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Liu Y, Wu R, Sun H, Chang A, Guo J, Zhang B. High-Entropy CeNbO 4+δ-Based Ceramics with Ultrahigh Comprehensive Thermosensitive Performances. ACS APPLIED MATERIALS & INTERFACES 2024; 16:28861-28873. [PMID: 38785114 DOI: 10.1021/acsami.4c04696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Next-generation advanced high-temperature sensors rely heavily on negative temperature coefficient thermosensitive ceramics with low cost, small volume, high sensitivity, and fast response. However, thus far, the enormous challenge of achieving ultrahigh stability and accuracy has become a critical bottleneck restricting the development of thermosensitive ceramics in high-temperature sensor applications. Here, we propose a high-entropy strategy to design a "cation valence self-equilibrium" system in CeNbO4+δ-based ceramics introducing redox couple compensation and ultrahigh density dislocations to solve the problem of temperature-dependent oxygen nonstoichiometry that restricts the performances of high-temperature thermosensitive ceramics. Ferroelastic domains are generated by enhancing the configurational entropy at both A and B sites, resulting in a dramatic increase of dislocation density to >1010 mm-2, which ultimately optimizes the thermosensitive performances. Extreme temperature measurement accuracy with R2 as high as 999.98‰ and RSS as low as 0.011 and high-temperature stability with ΔR/R0 as low as 0.23% after aging at 873 K for 1000 h are realized in high-entropy CeNbO4+δ-based ceramics, indicating a breakthrough in the comprehensive performances of thermosensitive ceramics. This work opens up an effective way to design thermosensitive materials with ultrahigh comprehensive performance to meet the requirements of advanced high-temperature sensors.
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Affiliation(s)
- Yafei Liu
- State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi 830011, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruifeng Wu
- State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi 830011, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hao Sun
- State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi 830011, China
| | - Aimin Chang
- State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi 830011, China
| | - Jing Guo
- State Key Laboratory for Mechanical Behavior of Materials & School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Bo Zhang
- State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi 830011, China
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2
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Sutter P, Khosravi-Khorashad L, Ciobanu CV, Sutter E. Chirality and dislocation effects in single nanostructures probed by whispering gallery modes. MATERIALS HORIZONS 2023; 10:3830-3839. [PMID: 37424314 DOI: 10.1039/d3mh00693j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Nanostructures such as nanoribbons and -wires are of interest as components for building integrated photonic systems, especially if their basic functionality as dielectric waveguides can be extended by chiroptical phenomena or modifications of their optoelectronic properties by extended defects, such as dislocations. However, conventional optical measurements typically require monodisperse (and chiral) ensembles, and identifying emerging chiral optical activity or dislocation effects in single nanostructures has remained an unmet challenge. Here we show that whispering gallery modes can probe chirality and dislocation effects in single nanowires. Wires of the van der Waals semiconductor germanium(II) sulfide (GeS), obtained by vapor-liquid-solid growth, invariably form as growth spirals around a single screw dislocation that gives rise to a chiral structure and can modify the electronic properties. Cathodoluminescence spectroscopy on single tapered GeS nanowires containing joined dislocated and defect-free segments, augmented by numerical simulations and ab-initio calculations, identifies chiral whispering gallery modes as well as a pronounced modulation of the electronic structure attributed to the screw dislocation. Our results establish chiral light-matter interactions and dislocation-induced electronic modifications in single nanostructures, paving the way for their application in multifunctional photonic architectures.
