251
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Evolution of Moiré Profiles from van der Waals Superstructures of Boron Nitride Nanosheets. Sci Rep 2016; 6:26084. [PMID: 27188697 PMCID: PMC4870578 DOI: 10.1038/srep26084] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 04/20/2016] [Indexed: 11/12/2022] Open
Abstract
Two-dimensional (2D) van der Waals (vdW) superstructures, or vdW solids, are formed by the precise restacking of 2D nanosheet lattices, which can lead to unique physical and electronic properties that are not available in the parent nanosheets. Moiré patterns formed by the crystalline mismatch between adjacent nanosheets are the most direct features for vdW superstructures under microscopic imaging. In this article, transmission electron microscopy (TEM) observation of hexagonal Moiré patterns with unusually large micrometer-sized lateral areas (up to ~1 μm2) and periodicities (up to ~50 nm) from restacking of liquid exfoliated hexagonal boron nitride nanosheets (BNNSs) is reported. This observation was attributed to the long range crystallinity and the contaminant-free surfaces of these chemically inert nanosheets. Parallel-line-like Moiré fringes with similarly large periodicities were also observed. The simulations and experiments unambiguously revealed that the hexagonal patterns and the parallel fringes originated from the same rotationally mismatched vdW stacking of BNNSs and can be inter-converted by simply tilting the TEM specimen following designated directions. This finding may pave the way for further structural decoding of other 2D vdW superstructure systems with more complex Moiré images.
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252
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How to Increase the h-BN Crystallinity of Microfilms and Self-Standing Nanosheets: A Review of the Different Strategies Using the PDCs Route. CRYSTALS 2016. [DOI: 10.3390/cryst6050055] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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253
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Belosludov RV, Rhoda HM, Zhdanov RK, Belosludov VR, Kawazoe Y, Nemykin VN. Conceptual design of tetraazaporphyrin- and subtetraazaporphyrin-based functional nanocarbon materials: electronic structures, topologies, optical properties, and methane storage capacities. Phys Chem Chem Phys 2016; 18:13503-18. [PMID: 27128697 DOI: 10.1039/c5cp07552a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A large variety of conceptual three- and fourfold tetraazaporphyrin- and subtetraazaporphyrin-based functional 3D nanocage and nanobarrel structures have been proposed on the basis of in silico design. The designed structures differ in their sizes, topology, porosity, and conjugation properties. The stability of nanocages of Oh symmetry and nanobarrels of D4h symmetry was revealed on the basis of DFT and MD calculations, whereas their optical properties were assessed using a TDDFT approach and a long-range corrected LC-wPBE exchange-correlation functional. It was shown that the electronic structures and vertical excitation energies of the functional nanocage and nanobarrel structures could be easily tuned via their size, topology, and the presence of bridging sp(3) carbon atoms. TDDFT calculations suggest significantly lower excitation energies in fully conjugated nanocages and nanobarrels compared with systems with bridging sp(3) carbon fragments. Based on DFT and TDDFT calculations, the optical properties of the new materials can rival those of known quantum dots and are superior to those of monomeric phthalocyanines and their analogues. The methane gas adsorption properties of the new nanostructures and nanotubes generated by conversion from nanobarrels were studied using an MD simulation approach. The ability to store large quantities of methane (106-216 cm(3) (STP) cm(-3)) was observed in all cases with several compounds being close to or exceeding the DOE target of 180 cm(3) (STP) cm(-3) for material-based methane storage at a pressure of 3.5 MPa and room temperature.
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Affiliation(s)
- Rodion V Belosludov
- Institute for Materials Research, Tohoku University, Sendai, 980-85577, Japan.
| | - Hannah M Rhoda
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
| | - Ravil K Zhdanov
- Nikolaev Institute of Inorganic Chemistry, SB RAS, Lavrentiev 3, Novosibirsk 630090, Russia
| | - Vladimir R Belosludov
- Nikolaev Institute of Inorganic Chemistry, SB RAS, Lavrentiev 3, Novosibirsk 630090, Russia
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, 6-6-4 Aoba, Aramaki, Sendai 980-8579, Japan
| | - Victor N Nemykin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
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254
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Silva FWN, Cruz-Silva E, Terrones M, Terrones H, Barros EB. Transport properties through hexagonal boron nitride clusters embedded in graphene nanoribbons. NANOTECHNOLOGY 2016; 27:185203. [PMID: 27004996 DOI: 10.1088/0957-4484/27/18/185203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
First-principles calculations are employed in the study of the electronic and quantum transport properties of hexagonally shaped boron nitride (h-BN) clusters embedded in either zigzag or armchair graphene nanoribbons. Chemical doping of the h-BN cluster was taken into consideration by using carbon atoms to replace either the boron (B27N24C3) or the nitrogen (B27N24C3) sites in the central ring. While the quantum conductance of the system with zigzag edges is found to be spin-dependent, it was observed that the system with an armchair edge requires an electron imbalance in order to show a spin-dependent conductance. Furthermore, the possibility of molecular adsorption onto these doped systems is studied. The effects of the attached molecules to the quantum conductance shows the potential of these hybrid systems for molecular sensing applications.
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Affiliation(s)
- F W N Silva
- Departamento de Física, Universidade Federal do Ceará, Fortaleza, Ceará, 60455-900, Brazil
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255
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Zhou S, Zhao J. Two-dimensional B-C-O alloys: a promising class of 2D materials for electronic devices. NANOSCALE 2016; 8:8910-8918. [PMID: 27072060 DOI: 10.1039/c5nr08810k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Graphene, a superior 2D material with high carrier mobility, has limited application in electronic devices due to zero band gap. In this regard, boron and nitrogen atoms have been integrated into the graphene lattice to fabricate 2D semiconducting heterostructures. It is an intriguing question whether oxygen can, as a replacement of nitrogen, enter the sp2 honeycomb lattice and form stable B-C-O monolayer structures. Here we explore the atomic structures, energetic and thermodynamic stability, and electronic properties of various 2D B-C-O alloys using first-principles calculations. Our results show that oxygen can be stably incorporated into the graphene lattice by bonding with boron. The B and O species favor forming alternate patterns into the chain- or ring-like structures embedded in the pristine graphene regions. These B-C-O hybrid sheets can be either metals or semiconductors depending on the B : O ratio. The semiconducting (B2O)nCm and (B6O3)nCm phases exist under the B- and O-rich conditions, and possess a tunable band gap of 1.0-3.8 eV and high carrier mobility, retaining ∼1000 cm2 V(-1) s(-1) even for half coverage of B and O atoms. These B-C-O alloys form a new class of 2D materials that are promising candidates for high-speed electronic devices.
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Affiliation(s)
- Si Zhou
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, China.
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, China.
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256
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Wang R, Yang J, Wu X, Wang S. Local charge states in hexagonal boron nitride with Stone-Wales defects. NANOSCALE 2016; 8:8210-8219. [PMID: 27030259 DOI: 10.1039/c5nr09099g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A Stone-Wales (SW) defect is the simplest topological defect in graphene-like materials and can be potentially employed to design electronic devices . In this paper, we have systematically investigated the formation, structural, and electronic properties of the neutral and charged SW defects in hexagonal boron nitride (BN) using first-principles calculations. The transition states and energy barrier for the formation of SW defects demonstrate that the defected BN is stable. Our calculations show that there are two in-gap defect levels, which originate from the asymmetrical pentagon-heptagon pairs. The local defect configurations and electronic properties are sensitive to their charge states induced by the defect levels. The electronic band structures show that the negative and positive charged defects are mainly determined by shifting the conduction band minimum (CBM) and valence band maximum (VBM) respectively, and the SW-defected BN can realize -1 and +1 spin-polarized charge states. The effects of carbon (C) substitution on neutral and charged SW-defected BN have also been studied. Our results indicate that the C substitution of B in BN is in favour of the formation of SW defects. Structural and electronic calculations show rich charge-dependent properties of C substitutions in SW-defected BN, thus our theoretical study is important for various applications in the design of BN nanostructure-based devices.
