13). Our results predict that the association between PCB-153 and risk of type 2 diabetes mellitus would not be substantially changed by additional adjustment for visceral adipose tissue mass in epidemiologic analyses. Confirmation of these predictions with longitudinal data would be reassuring.
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Affiliation(s)
| | - M Yoon
- ScitoVation, LLC, Research Triangle Park, NC, USA
| | - F Wania
- University of Toronto Scarborough, Toronto, Ontario, Canada
| | - P L Ward
- Ramboll, Research Triangle Park, NC, USA
| | - J M Armitage
- University of Toronto Scarborough, Toronto, Ontario, Canada
| | - S A Wood
- University of Toronto Scarborough, Toronto, Ontario, Canada
| | - H J Clewell
- ScitoVation, LLC, Research Triangle Park, NC, USA
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Paini A, Leonard J, Joossens E, Bessems J, Desalegn A, Dorne J, Gosling J, Heringa M, Klaric M, Kliment T, Kramer N, Loizou G, Louisse J, Lumen A, Madden J, Patterson E, Proença S, Punt A, Setzer R, Suciu N, Troutman J, Yoon M, Worth A, Tan Y. Next generation physiologically based kinetic (NG-PBK) models in support of regulatory decision making. Comput Toxicol 2019; 9:61-72. [PMID: 31008414 PMCID: PMC6472623 DOI: 10.1016/j.comtox.2018.11.002] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 11/02/2018] [Accepted: 11/08/2018] [Indexed: 02/06/2023]
Abstract
The fields of toxicology and chemical risk assessment seek to reduce, and eventually replace, the use of animals for the prediction of toxicity in humans. In this context, physiologically based kinetic (PBK) modelling based on in vitro and in silico kinetic data has the potential to a play significant role in reducing animal testing, by providing a methodology capable of incorporating in vitro human data to facilitate the development of in vitro to in vivo extrapolation of hazard information. In the present article, we discuss the challenges in: 1) applying PBK modelling to support regulatory decision making under the toxicology and risk-assessment paradigm shift towards animal replacement; 2) constructing PBK models without in vivo animal kinetic data, while relying solely on in vitro or in silico methods for model parameterization; and 3) assessing the validity and credibility of PBK models built largely using non-animal data. The strengths, uncertainties, and limitations of PBK models developed using in vitro or in silico data are discussed in an effort to establish a higher degree of confidence in the application of such models in a regulatory context. The article summarises the outcome of an expert workshop hosted by the European Commission Joint Research Centre (EC-JRC) - European Union Reference Laboratory for Alternatives to Animal Testing (EURL ECVAM), on "Physiologically-Based Kinetic modelling in risk assessment - reaching a whole new level in regulatory decision-making" held in Ispra, Italy, in November 2016, along with results from an international survey conducted in 2017 and recently reported activities occurring within the PBK modelling field. The discussions presented herein highlight the potential applications of next generation (NG)-PBK modelling, based on new data streams.