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Affiliation(s)
- Peter Sutter
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | | | - Cristian V Ciobanu
- Department of Mechanical Engineering, Colorado School of Mines, Golden, CO 80401, USA
| | - Eli Sutter
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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3
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Yue S, Zhao J, Sun Y, Niu H, Li H, Jing Y, Aluru NR. Multi-scale simulation of proton diffusion in dislocation cores in BaZrO 3. Phys Chem Chem Phys 2022; 24:21440-21451. [PMID: 36047850 DOI: 10.1039/d2cp02989h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dislocations are important for their effects on the chemical, electrical, magnetic, and transport properties of oxide materials, especially for electrochemical devices such as solid fuel cells and resistive memories, but these effects are still under-studied at the atomic level. We have developed a quantum mechanical/molecular mechanical (QM/MM)-based multiscale simulation program to reveal the diffusion properties of protons on 〈100〉 edge dislocations in BaZrO3 perovskite oxide. We find that the large free space and the presence of hydrogen bonds in the dislocation core structure lead to significant trapping of protons. The diffusion properties of protons in dislocation cores were investigated, and no evidence of pipeline diffusion was found from the calculated migration energy barriers, which not only did not accelerate ion diffusion but rather decreases the conductivity of ions. The proton diffusion properties of Y-doped BaZrO3 (BZY), with a dislocation core structure (BZY-D) and with a grain boundary structure (BZY-GB) were also compared. In all three structures, local lattice deformation occupies an essential part in the proton transfer and rotation processes. The change in bond order is calculated and it is found that the interaction with oxygen and Zr ions during proton transfer and rotation controls the energy barrier for local lattice deformation of the O-B-O motion, which affects the proton diffusion in the structure. Our study provides insight into proton diffusion in dislocations in terms of mechanical behavior, elucidates the origin of the energy barrier associated with proton diffusion in dislocations, and provides guidance for the preparation and application of proton conductors.
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Affiliation(s)
- Shaofeng Yue
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.
| | - Junqing Zhao
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.
| | - Yi Sun
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.
| | - Hongwei Niu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.
| | - Huyang Li
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.
| | - Yuhang Jing
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China.
| | - N R Aluru
- Walker Department of Mechanical Engineering, Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX 78712, USA
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Han Y, Liu X, Zhang Q, Huang M, Li Y, Pan W, Zong PA, Li L, Yang Z, Feng Y, Zhang P, Wan C. Ultra-dense dislocations stabilized in high entropy oxide ceramics. Nat Commun 2022; 13:2871. [PMID: 35610224 PMCID: PMC9130511 DOI: 10.1038/s41467-022-30260-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 04/11/2022] [Indexed: 11/29/2022] Open
Abstract
Dislocations are commonly present and important in metals but their effects have not been fully recognized in oxide ceramics. The large strain energy raised by the rigid ionic/covalent bonding in oxide ceramics leads to dislocations with low density (∼106 mm−2), thermodynamic instability and spatial inhomogeneity. In this paper, we report ultrahigh density (∼109 mm−2) of edge dislocations that are uniformly distributed in oxide ceramics with large compositional complexity. We demonstrate the dislocations are progressively and thermodynamically stabilized with increasing complexity of the composition, in which the entropy gain can compensate the strain energy of dislocations. We also find cracks are deflected and bridged with ∼70% enhancement of fracture toughness in the pyrochlore ceramics with multiple valence cations, due to the interaction with enlarged strain field around the immobile dislocations. This research provides a controllable approach to establish ultra-dense dislocations in oxide ceramics, which may open up another dimension to tune their properties. Dislocation engineering is important for designing structural materials. Here the authors demonstrate that a high-entropy oxide ceramic with a high density of edge dislocations can be stabilized by increasing the compositional complexity, resulting in enhanced fracture toughness.
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Affiliation(s)
- Yi Han
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Xiangyang Liu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Qiqi Zhang
- National Center for Electron Microscopy in Beijing, 100084, Beijing, China
| | - Muzhang Huang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Yi Li
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Wei Pan
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China.
| | - Peng-An Zong
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Lieyang Li
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Zesheng Yang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Yingjie Feng
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China
| | - Peng Zhang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China. .,Institute of Welding and Surface Engineering Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, 100124, Beijing, China.
| | - Chunlei Wan
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China.