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Affiliation(s)
- Rui Wang
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, China. and State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100190, China
| | - Jiali Yang
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, China.
| | - Xiaozhi Wu
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, China.
| | - Shaofeng Wang
- Institute for Structure and Function and Department of Physics, Chongqing University, Chongqing 400044, China.
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257
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Sun W, Meng Y, Fu Q, Wang F, Wang G, Gao W, Huang X, Lu F. High-Yield Production of Boron Nitride Nanosheets and Its Uses as a Catalyst Support for Hydrogenation of Nitroaromatics. ACS APPLIED MATERIALS & INTERFACES 2016; 8:9881-8. [PMID: 27023711 DOI: 10.1021/acsami.6b01008] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Single- or few-layered h-BN nanosheets (BNNSs) are analogous to graphene and possess unique properties. However, their technological applications were severely hindered by the low production efficiency of BNNSs. We reported here a study in which BNNSs were efficiently produced by exfoliating bulk h-BN powder in thionyl chloride without using any dispersion agents. The BNNSs yield was as high as 20%, and it could be doubled through the second round of exfoliation of the h-BN precipitate. Microscopic results revealed that the BNNSs generally consisted of 3-20 layers. Pd nanoparticles were successfully immobilized and uniformly distributed on BNNS surfaces through the deposition-precipitation method. The resultant Pd-BNNS catalyst exhibited high catalytic activity and recyclability for the hydrogenation of nitro aromatics, demonstrating that BNNSs served as a promising platform to fabricate heterogeneous catalysts.
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Affiliation(s)
- Wenliang Sun
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Yuan Meng
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Qinrui Fu
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Fei Wang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Guojie Wang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Wenhua Gao
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Xiaochun Huang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
| | - Fushen Lu
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University , Guangdong 515063, P. R. China
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258
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Li S, Yang T, Zou H, Liang M, Chen Y. Enhancement in thermal conductivity and mechanical properties via large-scale fabrication of boron nitride nanosheets. HIGH PERFORM POLYM 2016. [DOI: 10.1177/0954008316643766] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this study, a facial method of fabricating hexagonal boron nitride nanosheet (BNNS) was proposed. Isopropyl alcohol was employed as the solvent to obtain the BNNS via exfoliation of the pristine hexagonal boron nitride. The yield of the exfoliated BNNS with thickness less than 20 nm was as high as 0.17–0.2 mg mL−1. The BN- and BNNS-filled polyamide 6 (PA6) composites were subsequently prepared by melt blending, and a comparison of thermal conductivity and mechanical properties of the resultant composites were demonstrated. Results indicated that the PA6/BNNS composites showed superior mechanical and thermal conductive properties when compared with that of neat PA6 and PA6/BN composites. At a filler-loading fraction of 40 wt%, thermal conductivity of the PA6/BNNS composite reached 2.496 W mK−1, which was 21.8% higher than that of PA6/BN composites at the same filler-loading concentration. In addition, the tensile strength of PA6/BNNS composites was invariably higher than that of neat PA6, with a 6.23% increment at a filler concentration of 30 wt%. Based on the results of differential scanning calorimetry, a new crystallization peak ( TCC, 2) was observed at higher temperature region for the filler-containing composites and the position of the new peak gradually shifted to higher temperatures with an incremental loading concentration of BN and BNNS.
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Affiliation(s)
- Shengzhao Li
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
| | - Tuantuan Yang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
| | - Huawei Zou
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
| | - Mei Liang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
| | - Yang Chen
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, China
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259
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Drissi LB, Sadki S, Sadki K. Half-oxidized phosphorene: band gap and elastic properties modulation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:145501. [PMID: 26964522 DOI: 10.1088/0953-8984/28/14/145501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Based on a first principles approach, we study structural, electronic and elastic properties, as well as stabilities of all possible half-oxidized phosphorene conformers. Stability analysis reveals that oxygen chemisorption is an exothermic process in the six configurations despite the formation of interstitial oxygen bridges in three of them. Electronic structure calculations show that oxidation induces a band gap modulation ranging between 0.54 and 1.57 eV in the generalized gradient approximation corrected to 1.19 and 2.88 eV using GW. The mechanical response of the conformers is sensitively dependent on direction and indicates that the new derivatives are incompressible materials and one configuration has an auxetic behavior. The present results provide a basis for tailoring the electronic and elastic properties of phosphorene via half oxidation.
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Affiliation(s)
- L B Drissi
- LPHE, Modeling & Simulations, Faculty of Science, Mohammed V University in Rabat, Rabat, Morocco. CPM, Centre of Physics and Mathematics, Faculty of Science, Mohammed V University in Rabat, Rabat, Morocco. ICTP, International Centre for Theoretical Physics, Trieste, Italy
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260
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Sun P, Wang K, Zhu H. Recent Developments in Graphene-Based Membranes: Structure, Mass-Transport Mechanism and Potential Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:2287-310. [PMID: 26797529 DOI: 10.1002/adma.201502595] [Citation(s) in RCA: 289] [Impact Index Per Article: 36.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 08/24/2015] [Indexed: 05/22/2023]
Abstract
Significant achievements have been made on the development of next-generation filtration and separation membranes using graphene materials, as graphene-based membranes can afford numerous novel mass-transport properties that are not possible in state-of-art commercial membranes, making them promising in areas such as membrane separation, water desalination, proton conductors, energy storage and conversion, etc. The latest developments on understanding mass transport through graphene-based membranes, including perfect graphene lattice, nanoporous graphene and graphene oxide membranes are reviewed here in relation to their potential applications. A summary and outlook is further provided on the opportunities and challenges in this arising field. The aspects discussed may enable researchers to better understand the mass-transport mechanism and to optimize the synthesis of graphene-based membranes toward large-scale production for a wide range of applications.
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Affiliation(s)
- Pengzhan Sun
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Kunlin Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Hongwei Zhu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
- Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
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261
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Ko WY, Chen CY, Chen WH, Lin KJ. Fabrication of Hexagonal Boron Nitride Nanosheets by Using a Simple Thermal Exfoliation Process. J CHIN CHEM SOC-TAIP 2016. [DOI: 10.1002/jccs.201500335] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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262
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Ultrasensitive electrochemical immunoassay for surface array protein, a Bacillus anthracis biomarker using Au-Pd nanocrystals loaded on boron-nitride nanosheets as catalytic labels. Biosens Bioelectron 2016; 80:442-449. [PMID: 26874112 DOI: 10.1016/j.bios.2016.02.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2016] [Revised: 02/02/2016] [Accepted: 02/04/2016] [Indexed: 12/31/2022]
Abstract
Bacillus anthracis, the causative agent of anthrax, is a well known bioterrorism agent. The determination of surface array protein (Sap), a unique biomarker for B. anthracis can offer an opportunity for specific detection of B. anthracis in culture broth. In this study, we designed a new catalytic bionanolabel and fabricated a novel electrochemical immunosensor for ultrasensitive detection of B. anthracis Sap antigen. Bimetallic gold-palladium nanoparticles were in-situ grown on poly (diallyldimethylammonium chloride) functionalized boron nitride nanosheets (Au-Pd NPs@BNNSs) and conjugated with the mouse anti-B. anthracis Sap antibodies (Ab2); named Au-Pd NPs@BNNSs/Ab2. The resulting Au-Pd NPs@BNNSs/Ab2 bionanolabel demonstrated high catalytic activity towards reduction of 4-nitrophenol. The sensitivity of the electrochemical immunosensor along with redox cycling of 4-aminophenol to 4-quinoneimine was improved to a great extent. Under optimal conditions, the proposed immunosensor exhibited a wide working range from 5 pg/mL to 100 ng/mL with a minimum detection limit of 1 pg/mL B. anthracis Sap antigen. The practical applicability of the immunosensor was demonstrated by specific detection of Sap secreted by the B. anthracis in culture broth just after 1h of growth. These labels open a new direction for the ultrasensitive detection of different biological warfare agents and their markers in different matrices.