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Affiliation(s)
- A. Paini
- European Commission Joint Research Centre, Ispra, Italy
| | - J.A. Leonard
- Oak Ridge Institute for Science and Education, 100 ORAU Way, Oak Ridge, TN 37830, USA
| | - E. Joossens
- European Commission Joint Research Centre, Ispra, Italy
| | - J.G.M. Bessems
- European Commission Joint Research Centre, Ispra, Italy
- Flemish Institute for Technological Research (VITO), Mol, Belgium
| | - A. Desalegn
- European Commission Joint Research Centre, Ispra, Italy
| | - J.L. Dorne
- European Food Safety Authority, 1a, Via Carlo Magno, 1A, 43126 Parma PR, Italy
| | - J.P. Gosling
- School of Mathematics, University of Leeds, Leeds, UK
| | - M.B. Heringa
- RIVM - The National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | | | - T. Kliment
- European Commission Joint Research Centre, Ispra, Italy
| | - N.I. Kramer
- Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, 3508TD Utrecht, The Netherlands
| | - G. Loizou
- Health and Safety Executive, Buxton, UK
| | - J. Louisse
- Division of Toxicology, Wageningen University, Tuinlaan 5, 6703 HE Wageningen, The Netherlands
- RIKILT Wageningen University and Research, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands
| | - A. Lumen
- Division of Biochemical Toxicology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
| | - J.C. Madden
- School of Pharmacy and Bimolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK
| | - E.A. Patterson
- School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
| | - S. Proença
- European Commission Joint Research Centre, Ispra, Italy
- Institute for Risk Assessment Sciences, Utrecht University, P.O. Box 80177, 3508TD Utrecht, The Netherlands
| | - A. Punt
- RIKILT Wageningen University and Research, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands
| | - R.W. Setzer
- U.S. Environmental Protection Agency, National Exposure Research Laboratory, 109 TW Alexander Drive, Research Triangle Park, NC 27709, USA
| | - N. Suciu
- DiSTAS, Università Cattolica del Sacro Cuore, Piacenza, Italy
| | - J. Troutman
- Central Product Safety, The Procter & Gamble Company, Cincinnati, OH, USA
| | - M. Yoon
- ScitoVation, 6 Davis Drive, PO Box 110566, Research Triangle Park, NC 27709, USA
- ToxStrategies, Research Triangle Park Office, 1249 Kildaire Farm Road 134, Cary, NC 27511, USA
| | - A. Worth
- European Commission Joint Research Centre, Ispra, Italy
| | - Y.M. Tan
- School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
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Cho S, Son J, Kim H, Jeong J, Lee S, Lim Y, Lee S, Yoon M, Shin D. The Development of New Dosimetry System using an Optic-Disk Radiation Sensor for Pencil Beam Scanning Mode. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.1379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Pendse S, Diallo I, Nicolas C, Efremenko A, Hack C, Housand C, McMullen P, Yoon M, Clewell H. Incorporation of public exposure models into the PLETHEM pharmacokinetic framework. Toxicol Lett 2018. [DOI: 10.1016/j.toxlet.2018.06.1025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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45
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Lee B, Kim H, Jeong S, Jung S, Shin E, Park H, Lim D, Lee J, Chung J, Yoon M, Han Y. EP-1775: The feasibility study of clinical high accuracy QA system for treatment planning using Monte Carlo. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)32084-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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46
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Yarali M, Brahmi H, Yan Z, Li X, Xie L, Chen S, Kumar S, Yoon M, Xiao K, Mavrokefalos A. Effect of Metal Doping and Vacancies on the Thermal Conductivity of Monolayer Molybdenum Diselenide. ACS Appl Mater Interfaces 2018; 10:4921-4928. [PMID: 29322775 DOI: 10.1021/acsami.7b14310] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
It is well understood that defect engineering can give rise to exotic electronic properties in transition-metal dichalcogenides, but to this date, there is no detailed study to illustrate how defects can be engineered to tailor their thermal properties. Here, through combined experimental and theoretical approaches based on the first-principles density functional theory and Boltzmann transport equations, we have explored the effect of lattice vacancies and substitutional tungsten (W) doping on the thermal transport of the suspended molybdenum diselenide (MoSe2) monolayers grown by chemical vapor deposition (CVD). The results show that even though the isoelectronic substitution of the W atoms for Mo atoms in CVD-grown Mo0.82W018Se2 monolayers reduces the Se vacancy concentration by 50% compared to that found in the MoSe2 monolayers, the thermal conductivity remains intact in a wide temperature range. On the other hand, Se vacancies have a detrimental effect for both samples and more so in the Mo0.82W018Se2 monolayers, which results in thermal conductivity reduction up to 72% for a vacancy concentration of 4%. This is because the mass of the W atom is larger than that of the Mo atom, and missing a Se atom at a vacancy site results in a larger mass difference and therefore kinetic energy and potential energy difference. Furthermore, the monotonically increasing thermal conductivity with temperature for both systems at low temperatures indicates the importance of boundary scattering over defects and phonon-phonon scattering at these temperatures.