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Liu Y, Liu X, Yang Z, Li H, Ding X, Xu M, Li X, Tu WF, Zhu M, Han YF. Unravelling the metal–support interactions in χ-Fe5C2/MgO catalysts for olefin synthesis directly from syngas. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02022f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural and electronic modifications of χ-Fe5C2 by MgO contribute to the high selectivity towards lower olefins and the high catalyst stability.
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Affiliation(s)
- Yitao Liu
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xianglin Liu
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Zixu Yang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Hu Li
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xiaoxu Ding
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Minjie Xu
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xinli Li
- Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
| | - Wei-Feng Tu
- Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
| | - Minghui Zhu
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Yi-Fan Han
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
- Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China
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Song K, Liu J, Lu N, Qi D, Qin W. Direct Atomic-scale Imaging of a Screw Dislocation Core Structure in Inorganic Halide Perovskites. Phys Chem Chem Phys 2022; 24:6393-6397. [DOI: 10.1039/d2cp00183g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Topological defects such as dislocations in crystalline materials usually have major impacts on materials’ mechanical, chemical and physical properties. Detailed knowledge of dislocation core structures is essential to understand their...
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Schwab T, Thomele D, Aicher K, Dunlop JWC, McKenna K, Diwald O. Rubbing Powders: Direct Spectroscopic Observation of Triboinduced Oxygen Radical Formation in MgO Nanocube Ensembles. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:22239-22248. [PMID: 34676020 PMCID: PMC8521521 DOI: 10.1021/acs.jpcc.1c05898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Powder compaction-induced surface chemistry in metal oxide nanocrystal ensembles is important for very diverse fields such as triboelectrics, tribocatalysts, surface abrasion, and cold sintering of ceramics. Using a range of spectroscopic techniques, we show that MgO nanocube powder compaction with uniaxial pressures that can be achieved by gentle manual rubbing or pressing (p ≥ 5 MPa) excites energetic electron-hole pairs and generates oxygen radicals at interfacial defect structures. While the identification of paramagnetic O- radicals and their adsorption complexes with O2 point to the emergence of hole centers, triboemitted electrons become scavenged by molecular oxygen to convert into adsorbed superoxide anions O2 - as measured by electron paramagnetic resonance (EPR). By means of complementary UV-photoexcitation experiments, we found that photon energies in the range between 3 and 6 eV produce essentially the same EPR spectroscopic fingerprints and optical absorption features. To provide insights into this effect, we performed density functional theory calculations to explore the energetics of charge separation involving the ionization of low-coordinated anions and surface-adsorbed O2 - radicals at points of contact. For all selected configurations, charge transfer is not spontaneous but requires an additional driving force. We propose that a plausible mechanism for oxygen radical formation is the generation of significant surface potential differences at points of contact under loading as a result of the highly inhomogeneous elastic deformations coupled with the flexoelectric effect.
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Affiliation(s)
- Thomas Schwab
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob-Haringer-Straße 2a, A-5020 Salzburg, Austria
| | - Daniel Thomele
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob-Haringer-Straße 2a, A-5020 Salzburg, Austria
| | - Korbinian Aicher
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob-Haringer-Straße 2a, A-5020 Salzburg, Austria
| | - John W. C. Dunlop
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob-Haringer-Straße 2a, A-5020 Salzburg, Austria
| | - Keith McKenna
- Department
of Physics, University of York, Heslington, YO10 5DD York, U.K.