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263
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Cheng G, Yao S, Sang X, Hao B, Zhang D, Yap YK, Zhu Y. Evolution of Irradiation-Induced Vacancy Defects in Boron Nitride Nanotubes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:818-824. [PMID: 26682873 DOI: 10.1002/smll.201502440] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/23/2015] [Indexed: 06/05/2023]
Abstract
Irradiation-induced vacancy defects in multiwalled (MW) boron nitride nanotubes (BNNTs) are investigated via in situ high-resolution transmission electron microscope operated at 80 kV, with a homogeneous distribution of electron beam intensity. During the irradiation triangle-shaped vacancy defects are gradually generated in MW BNNTs under a mediate electron current density (30 A cm(-2)), by knocking the B atoms out. The vacancy defects grow along a well-defined direction within a wall at the early stage as a result of the curvature induced lattice strain, and then develop wall by wall. The orientation or the growth direction of the vacancy defects can be used to identify the chirality of an individual wall. With increasing electron current density, the shape of the irradiation-induced vacancy defects changes from regular triangle to irregular polygon.
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Affiliation(s)
- Guangming Cheng
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695, USA
| | - Shanshan Yao
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695, USA
| | - Xiahan Sang
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
| | - Boyi Hao
- Department of Physics, Michigan Technological University, Houghton, MI, 49931, USA
| | - Dongyan Zhang
- Department of Physics, Michigan Technological University, Houghton, MI, 49931, USA
| | - Yoke Khin Yap
- Department of Physics, Michigan Technological University, Houghton, MI, 49931, USA
| | - Yong Zhu
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695, USA
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA
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264
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Caneva S, Weatherup R, Bayer BC, Blume R, Cabrero-Vilatela A, Braeuninger-Weimer P, Martin MB, Wang R, Baehtz C, Schloegl R, Meyer JC, Hofmann S. Controlling Catalyst Bulk Reservoir Effects for Monolayer Hexagonal Boron Nitride CVD. NANO LETTERS 2016; 16:1250-61. [PMID: 26756610 PMCID: PMC4751513 DOI: 10.1021/acs.nanolett.5b04586] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 01/08/2016] [Indexed: 05/23/2023]
Abstract
Highly controlled Fe-catalyzed growth of monolayer hexagonal boron nitride (h-BN) films is demonstrated by the dissolution of nitrogen into the catalyst bulk via NH3 exposure prior to the actual growth step. This "pre-filling" of the catalyst bulk reservoir allows us to control and limit the uptake of B and N species during borazine exposure and thereby to control the incubation time and h-BN growth kinetics while also limiting the contribution of uncontrolled precipitation-driven h-BN growth during cooling. Using in situ X-ray diffraction and in situ X-ray photoelectron spectroscopy combined with systematic growth calibrations, we develop an understanding and framework for engineering the catalyst bulk reservoir to optimize the growth process, which is also relevant to other 2D materials and their heterostructures.
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Affiliation(s)
- Sabina Caneva
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
| | - Robert
S. Weatherup
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
- Materials
Sciences Division, Lawrence Berkeley National
Laboratory, 1 Cyclotron
Road, Berkeley, California 94720, United States
| | - Bernhard C. Bayer
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
- Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
| | - Raoul Blume
- Helmholtz-Zentrum Berlin für Materialen und Energie, D-12489 Berlin, Germany
| | - Andrea Cabrero-Vilatela
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
| | - Philipp Braeuninger-Weimer
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
| | - Marie-Blandine Martin
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
| | - Ruizhi Wang
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
| | - Carsten Baehtz
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | | | - Jannik C. Meyer
- Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
| | - Stephan Hofmann
- Department of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA Cambridge, United Kingdom
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265
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Duan ZQ, Liu YT, Xie XM, Ye XY, Zhu XD. h-BN Nanosheets as 2D Substrates to Load 0D Fe3O4Nanoparticles: A Hybrid Anode Material for Lithium-Ion Batteries. Chem Asian J 2016; 11:828-33. [DOI: 10.1002/asia.201501439] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 01/21/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Zhi-Qiang Duan
- Key Laboratory of Advanced Materials (MOE); Department of Chemical Engineering; Tsinghua University; Beijing 100084 China
| | - Yi-Tao Liu
- Key Laboratory of Advanced Materials (MOE); Department of Chemical Engineering; Tsinghua University; Beijing 100084 China
- State Key Laboratory of Precision Measurement Technology and Instruments; Department of Precision Instrument; Tsinghua University; Beijing 100084 China
| | - Xu-Ming Xie
- Key Laboratory of Advanced Materials (MOE); Department of Chemical Engineering; Tsinghua University; Beijing 100084 China
| | - Xiong-Ying Ye
- State Key Laboratory of Precision Measurement Technology and Instruments; Department of Precision Instrument; Tsinghua University; Beijing 100084 China
| | - Xiao-Dong Zhu
- State Key Laboratory of Urban Water Resource and Environment; Harbin Institute of Technology; Harbin 150090 China
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266
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Merenkov IS, Kasatkin IA, Kosinova ML. X-ray diffraction study of vertically aligned layers of h-BN, obtained by PECVD from borazine and ammonia or helium mixtures. J STRUCT CHEM+ 2016. [DOI: 10.1134/s0022476615060232] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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267
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Mansukhani ND, Guiney LM, Kim PJ, Zhao Y, Alducin D, Ponce A, Larios E, Yacaman MJ, Hersam MC. High-Concentration Aqueous Dispersions of Nanoscale 2D Materials Using Nonionic, Biocompatible Block Copolymers. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:294-300. [PMID: 26618498 PMCID: PMC4755936 DOI: 10.1002/smll.201503082] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Indexed: 05/22/2023]
Abstract
Conditions for the dispersion of molybdenum disulfide (MoS2) in aqueous solution at concentrations up to 0.12 mg mL(-1) using a range of nonionic, biocompatible block copolymers (i.e., Pluronics and Tetronics) are identified. Furthermore, the optimal Pluronic dispersant for MoS2 is found to be effective for a range of other 2D materials such as molybdenum diselenide, tungsten diselenide, tungsten disulfide, tin selenide, and boron nitride.
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Affiliation(s)
- Nikhita D Mansukhani
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208-3108, USA
| | - Linda M Guiney
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208-3108, USA
| | - Peter J Kim
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208-3108, USA
| | - Yichao Zhao
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208-3108, USA
| | - Diego Alducin
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-1644, USA
| | - Arturo Ponce
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-1644, USA
| | - Eduardo Larios
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-1644, USA
| | - Miguel Jose Yacaman
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-1644, USA
| | - Mark C Hersam
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208-3108, USA
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268
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Jung JH, Kotal M, Jang MH, Lee J, Cho YH, Kim WJ, Oh IK. Defect engineering route to boron nitride quantum dots and edge-hydroxylated functionalization for bio-imaging. RSC Adv 2016. [DOI: 10.1039/c6ra12455k] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A defect engineering method was developed using physical energy sources to synthesize boron nitride quantum dots (BNQDs) for bioimaging applications.
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Affiliation(s)
- Jung-Hwan Jung
- Creative Research Initiative Center for Functionally Antagonistic Nano-Engineering
- Department of Mechanical Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
| | - Moumita Kotal
- Creative Research Initiative Center for Functionally Antagonistic Nano-Engineering
- Department of Mechanical Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
| | - Min-Ho Jang
- Department of Physics
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| | - Junseok Lee
- Center for Self-assembled Complexity
- Institute of Basic Science (IBS)
- Department of Chemistry
- Pohang University of Science and Technology (POSTECH)
- Pohang 37673
| | - Yong-Hoon Cho
- Department of Physics
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| | - Won-Jong Kim
- Center for Self-assembled Complexity
- Institute of Basic Science (IBS)
- Department of Chemistry
- Pohang University of Science and Technology (POSTECH)
- Pohang 37673
| | - Il-Kwon Oh
- Creative Research Initiative Center for Functionally Antagonistic Nano-Engineering
- Department of Mechanical Engineering
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
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269
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Bernard S, Salameh C, Miele P. Boron nitride ceramics from molecular precursors: synthesis, properties and applications. Dalton Trans 2016; 45:861-73. [DOI: 10.1039/c5dt03633j] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hexagonal boron nitride (h-BN) attracts considerable interest particularly when it is prepared from borazine-based single-source precursors through chemical routes suitable for the shaping and the nanostructuration of the final ceramic.