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Affiliation(s)
| | | | - Zhequan Yan
- G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology , Atlanta, Georgia 30313, United States
| | - Xufan Li
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States
| | | | | | - Satish Kumar
- G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology , Atlanta, Georgia 30313, United States
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States
| | - Kai Xiao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States
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47
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Park C, Kim SW, Yoon M. First-Principles Prediction of New Electrides with Nontrivial Band Topology Based on One-Dimensional Building Blocks. Phys Rev Lett 2018; 120:026401. [PMID: 29376709 DOI: 10.1103/physrevlett.120.026401] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Indexed: 06/07/2023]
Abstract
We introduce a new class of electrides with nontrivial band topology by coupling materials database searches and first-principles-calculations-based analysis. Cs_{3}O and Ba_{3}N are for the first time identified as a new class of electrides, consisting of one-dimensional (1D) nanorod building blocks. Their crystal structures mimic β-TiCl_{3} with the position of anions and cations exchanged. Unlike the weakly coupled nanorods of β-TiCl_{3}, Cs_{3}O and Ba_{3}N retain 1D anionic electrons along the hollow interrod sites; additionally, a strong interrod interaction in C_{3}O and Ba_{3}N induces band inversion in a 2D superatomic triangular lattice, resulting in Dirac-node lines. The new class of electrides can serve as a prototype for new electrides with a large cavity space that can be utilized for various applications such as gas storage, ion transport, and metal intercalation.
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Affiliation(s)
- Changwon Park
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
| | - Sung Wng Kim
- Department of Energy Science, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, South Korea
| | - Mina Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
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Affiliation(s)
- N. McGill
- University of Southampton Hospital; Southampton UK
| | - M. Yoon
- University of Southampton Hospital; Southampton UK
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Mahjouri-Samani M, Tian M, Puretzky AA, Chi M, Wang K, Duscher G, Rouleau CM, Eres G, Yoon M, Lasseter J, Xiao K, Geohegan DB. Nonequilibrium Synthesis of TiO 2 Nanoparticle "Building Blocks" for Crystal Growth by Sequential Attachment in Pulsed Laser Deposition. Nano Lett 2017; 17:4624-4633. [PMID: 28692299 DOI: 10.1021/acs.nanolett.7b01047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Nonequilibrium growth pathways for crystalline nanostructures with metastable phases are demonstrated through the gas-phase formation, attachment, and crystallization of ultrasmall amorphous nanoparticles as building blocks in pulsed laser deposition (PLD). Temporally and spatially resolved gated-intensified charge couple device (ICCD) imaging and ion probe measurements are employed as in situ diagnostics to understand and control the plume expansion conditions for the synthesis of nearly pure fluxes of ultrasmall (∼3 nm) amorphous TiO2 nanoparticles in background gases and their selective delivery to substrates. These amorphous nanoparticles assemble into loose, mesoporous assemblies on substrates at room temperature but dynamically crystallize by sequential particle attachment at higher substrate temperatures to grow nanostructures with different phases and morphologies. Molecular dynamics calculations are used to simulate and understand the crystallization dynamics. This work demonstrates that nonequilibrium crystallization by particle attachment of metastable ultrasmall nanoscale "building blocks" provides a versatile approach for exploring and controlling the growth of nanoarchitectures with desirable crystalline phases and morphologies.
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Affiliation(s)
| | - Mengkun Tian
- Department of Materials Science and Engineering, University of Tennessee , Knoxville, Tennessee 37966, United States
| | | | | | | | - Gerd Duscher
- Department of Materials Science and Engineering, University of Tennessee , Knoxville, Tennessee 37966, United States
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Yoon M, Oh J, Kim I, Kang S. 5700The delayed recovery of absolute lymphocyte count after induction therapy predicts cytomegalovirus viremia in heart transplantation. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.5700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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