| | - Oliver Diwald
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob-Haringer-Straße 2a, A-5020 Salzburg, Austria
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8
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Arandiyan H, S Mofarah S, Sorrell CC, Doustkhah E, Sajjadi B, Hao D, Wang Y, Sun H, Ni BJ, Rezaei M, Shao Z, Maschmeyer T. Defect engineering of oxide perovskites for catalysis and energy storage: synthesis of chemistry and materials science. Chem Soc Rev 2021; 50:10116-10211. [PMID: 34542117 DOI: 10.1039/d0cs00639d] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Oxide perovskites have emerged as an important class of materials with important applications in many technological areas, particularly thermocatalysis, electrocatalysis, photocatalysis, and energy storage. However, their implementation faces numerous challenges that are familiar to the chemist and materials scientist. The present work surveys the state-of-the-art by integrating these two viewpoints, focusing on the critical role that defect engineering plays in the design, fabrication, modification, and application of these materials. An extensive review of experimental and simulation studies of the synthesis and performance of oxide perovskites and devices containing these materials is coupled with exposition of the fundamental and applied aspects of defect equilibria. The aim of this approach is to elucidate how these issues can be integrated in order to shed light on the interpretation of the data and what trajectories are suggested by them. This critical examination has revealed a number of areas in which the review can provide a greater understanding. These include considerations of (1) the nature and formation of solid solutions, (2) site filling and stoichiometry, (3) the rationale for the design of defective oxide perovskites, and (4) the complex mechanisms of charge compensation and charge transfer. The review concludes with some proposed strategies to address the challenges in the future development of oxide perovskites and their applications.
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Affiliation(s)
- Hamidreza Arandiyan
- Laboratory of Advanced Catalysis for Sustainability, School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia. .,Centre for Applied Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, 124 La Trobe Street, Melbourne, VIC, Australia.
| | - Sajjad S Mofarah
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia.
| | - Charles C Sorrell
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia.
| | - Esmail Doustkhah
- National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Baharak Sajjadi
- Department of Chemical Engineering, University of Mississippi, University, MS, 38677, USA
| | - Derek Hao
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Yuan Wang
- Centre for Applied Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, 124 La Trobe Street, Melbourne, VIC, Australia. .,School of Chemistry, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Hongyu Sun
- Department of Micro- and Nanotechnology, Technical University of Denmark, Kongens Lyngby 2800, Denmark
| | - Bing-Jie Ni
- School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Mehran Rezaei
- Catalyst and Nanomaterials Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Zongping Shao
- WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6845, Australia. .,State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China
| | - Thomas Maschmeyer
- Laboratory of Advanced Catalysis for Sustainability, School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia.
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Porz L, Frömling T, Nakamura A, Li N, Maruyama R, Matsunaga K, Gao P, Simons H, Dietz C, Rohnke M, Janek J, Rödel J. Conceptual Framework for Dislocation-Modified Conductivity in Oxide Ceramics Deconvoluting Mesoscopic Structure, Core, and Space Charge Exemplified for SrTiO 3. ACS NANO 2021; 15:9355-9367. [PMID: 33169975 DOI: 10.1021/acsnano.0c04491] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The introduction of dislocations is a recently proposed strategy to tailor the functional and especially the electrical properties of ceramics. While several works confirm a clear impact of dislocations on electrical conductivity, some studies raise concern in particular when expanding to dislocation arrangements beyond a geometrically tractable bicrystal interface. Moreover, the lack of a complete classification on pertinent dislocation characteristics complicates a systematic discussion and hampers the design of dislocation-modified electrical conductivity. We proceed by mechanically introducing dislocations with three different mesoscopic structures into the model material single-crystal SrTiO3 and extensively characterizing them from both a mechanical as well as an electrical perspective. As a final result, a deconvolution of mesoscopic structure, core structure, and space charge enables us to obtain the complete picture of the effect of dislocations on functional properties, focusing here on electric properties.