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Affiliation(s)
- Samuel Bernard
- Institut Européen des membranes
- IEM
- UMR-5635
- Université de Montpellier
- 34095 Montpellier cedex 5
| | - Chrystelle Salameh
- Institut Européen des membranes
- IEM
- UMR-5635
- Université de Montpellier
- 34095 Montpellier cedex 5
| | - Philippe Miele
- Institut Européen des membranes
- IEM
- UMR-5635
- Université de Montpellier
- 34095 Montpellier cedex 5
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270
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Sha H, Faller R. A quantum chemistry study of curvature effects on boron nitride nanotubes/nanosheets for gas adsorption. Phys Chem Chem Phys 2016; 18:19944-9. [PMID: 27399852 DOI: 10.1039/c6cp02540d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Various boron nitride sheets interacting with noble gases, oxygen, and water on both sides of the surface were studied using high level DFT.
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Affiliation(s)
- Haoyan Sha
- Department of Chemical Engineering
- University of California, Davis
- Davis
- USA
| | - Roland Faller
- Department of Chemical Engineering
- University of California, Davis
- Davis
- USA
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271
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Posudievsky OY, Khazieieva OA, Cherepanov VV, Dovbeshko GI, Koshechko VG, Pokhodenko VD. Efficient dispersant-free liquid exfoliation down to the graphene-like state of solvent-free mechanochemically delaminated bulk hexagonal boron nitride. RSC Adv 2016. [DOI: 10.1039/c6ra08312a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Efficient dispersant-free liquid exfoliation down to the graphene-like state of solvent-free mechanochemically delaminated bulk hexagonal boron nitride was shown.
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Affiliation(s)
- Oleg Yu. Posudievsky
- L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
- Kyiv 03028
- Ukraine
| | - Oleksandra A. Khazieieva
- L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
- Kyiv 03028
- Ukraine
| | | | - Galina I. Dovbeshko
- Institute of Physics of the National Academy of Sciences of Ukraine
- Kyiv 03028
- Ukraine
| | - Vyacheslav G. Koshechko
- L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
- Kyiv 03028
- Ukraine
| | - Vitaly D. Pokhodenko
- L. V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine
- Kyiv 03028
- Ukraine
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272
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Ide Y, Nagao K, Saito K, Komaguchi K, Fuji R, Kogure A, Sugahara Y, Bando Y, Golberg D. h-BN nanosheets as simple and effective additives to largely enhance the activity of Au/TiO2 plasmonic photocatalysts. Phys Chem Chem Phys 2016; 18:79-83. [DOI: 10.1039/c5cp05958e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Au/TiO2 plasmonic photocatalysts showed largely enhanced activity for the oxidation of formic acid in water into CO2 when simply mixed with h-BN nanosheets, as a result of electron transfer from photoexcited Au/TiO2 to the additive to retard charge recombination.
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Affiliation(s)
- Y. Ide
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
- Graduate School of Creative Science and Engineering
| | - K. Nagao
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
| | - K. Saito
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
| | - K. Komaguchi
- Graduate School of Engineering
- Department of Applied Chemistry
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - R. Fuji
- Shimadzu Cooperation
- Hadano-shi
- Japan
| | - A. Kogure
- Shimadzu Techno-Research
- INC
- Hadano-shi
- Japan
| | - Y. Sugahara
- Graduate School of Creative Science and Engineering
- Waseda University
- Tokyo 169-8050
- Japan
- Department of Applied Chemistry
| | - Y. Bando
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | - D. Golberg
- International Center for Materials Nanoarchitectonics (WPI-MANA)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
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273
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Wu P, Zhu W, Chao Y, Zhang J, Zhang P, Zhu H, Li C, Chen Z, Li H, Dai S. A template-free solvent-mediated synthesis of high surface area boron nitride nanosheets for aerobic oxidative desulfurization. Chem Commun (Camb) 2016; 52:144-7. [DOI: 10.1039/c5cc07830j] [Citation(s) in RCA: 182] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Hexagonal BN nanosheets with high surface area are developed via methanol-mediated synthesis, presenting outstanding catalytic performance in aerobic oxidative desulfurization.
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Affiliation(s)
- Peiwen Wu
- School of Energy and Power Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Wenshuai Zhu
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
- Chemical Sciences Division
| | - Yanhong Chao
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
- Chemical Sciences Division
| | - Jinshui Zhang
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Pengfei Zhang
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Huiyuan Zhu
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Changfeng Li
- School of Energy and Power Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Zhigang Chen
- School of Chemistry and Chemical Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Huaming Li
- Institute for Energy Research
- Jiangsu University
- Zhenjiang 212013
- China
| | - Sheng Dai
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
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274
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Rai HM, Saxena SK, Mishra V, Late R, Kumar R, Sagdeo PR, Jaiswal NK, Srivastava P. Possibility of spin-polarized transport in edge fluorinated armchair boron nitride nanoribbons. RSC Adv 2016. [DOI: 10.1039/c5ra21832b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Calculated DOS for edge-fluorinated. ABNNRs; featuring half-metallicity.
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Affiliation(s)
- Hari Mohan Rai
- Material Research Laboratory
- Discipline of Physics
- Indian Institute of Technology Indore
- Indore
- India
| | - Shailendra K. Saxena
- Material Research Laboratory
- Discipline of Physics
- Indian Institute of Technology Indore
- Indore
- India
| | - Vikash Mishra
- Material Research Laboratory
- Discipline of Physics
- Indian Institute of Technology Indore
- Indore
- India
| | - Ravikiran Late
- Material Research Laboratory
- Discipline of Physics
- Indian Institute of Technology Indore
- Indore
- India
| | - Rajesh Kumar
- Material Research Laboratory
- Discipline of Physics
- Indian Institute of Technology Indore
- Indore
- India
| | - Pankaj R. Sagdeo
- Material Research Laboratory
- Discipline of Physics
- Indian Institute of Technology Indore
- Indore
- India
| | - Neeraj K. Jaiswal
- Discipline of Physics
- PDPM-Indian Institute of Information Technology
- Design and Manufacturing
- Jabalpur-482005
- India
| | - Pankaj Srivastava
- Computational Nanoscience and Technology Lab. (CNTL)
- ABV-Indian Institute of Information Technology and Management
- Gwalior-474015
- India
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275
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Xue Y, Ye YS, Chen FY, Wang H, Chen C, Xue ZG, Zhou XP, Xie XL, Mai YW. A simple and controllable graphene-templated approach to synthesise 2D silica-based nanomaterials using water-in-oil microemulsions. Chem Commun (Camb) 2016; 52:575-8. [DOI: 10.1039/c5cc06941f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mechanism of growing silica film on GO surface in water/BnOH biphase systems.
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Affiliation(s)
- Yang Xue
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Yun-Sheng Ye
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Fang-Yan Chen
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Hao Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Chao Chen
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Zhi-Gang Xue
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Xing-Ping Zhou
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Xiao-Lin Xie
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Yiu-Wing Mai
- Centre for Advanced Materials Technology (CAMT)
- School of Aerospace
- Mechanical and Mechatronic Engineering J07
- The University of Sydney
- Sydney
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276
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Zheng M, Dong H, Xiao Y, Liu S, Hu H, Liang Y, Sun L, Liu Y. Facile one-step and high-yield synthesis of few-layered and hierarchically porous boron nitride nanosheets. RSC Adv 2016. [DOI: 10.1039/c6ra07455c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Few-layered and hierarchically porous BNNSs high and tuneable H2 uptakes were prepared via a facile simultaneous etching and in situ nitridation method, in which metallic hexaboride (e.g., CaB6) and ammonium chloride were employed as raw materials.
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Affiliation(s)
- Mingtao Zheng
- Department of Materials and Engineering
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Hanwu Dong
- Department of Materials and Engineering
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Yong Xiao
- Department of Materials and Engineering
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Shuting Liu
- Department of Chemical & Biomolecular Engineering and Polymer Program
- Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - Hang Hu
- Department of Materials and Engineering
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Yeru Liang
- Department of Materials and Engineering
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
| | - Luyi Sun
- Department of Chemical & Biomolecular Engineering and Polymer Program
- Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - Yingliang Liu
- Department of Materials and Engineering
- College of Materials and Energy
- South China Agricultural University
- Guangzhou 510642
- China
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277
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Yuan Z, Li N. Manipulating the magnetic moment in phosphorene by lanthanide atom doping: a first-principle study. RSC Adv 2016. [DOI: 10.1039/c6ra14546a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Doping Ln atom can manipulate the magnetic moment in phosphorene in the range from 1 μBto 7 μB, which could be a next-generation candidates of potential dilute magnetic semiconductor.
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Affiliation(s)
- Ziyuan Yuan
- State Key Laboratory of Explosion Science and Technology
- School of Mechatronical Engineering
- Beijing Institute of Technology
- Beijing 100081
- P. R. China
| | - Nan Li
- State Key Laboratory of Explosion Science and Technology
- School of Mechatronical Engineering
- Beijing Institute of Technology
- Beijing 100081
- P. R. China
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278
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Huang T, Zeng X, Yao Y, Sun R, Meng F, Xu J, Wong C. Boron nitride@graphene oxide hybrids for epoxy composites with enhanced thermal conductivity. RSC Adv 2016. [DOI: 10.1039/c5ra27315c] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Boron nitride/graphene oxide hybrids prepared by an electrostatic self-assembly strategy were used as fillers for epoxy composites with high thermal conductivity.
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Affiliation(s)
- Tao Huang
- Department of Materials Science and Key Lab of Automobile Materials of MOE
- Jilin University
- Changchun 130012
- China
- Shenzhen Institutes of Advanced Technology
| | - Xiaoliang Zeng
- Shenzhen Institutes of Advanced Technology
- Chinese Academy of Sciences
- Shenzhen 518055
- China
- Shenzhen College of Advanced Technology
| | - Yimin Yao
- Shenzhen Institutes of Advanced Technology
- Chinese Academy of Sciences
- Shenzhen 518055
- China
- Shenzhen College of Advanced Technology
| | - Rong Sun
- Shenzhen Institutes of Advanced Technology
- Chinese Academy of Sciences
- Shenzhen 518055
- China
| | - Fanling Meng
- Department of Materials Science and Key Lab of Automobile Materials of MOE
- Jilin University
- Changchun 130012
- China
| | - Jianbin Xu
- Department of Electronics Engineering
- The Chinese University of Hong Kong
- Hong Kong
- China
| | - Chingping Wong
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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279
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García G, Atilhan M, Aparicio S. In silico rational design of ionic liquids for the exfoliation and dispersion of boron nitride nanosheets. Phys Chem Chem Phys 2016; 18:1212-24. [DOI: 10.1039/c5cp05376e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A requirement for exploiting most of the unique properties of boron-nitride (BN) nanosheets is their isolation from the bulk material.
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Affiliation(s)
- Gregorio García
- Department of Chemistry
- University of Burgos
- 09001 Burgos
- Spain
| | - Mert Atilhan
- Department of Chemical Engineering
- Qatar University
- Doha
- Qatar
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280
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Karaush NN, Bondarchuk SV, Baryshnikov GV, Minaeva VA, Sun WH, Minaev BF. Computational study of the structure, UV-vis absorption spectra and conductivity of biphenylene-based polymers and their boron nitride analogues. RSC Adv 2016. [DOI: 10.1039/c6ra06832d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We calculated electronic and spectral properties of the 1D and 2D carbon and boron nitride materials composed of four-, six- and eight-membered rings by the DFT approach, including the band structure analysis.
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Affiliation(s)
| | | | - Gleb V. Baryshnikov
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
- Department of Theoretical Chemistry and Biology
- School of Biotechnology
| | | | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
- Chinese Academy of Science
- 100190 Beijing
- China
| | - Boris F. Minaev
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science
- Institute of Chemistry
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281
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Xiao F, Chen Z, Casillas G, Richardson C, Li H, Huang Z. Controllable synthesis of few-layered and hierarchically porous boron nitride nanosheets. Chem Commun (Camb) 2016; 52:3911-4. [DOI: 10.1039/c5cc09348a] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Few-layered porous boron nitride nanosheets prepared using MgB2 as a dynamic template show good CO2 adsorption selectivity.
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Affiliation(s)
- Feng Xiao
- Institute for Superconducting and Electronic Materials
- University of Wollongong
- Wollongong
- Australia
| | - Zhixin Chen
- Bluescope Steel Metallurgical Centre
- University of Wollongong
- Wollongong
- Australia
| | - Gilberto Casillas
- Electron Microscopy Centre
- University of Wollongong
- Wollongong
- Australia
| | - Christopher Richardson
- School of Chemistry
- Faculty of Science, Medicine and Health
- University of Wollongong
- Wollongong
- Australia
| | - Huijun Li
- School of Mechanical, Materials and Mechatronic Engineering
- University of Wollongong
- Wollongong
- Australia
| | - Zhenguo Huang
- Institute for Superconducting and Electronic Materials
- University of Wollongong
- Wollongong
- Australia
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282
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Kan M, Li Y, Sun Q. Recent advances in hybrid graphene-BN planar structures. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2015. [DOI: 10.1002/wcms.1237] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Min Kan
- Department of Materials Science and Engineering; Peking University; Beijing China
- Kuang-Chi Institute of Advanced Technology; ShenZhen China
| | - Yawei Li
- Department of Materials Science and Engineering; Peking University; Beijing China
- Center for Applied Physics and Technology; Peking University; Beijing China
| | - Qiang Sun
- Department of Materials Science and Engineering; Peking University; Beijing China
- Center for Applied Physics and Technology; Peking University; Beijing China
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283
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Chimene D, Alge DL, Gaharwar AK. Two-Dimensional Nanomaterials for Biomedical Applications: Emerging Trends and Future Prospects. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:7261-84. [PMID: 26459239 DOI: 10.1002/adma.201502422] [Citation(s) in RCA: 448] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 07/16/2015] [Indexed: 05/18/2023]
Abstract
Two-dimensional (2D) nanomaterials are ultrathin nanomaterials with a high degree of anisotropy and chemical functionality. Research on 2D nanomaterials is still in its infancy, with the majority of research focusing on elucidating unique material characteristics and few reports focusing on biomedical applications of 2D nanomaterials. Nevertheless, recent rapid advances in 2D nanomaterials have raised important and exciting questions about their interactions with biological moieties. 2D nanoparticles such as carbon-based 2D materials, silicate clays, transition metal dichalcogenides (TMDs), and transition metal oxides (TMOs) provide enhanced physical, chemical, and biological functionality owing to their uniform shapes, high surface-to-volume ratios, and surface charge. Here, we focus on state-of-the-art biomedical applications of 2D nanomaterials as well as recent developments that are shaping this emerging field. Specifically, we describe the unique characteristics that make 2D nanoparticles so valuable, as well as the biocompatibility framework that has been investigated so far. Finally, to both capture the growing trend of 2D nanomaterials for biomedical applications and to identify promising new research directions, we provide a critical evaluation of potential applications of recently developed 2D nanomaterials.