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Affiliation(s)
- Lukas Porz
- Department of Materials and Earth Science, Technical University of Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Till Frömling
- Department of Materials and Earth Science, Technical University of Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Atsutomo Nakamura
- Department of Materials Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
- PRESTO, Japan Science and Technology Agency (JST), 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan
| | - Ning Li
- School of Physics, Peking University, Haidian District, Beijing 100871, China
| | - Ryohei Maruyama
- Department of Materials Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Katsuyuki Matsunaga
- Department of Materials Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Peng Gao
- School of Physics, Peking University, Haidian District, Beijing 100871, China
| | - Hugh Simons
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Christian Dietz
- Department of Materials and Earth Science, Technical University of Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Marcus Rohnke
- Institute of Physical Chemistry and Center for Materials Research, Justus Liebig University Gießen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Jürgen Janek
- Institute of Physical Chemistry and Center for Materials Research, Justus Liebig University Gießen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Jürgen Rödel
- Department of Materials and Earth Science, Technical University of Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
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10
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Challagulla S, Payra S, Chakraborty C, Singh SA, Roy S. Understanding the role of catalytic active sites for heterogeneous photocatalytic oxidation of methanol and thermal reduction of NOx. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.110505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Dholabhai PP, Martinez E, Uberuaga BP. Influence of Chemistry and Misfit Dislocation Structure on Dopant Segregation at Complex Oxide Heterointerfaces. ADVANCED THEORY AND SIMULATIONS 2018. [DOI: 10.1002/adts.201800095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Pratik P. Dholabhai
- School of Physics and Astronomy Rochester Institute of Technology Rochester NY 14623 USA
| | - Enrique Martinez
- Materials Science and Technology Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Blas P. Uberuaga
- Materials Science and Technology Division Los Alamos National Laboratory Los Alamos NM 87545 USA
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12
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Senevirathne RD, Abeykoon LK, De Silva NL, Yan CF, Bandara J. Sono-photocatalytic production of hydrogen by interface modified metal oxide insulators. ULTRASONICS SONOCHEMISTRY 2018; 45:279-285. [PMID: 29705322 DOI: 10.1016/j.ultsonch.2018.03.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/18/2018] [Accepted: 03/20/2018] [Indexed: 06/08/2023]
Abstract
Dielectric oxide materials are well-known insulators that have many applications in catalysis as well as in device manufacturing industries. However, these dielectric materials cannot be employed directly in photochemical reactions that are initiated by the absorption of UV-Vis photons. Despite their insensitivity to solar energy, dielectric materials can be made sono-photoactive even for low energy IR photons by modifications of the interfacial properties of dielectric materials by noble metals and metal oxides. In this investigation, by way of interface modification of dielectric MgO nanoparticles by Ag metal and Ag2O nanoparticles, IR photon initiated sono-photocatalytic activity of MgO is reported. The observed photocatalytic activity is found to be the synergic action of both IR light and sonication effect and sonication assisted a multi-step, sub-bandgap excitation of electrons in the MgO is proposed for the observed catalytic activity of Ag/Ag2O coated MgO nanoparticles. Our investigation reveals that other dielectric materials such as silver coated SiO2 and Al2O3 also exhibit IR active sono-photocatalytic activity.
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Affiliation(s)
| | - Lahiru K Abeykoon
- National Institute of Fundamental Studies, Hantana Road, CP 20000 Kandy, Sri Lanka
| | - Nuwan L De Silva
- National Institute of Fundamental Studies, Hantana Road, CP 20000 Kandy, Sri Lanka
| | - Chang-Feng Yan
- Hydrogen Production and Utilization Laboratory, Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion Chinese Academic of Sciences, No. 2 Nengyuan Road, Wushan, Tianhe District, Guangzhou 510640, China
| | - Jayasundera Bandara
- National Institute of Fundamental Studies, Hantana Road, CP 20000 Kandy, Sri Lanka.