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Affiliation(s)
- David Chimene
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Daniel L Alge
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Akhilesh K Gaharwar
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
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284
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Xiao F, Naficy S, Casillas G, Khan MH, Katkus T, Jiang L, Liu H, Li H, Huang Z. Edge-Hydroxylated Boron Nitride Nanosheets as an Effective Additive to Improve the Thermal Response of Hydrogels. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:7196-203. [PMID: 26499097 DOI: 10.1002/adma.201502803] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 08/05/2015] [Indexed: 05/05/2023]
Abstract
Upon flowing hot steam over hexagonal boron nitride (h-BN) bulk powder, efficient exfoliation and hydroxylation of BN occur simultaneously. Through effective hydrogen bonding with water and N-isopropylacrylamide, edge-hydroxylated BN nanosheets dramatically improve the dimensional change and dye release of this temperature-sensitive hydrogel and thereby enhance its efficacy in bionic, soft robotic, and drug-delivery applications.
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Affiliation(s)
- Feng Xiao
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Sina Naficy
- Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Gilberto Casillas
- Electron Microscopy Center, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Majharul H Khan
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Tomas Katkus
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Lei Jiang
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China
| | - Huakun Liu
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Huijun Li
- School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Zhenguo Huang
- Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
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285
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High-efficiency exfoliation of layered materials into 2D nanosheets in switchable CO2/Surfactant/H2O system. Sci Rep 2015; 5:16764. [PMID: 26568039 PMCID: PMC4645177 DOI: 10.1038/srep16764] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 10/20/2015] [Indexed: 11/08/2022] Open
Abstract
Layered materials present attractive and important properties due to their two-dimensional (2D) structure, allowing potential applications including electronics, optoelectronics, and catalysis. However, fully exploiting the outstanding properties will require a method for their efficient exfoliation. Here we present that a series of layered materials can be successfully exfoliated into single- and few-layer nanosheets using the driving forces coming from the phase inversion, i.e., from micelles to reverse micelles in the emulsion microenvironment built by supercritical carbon dioxide (SC CO2). The effect of variable experimental parameters including CO2 pressure, ethanol/water ratio, and initial concentration of bulk materials on the exfoliation yield have been investigated. Moreover, we demonstrate that the exfoliated 2D nanosheets have their worthwhile applications, for example, graphene can be used to prepare conductive paper, MoS2 can be used as fluorescent label to perform cellular labelling, and BN can effectively reinforce polymers leading to the promising mechanical properties.
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286
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Aldalbahi A, Zhou AF, Feng P. Variations in Crystalline Structures and Electrical Properties of Single Crystalline Boron Nitride Nanosheets. Sci Rep 2015; 5:16703. [PMID: 26563901 PMCID: PMC4643278 DOI: 10.1038/srep16703] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Accepted: 10/06/2015] [Indexed: 11/10/2022] Open
Abstract
We report the studies of (1) the basic mechanism underlying the formation of defect-free, single crystalline boron nitride nanosheets (BNNSs) synthesized using pulsed laser plasma deposition (PLPD) technique, (2) the variation in the crystalline structure at the edges of the hexagonal boron nitride (h-BN) nanosheets, and (3) the basic electrical properties related to the BNNSs tunneling effect and electrical breakdown voltage. The nanoscale morphologies of BNNSs are characterized using scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM). The results show that each sample consisted of a number of transparent BNNSs that partially overlapped one another. Varying the deposition duration yielded different thicknesses of sample but did not affect the morphology, structure, and thickness of individual BNNSs pieces. Analysis of the SEM and HRTEM data revealed changes in the spatial period of the B3–N3 hexagonal structures and the interlayer distance at the edge of the BNNSs, which occurred due to the limited number of atomic layers and was confirmed further by x-ray diffraction (XRD) study. The experimental results clearly indicate that the values of the electrical conductivities of the super-thin BNNSs and the effect of temperature relied strongly on the direction of observation.
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Affiliation(s)
- Ali Aldalbahi
- Department of Chemistry, King Saud University, Riyadh 11451, Saudi Arabia
| | - Andrew Feng Zhou
- Department of Physics, Indiana University of Pennsylvania, Indiana, PA 15705, USA
| | - Peter Feng
- Department of Physics, University of Puerto Rico, San Juan, PR/USA 00936-8377
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287
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Zhu J, Kang J, Kang J, Jariwala D, Wood JD, Seo JWT, Chen KS, Marks TJ, Hersam MC. Solution-Processed Dielectrics Based on Thickness-Sorted Two-Dimensional Hexagonal Boron Nitride Nanosheets. NANO LETTERS 2015; 15:7029-7036. [PMID: 26348822 DOI: 10.1021/acs.nanolett.5b03075] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Gate dielectrics directly affect the mobility, hysteresis, power consumption, and other critical device metrics in high-performance nanoelectronics. With atomically flat and dangling bond-free surfaces, hexagonal boron nitride (h-BN) has emerged as an ideal dielectric for graphene and related two-dimensional semiconductors. While high-quality, atomically thin h-BN has been realized via micromechanical cleavage and chemical vapor deposition, existing liquid exfoliation methods lack sufficient control over h-BN thickness and large-area film quality, thus limiting its use in solution-processed electronics. Here, we employ isopycnic density gradient ultracentrifugation for the preparation of monodisperse, thickness-sorted h-BN inks, which are subsequently layer-by-layer assembled into ultrathin dielectrics with low leakage currents of 3 × 10(-9) A/cm(2) at 2 MV/cm and high capacitances of 245 nF/cm(2). The resulting solution-processed h-BN dielectric films enable the fabrication of graphene field-effect transistors with negligible hysteresis and high mobilities up to 7100 cm(2) V(-1) s(-1) at room temperature. These h-BN inks can also be used as coatings on conventional dielectrics to minimize the effects of underlying traps, resulting in improvements in overall device performance. Overall, this approach for producing and assembling h-BN dielectric inks holds significant promise for translating the superlative performance of two-dimensional heterostructure devices to large-area, solution-processed nanoelectronics.
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Affiliation(s)
- Jian Zhu
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Joohoon Kang
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Junmo Kang
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Deep Jariwala
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Joshua D Wood
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Jung-Woo T Seo
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Kan-Sheng Chen
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Tobin J Marks
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
| | - Mark C Hersam
- Department of Materials Science and Engineering, ‡Graduate Program in Applied Physics, §Department of Chemistry, and ∥Department of Medicine, Northwestern University , Evanston, Illinois 60208, United States
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288
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Liao Y, Tu K, Han X, Hu L, Connell JW, Chen Z, Lin Y. Oxidative Etching of Hexagonal Boron Nitride Toward Nanosheets with Defined Edges and Holes. Sci Rep 2015; 5:14510. [PMID: 26416484 PMCID: PMC4586441 DOI: 10.1038/srep14510] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 09/01/2015] [Indexed: 11/24/2022] Open
Abstract
Lateral surface etching of two-dimensional (2D) nanosheets results in holey 2D nanosheets that have abundant edge atoms. Recent reports on holey graphene showed that holey 2D nanosheets can outperform their intact counterparts in many potential applications such as energy storage, catalysis, sensing, transistors, and molecular transport/separation. From both fundamental and application perspectives, it is desirable to obtain holey 2D nanosheets with defined hole morphology and hole edge structures. This remains a great challenge for graphene and is little explored for other 2D nanomaterials. Here, a facile, controllable, and scalable method is reported to carve geometrically defined pit/hole shapes and edges on hexagonal boron nitride (h-BN) basal plane surfaces via oxidative etching in air using silver nanoparticles as catalysts. The etched h-BN was further purified and exfoliated into nanosheets that inherited the hole/edge structural motifs and, under certain conditions, possess altered optical bandgap properties likely induced by the enriched zigzag edge atoms. This method opens up an exciting approach to further explore the physical and chemical properties of hole- and edge-enriched boron nitride and other 2D nanosheets, paving the way toward applications that can take advantage of their unique structures and performance characteristics.
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Affiliation(s)
- Yunlong Liao
- National Institute of Aerospace, 100 Exploration Way, Hampton, VA, 23666, USA.,Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico, 00931, USA
| | - Kaixiong Tu
- Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico, 00931, USA
| | - Xiaogang Han
- Department of Materials Science and Engineering, The University of Maryland, College Park, MD, 20742, USA
| | - Liangbing Hu
- Department of Materials Science and Engineering, The University of Maryland, College Park, MD, 20742, USA
| | - John W Connell
- Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton, VA, 23681-2199, USA
| | - Zhongfang Chen
- Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico, 00931, USA
| | - Yi Lin
- National Institute of Aerospace, 100 Exploration Way, Hampton, VA, 23666, USA.,Department of Applied Science, The College of William and Mary, Williamsburg, VA, 23185, USA
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289
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Yang G, Zhu C, Du D, Zhu J, Lin Y. Graphene-like two-dimensional layered nanomaterials: applications in biosensors and nanomedicine. NANOSCALE 2015; 7:14217-31. [PMID: 26234249 DOI: 10.1039/c5nr03398e] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The development of nanotechnology provides promising opportunities for various important applications. The recent discovery of atomically-thick two-dimensional (2D) nanomaterials can offer manifold perspectives to construct versatile devices with high-performance to satisfy multiple requirements. Many studies directed at graphene have stimulated renewed interest on graphene-like 2D layered nanomaterials (GLNs). GLNs including boron nitride nanosheets, graphitic-carbon nitride nanosheets and transition metal dichalcogenides (e.g. MoS2 and WS2) have attracted significant interest in numerous research fields from physics and chemistry to biology and engineering, which has led to numerous interdisciplinary advances in nano science. Benefiting from the unique physical and chemical properties (e.g. strong mechanical strength, high surface area, unparalleled thermal conductivity, remarkable biocompatibility and ease of functionalization), these 2D layered nanomaterials have shown great potential in biochemistry and biomedicine. This review summarizes recent advances of GLNs in applications of biosensors and nanomedicine, including electrochemical biosensors, optical biosensors, bioimaging, drug delivery and cancer therapy. Current challenges and future perspectives in these rapidly developing areas are also outlined. It is expected that they will have great practical foundation in biomedical applications with future efforts.
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Affiliation(s)
- Guohai Yang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China.
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290
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Luo W, Zhou L, Fu K, Yang Z, Wan J, Manno M, Yao Y, Zhu H, Yang B, Hu L. A Thermally Conductive Separator for Stable Li Metal Anodes. NANO LETTERS 2015; 15:6149-54. [PMID: 26237519 DOI: 10.1021/acs.nanolett.5b02432] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Li metal anodes have attracted considerable research interest due to their low redox potential (-3.04 V vs standard hydrogen electrode) and high theoretical gravimetric capacity of 3861 mAh/g. Battery technologies using Li metal anodes have shown much higher energy density than current Li-ion batteries (LIBs) such as Li-O2 and Li-S systems. However, issues related to dendritic Li formation and low Coulombic efficiency have prevented the use of Li metal anode technology in many practical applications. In this paper, a thermally conductive separator coated with boron-nitride (BN) nanosheets has been developed to improve the stability of the Li metal anodes. It is found that using the BN-coated separator in a conventional organic carbonate-based electrolyte results in the Coulombic efficiency stabilizing at 92% over 100 cycles at a current rate of 0.5 mA/cm(2) and 88% at 1.0 mA/cm(2). The improved Coulombic efficiency and reliability of the Li metal anodes is due to the more homogeneous thermal distribution resulting from the thermally conductive BN coating and to the smaller surface area of initial Li deposition.
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Affiliation(s)
- Wei Luo
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Lihui Zhou
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Kun Fu
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Zhi Yang
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Jiayu Wan
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Michael Manno
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Yonggang Yao
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Hongli Zhu
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Bao Yang
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Liangbing Hu
- Department of Materials Science and Engineering and ‡Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
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291
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Cazorla C. The role of density functional theory methods in the prediction of nanostructured gas-adsorbent materials. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.05.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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292
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Aditya T, Pal A, Pal T. Nitroarene reduction: a trusted model reaction to test nanoparticle catalysts. Chem Commun (Camb) 2015; 51:9410-31. [PMID: 25872865 DOI: 10.1039/c5cc01131k] [Citation(s) in RCA: 409] [Impact Index Per Article: 45.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Nitrophenol reduction to aminophenol with a reducing agent is conveniently carried out in aqueous medium mainly with a metal or metal oxide catalyst. This reduction is presently considered as a benchmark reaction to test a catalyst nanoparticle. Thousands of original reports have enriched this field of nanoparticle catalyzed reaction. Synthesis of different metal and metal oxide nanoparticles and their composites along with their role as catalysts for nitrophenol reduction with varying reducing agents have been elucidated here. The progress of the reaction is conveniently monitored by UV-visible spectrophotometry and hence it becomes a universally accepted model reaction. In this review we have discussed the reaction kinetics considering its elegance and importance enlightening the long known Langmuir-Hinshelwood mechanism and Eley-Rideal mechanism at length, along with a few other mechanisms recently reported. A brief description of the synthetic procedures of various nanoparticles and their respective catalytic behaviour towards nitroarene reduction has also been accounted here.
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Affiliation(s)
- Teresa Aditya
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.
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293
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Cui Z, Martinez AP, Adamson DH. PMMA functionalized boron nitride sheets as nanofillers. NANOSCALE 2015; 7:10193-7. [PMID: 25988530 DOI: 10.1039/c5nr00936g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We report the functionalization of hexagonal boron nitride (hBN) with polymer chains. These chains are grown by atom transfer radical polymerization (ATRP) from hBN following thermal treatment. When used as a nanofiller, the material shows improved dispersion resulting in significantly improved toughness as compared to pristine hBN without polymer functionalization. The polymer functionalized BN is also characterized by TGA, FTIR and FESEM.
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Affiliation(s)
- Zhenhua Cui
- Institute of Materials Science, Polymer Program, University of Connecticut, Storrs, CT 06269, USA.
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294
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Zeng X, Ye L, Yu S, Li H, Sun R, Xu J, Wong CP. Artificial nacre-like papers based on noncovalent functionalized boron nitride nanosheets with excellent mechanical and thermally conductive properties. NANOSCALE 2015; 7:6774-81. [PMID: 25807278 DOI: 10.1039/c5nr00228a] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Inspired by the nano/microscale hierarchical structure and the precise inorganic/organic interface of natural nacre, we fabricated artificial nacre-like papers based on noncovalent functionalized boron nitride nanosheets (NF-BNNSs) and poly(vinyl alcohol) (PVA) via a vacuum-assisted self-assembly technique. The artificial nacre-like papers exhibit excellent tensile strength (125.2 MPa), on a par with that of the natural nacre, and moreover display a 30% higher toughness (2.37 MJ m(-3)) than that of the natural nacre. These excellent mechanical properties result from an ordered 'brick-and-mortar' arrangement of NF-BNNSs and PVA, in which the long-chain PVA molecules act as the bridge to link NF-BNNSs via hydrogen bonds. The resulting papers also render high thermal conductivity (6.9 W m(-1) K(-1)), and reveal their superiority as flexible substrates to support light-emitting-diode chips. The combined mechanical and thermal properties make the materials highly desirable as flexible substrates for next-generation commercial portable electronics.
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Affiliation(s)
- Xiaoliang Zeng
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
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295
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Kuang Z, Chen Y, Lu Y, Liu L, Hu S, Wen S, Mao Y, Zhang L. Fabrication of highly oriented hexagonal boron nitride nanosheet/elastomer nanocomposites with high thermal conductivity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:1655-1659. [PMID: 25365940 DOI: 10.1002/smll.201402569] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 10/01/2014] [Indexed: 06/04/2023]
Abstract
A homogeneous dispersion of hexagonal boron nitride nanosheets (BNNSs) in elastomers is obtained by solution compounding methods, and a high orientation of BNNSs is achieved by strong shearing. The composites show high thermal conductivities, especially when BNNS loading exceeds 17.5 vol%, indicating that the material is promising for thermal-management applications which need high thermal conductivity, low dielectric constant, and adequate softness.