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Shevchenko VP, Nagaev IY, Myasoedov NF. Heterogeneous Catalytic Synthesis of Organic Compounds Labeled with Hydrogen Isotopes without Using Solvents. RADIOCHEMISTRY 2018. [DOI: 10.1134/s1066362218020017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Cornu D, Rocker J, Gonchar A, Risse T, Freund HJ. Location of Trapped Electron Centers in the Bulk of Epitaxial MgO(001) Films Grown on Mo(001) Using in situ W-band Electron Paramagnetic Resonance Spectroscopy. PHYSICAL REVIEW LETTERS 2016; 117:016801. [PMID: 27419580 DOI: 10.1103/physrevlett.117.016801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Indexed: 06/06/2023]
Abstract
We present the first in situ W-band (94-GHz) electron paramagnetic resonance (EPR) study of a trapped electron center in thin MgO(001) films. The improved resolution of the high-field EPR experiments proves that the signal originate from a well-defined species present in the bulk of the films, whose projection of the principal g-tensor components onto the (001) plane are oriented along the [110] direction of the MgO lattice. Based on a comparison between the structural properties of the films, knowledge of the ability of bulk defects to trap electrons, and the properties of the EPR signal, it is possible to propose that the paramagnetic species are located at the origin of a screw dislocation in the bulk of the film.
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Affiliation(s)
- Damien Cornu
- Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin, Germany
| | - Jan Rocker
- Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin, Germany
| | | | - Thomas Risse
- Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin, Germany
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
- Berlin Joint EPR Laboratory, Freie Universität Berlin, 14195 Berlin, Germany
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15
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Hoff B, Henry CR, Barth C. Charging C60 islands with the AFM tip. NANOSCALE 2016; 8:411-419. [PMID: 26617348 DOI: 10.1039/c5nr04541j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We show that electrons can be transferred on demand from an AFM tip into single bulk-like C60 islands, which are supported on the insulating NaCl(001) surface. We exemplify this by controlled charge-manipulation experiments conducted in ultrahigh vacuum by noncontact AFM (nc-AFM), electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM). KPFM shows a homogeneous contrast at the islands, which is a signature for an equal distribution of the electrons in the T1u band. The charge dissipates during half a day due to an interaction of the charged C60 islands with defects in the near surface region of NaCl. Our results open the perspective in photo-voltaics to study charge attachment, stability and charge exchange with the environment of any C60 bulk-like system.
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Affiliation(s)
- Brice Hoff
- CNRS, Aix-Marseille University, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France.
| | - Claude R Henry
- CNRS, Aix-Marseille University, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France.
| | - Clemens Barth
- CNRS, Aix-Marseille University, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France.
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16
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Marrocchelli D, Sun L, Yildiz B. Dislocations in SrTiO3: Easy To Reduce but Not so Fast for Oxygen Transport. J Am Chem Soc 2015; 137:4735-48. [DOI: 10.1021/ja513176u] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Dario Marrocchelli
- Laboratory
for Electrochemical Interfaces, Department of Nuclear Science and
Engineering, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
| | - Lixin Sun
- Laboratory
for Electrochemical Interfaces, Department of Nuclear Science and
Engineering, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
| | - Bilge Yildiz
- Laboratory
for Electrochemical Interfaces, Department of Nuclear Science and
Engineering, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
- Department
of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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17
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Sun L, Marrocchelli D, Yildiz B. Edge dislocation slows down oxide ion diffusion in doped CeO2 by segregation of charged defects. Nat Commun 2015; 6:6294. [DOI: 10.1038/ncomms7294] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 01/15/2015] [Indexed: 12/11/2022] Open
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Horton MK, Rhode S, Sahonta SL, Kappers MJ, Haigh SJ, Pennycook TJ, Humphreys CJ, Dusane RO, Moram MA. Segregation of In to dislocations in InGaN. NANO LETTERS 2015; 15:923-930. [PMID: 25594363 DOI: 10.1021/nl5036513] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Dislocations are one-dimensional topological defects that occur frequently in functional thin film materials and that are known to degrade the performance of InxGa1-xN-based optoelectronic devices. Here, we show that large local deviations in alloy composition and atomic structure are expected to occur in and around dislocation cores in InxGa(1-x)N alloy thin films. We present energy-dispersive X-ray spectroscopy data supporting this result. The methods presented here are also widely applicable for predicting composition fluctuations associated with strain fields in other inorganic functional material thin films.
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Affiliation(s)
- Matthew K Horton
- Department of Materials, Imperial College London , Exhibition Road, London SW7 2AZ, United Kingdom
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