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Affiliation(s)
- Zhiqiao Kuang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China; Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing, 100029, China
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296
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Shen H, Guo J, Wang H, Zhao N, Xu J. Bioinspired modification of h-BN for high thermal conductive composite films with aligned structure. ACS APPLIED MATERIALS & INTERFACES 2015; 7:5701-5708. [PMID: 25707681 DOI: 10.1021/am507416y] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
With the development of microelectronic technology, the demand of insulating electronic encapsulation materials with high thermal conductivity is ever growing and much attractive. Surface modification of chemical inert h-BN is yet a distressing issue which hinders its applications in thermal conductive composites. Here, dopamine chemistry has been used to achieve the facile surface modification of h-BN microplatelets by forming a polydopamine (PDA) shell on its surface. The successful and effective preparation of h-BN@PDA microplatelets has been confirmed by SEM, EDS, TEM, Raman spectroscopy, and TGA investigations. The PDA coating increases the dispersibility of the filler and enhances its interaction with PVA matrix as well. Based on the combination of surface modification and doctor blading, composite films with aligned h-BN@PDA are fabricated. The oriented fillers result in much higher in-plane thermal conductivities than the films with disordered structures produced by casting or using the pristine h-BN. The thermal conductivity is as high as 5.4 W m(-1) K(-1) at 10 vol % h-BN@PDA loading. The procedure is eco-friendly, easy handling, and suitable for the practical application in large scale.
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Affiliation(s)
- Heng Shen
- †Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- ‡University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Guo
- †Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- ‡University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hao Wang
- †Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- ‡University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ning Zhao
- †Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jian Xu
- †Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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297
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Xie S, Istrate OM, May P, Barwich S, Bell AP, Khan U, Coleman JN. Boron nitride nanosheets as barrier enhancing fillers in melt processed composites. NANOSCALE 2015; 7:4443-4450. [PMID: 25679478 DOI: 10.1039/c4nr07228f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this work we have used melt-processing to mix liquid-exfoliated boron-nitride nanosheets with PET to produce composites for gas barrier applications. Sonication of h-BN powder, followed by centrifugation-based size-selection, was used to prepare suspensions of nanosheets with aspect ratio >1000. The solvent was removed to give a weakly aggregated powder which could easily be mixed into PET, giving a composite containing well-dispersed nanosheets. These composites showed very good barrier performance with oxygen permeability reductions of 42% by adding just 0.017 vol% nanosheets. At low loading levels the composites were almost completely transparent. At higher loading levels, while some haze was introduced, the permeability fell by ∼70% on addition of 3 vol% nanosheets.
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Affiliation(s)
- Shaobo Xie
- School of Physics, CRANN and AMBER, Trinity College Dublin, Dublin 2, Ireland.
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298
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Caneva S, Weatherup R, Bayer BC, Brennan B, Spencer S, Mingard K, Cabrero-Vilatela A, Baehtz C, Pollard AJ, Hofmann S. Nucleation control for large, single crystalline domains of monolayer hexagonal boron nitride via Si-doped Fe catalysts. NANO LETTERS 2015; 15:1867-75. [PMID: 25664483 PMCID: PMC4358078 DOI: 10.1021/nl5046632] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 01/30/2015] [Indexed: 05/23/2023]
Abstract
The scalable chemical vapor deposition of monolayer hexagonal boron nitride (h-BN) single crystals, with lateral dimensions of ∼0.3 mm, and of continuous h-BN monolayer films with large domain sizes (>25 μm) is demonstrated via an admixture of Si to Fe catalyst films. A simple thin-film Fe/SiO2/Si catalyst system is used to show that controlled Si diffusion into the Fe catalyst allows exclusive nucleation of monolayer h-BN with very low nucleation densities upon exposure to undiluted borazine. Our systematic in situ and ex situ characterization of this catalyst system establishes a basis for further rational catalyst design for compound 2D materials.
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Affiliation(s)
- Sabina Caneva
- Department
of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA, Cambridge, United Kingdom
| | - Robert
S. Weatherup
- Department
of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA, Cambridge, United Kingdom
| | - Bernhard C. Bayer
- Department
of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA, Cambridge, United Kingdom
- Faculty
of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
| | - Barry Brennan
- National Physical
Laboratory, Hampton Rd, TW11 0LW, Teddington, Middlesex, United Kingdom
| | - Steve
J. Spencer
- National Physical
Laboratory, Hampton Rd, TW11 0LW, Teddington, Middlesex, United Kingdom
| | - Ken Mingard
- National Physical
Laboratory, Hampton Rd, TW11 0LW, Teddington, Middlesex, United Kingdom
| | - Andrea Cabrero-Vilatela
- Department
of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA, Cambridge, United Kingdom
| | - Carsten Baehtz
- Institute of Ion
Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - Andrew J. Pollard
- National Physical
Laboratory, Hampton Rd, TW11 0LW, Teddington, Middlesex, United Kingdom
| | - Stephan Hofmann
- Department
of Engineering, University of Cambridge, JJ Thomson Avenue, CB3 0FA, Cambridge, United Kingdom
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299
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Direction-controlled chemical doping for reversible G-phonon mixing in ABC trilayer graphene. Sci Rep 2015; 5:8707. [PMID: 25746467 PMCID: PMC4352872 DOI: 10.1038/srep08707] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 02/02/2015] [Indexed: 11/08/2022] Open
Abstract
Not only the apparent atomic arrangement but the charge distribution also defines the crystalline symmetry that dictates the electronic and vibrational structures. In this work, we report reversible and direction-controlled chemical doping that modifies the inversion symmetry of AB-bilayer and ABC-trilayer graphene. For the "top-down" and "bottom-up" hole injection into graphene sheets, we employed molecular adsorption of electronegative I2 and annealing-induced interfacial hole doping, respectively. The chemical breakdown of the inversion symmetry led to the mixing of the G phonons, Raman active Eg and Raman-inactive Eu modes, which was manifested as the two split G peaks, G(-) and G(+). The broken inversion symmetry could be recovered by removing the hole dopants by simple rinsing or interfacial molecular replacement. Alternatively, the symmetry could be regained by double-side charge injection, which eliminated G(-) and formed an additional peak, G(o), originating from the barely doped interior layer. Chemical modification of crystalline symmetry as demonstrated in the current study can be applied to other low dimensional crystals in tuning their various material properties.
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Murray DJ, Patterson DD, Payamyar P, Bhola R, Song W, Lackinger M, Schlüter AD, King BT. Large Area Synthesis of a Nanoporous Two-Dimensional Polymer at the Air/Water Interface. J Am Chem Soc 2015; 137:3450-3. [DOI: 10.1021/ja512018j] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Daniel J. Murray
- Department
of Chemistry, University of Nevada, Reno, Nevada 89557-0216, United States
| | - Dustin D. Patterson
- Department
of Chemistry, University of Nevada, Reno, Nevada 89557-0216, United States
| | - Payam Payamyar
- Laboratory of Polymer Chemistry, Institute of Polymers, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland
| | - Radha Bhola
- Department
of Chemistry, University of Nevada, Reno, Nevada 89557-0216, United States
| | - Wentao Song
- Department of Physics, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
- Deutsches Museum, Museumsinsel 1, 80538 Munich, Germany
| | - Markus Lackinger
- Department of Physics, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
- Deutsches Museum, Museumsinsel 1, 80538 Munich, Germany
| | - A. Dieter Schlüter
- Laboratory of Polymer Chemistry, Institute of Polymers, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland
| | - Benjamin T. King
- Department
of Chemistry, University of Nevada, Reno, Nevada 89557-0216, United States
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