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Spin-Resolved Visible Optical Spectra and Electronic Characteristics of Defect-Mediated Hexagonal Boron Nitride Monolayer. CRYSTALS 2022. [DOI: 10.3390/cryst12070906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Defect-mediated hexagonal boron nitride (hBN) supercells display visible optical spectra and electronic characteristics. The defects in the hBN supercells included atomic vacancy, antisite, antisite vacancy, and the substitution of a foreign atom for boron or nitrogen. The hBN supercells with VB, CB, and NB-VN were characterized by a high electron density of states across the Fermi level, which indicated high conductive electronic characteristics. The hBNs with defects including atomic vacancy, antisite at atomic vacancy, and substitution of a foreign atom for boron or nitride exhibited distinct spin-resolved optical and electronic characteristics, while defects of boron and nitrogen antisite did not display the spin-resolved optical characteristics. The hBNs with positively charged defects exhibited dominant optical and electronic characteristics in the longer spectral region. Acknowledgment: This work at HU is supported by ARO W911NF-15-1-0535, NSF HRD-1137747, and NASA NNX15AQ03A.
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Ma W, Yao B, Yang Q, Zhang T, Tian K, Zhang W, Niu J, Yu Y, Chang Z, He Y. Synergetic contribution of enriched selenium vacancies and out-of-plane ferroelectric polarization in AB-stacked MoSe 2 nanosheets as efficient piezocatalysts for TC degradation. NEW J CHEM 2022. [DOI: 10.1039/d1nj05579h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel MoSe2 piezocatalysts with surface selenium vacancies and out-of-plane ferroelectric polarization exhibit ultrafast degradation of the antibiotic tetracycline.
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Affiliation(s)
- Wei Ma
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
- The key Laboratory of Northwest Water Resources and Environmental Ecology of Ministry of Education, Xi’an University of Technology, Xi’an 710048, China
| | - Binghua Yao
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
- The key Laboratory of Northwest Water Resources and Environmental Ecology of Ministry of Education, Xi’an University of Technology, Xi’an 710048, China
| | - Qian Yang
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
| | - Ting Zhang
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
| | - Kecong Tian
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
| | - Wen Zhang
- Department of Civil Engineering, University of Arkansas, Fayetteville 72701, USA
| | - Jinfen Niu
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
| | - Yan Yu
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
| | - Zheng Chang
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
| | - Yangqing He
- Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
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Ye H, Shi C, Li J, Tian L, Zeng M, Wang H, Li Q. New Alternating Current Noise Analytics Enables High Discrimination in Gas Sensing. Anal Chem 2019; 92:824-829. [PMID: 31820624 DOI: 10.1021/acs.analchem.9b03312] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Feature analysis has been increasingly considered as an important way to enhance the discrimination performance of gas sensors. In this work, a new analytical method based on alternating current noise spectrum is developed to discriminate chemically and structurally similar gases with remarkable performance. Compared with the conventional analytics based on the maximum, integral, and time of response, the noise spectrum of electrical response introduces a new informative feature to discriminate chemical gases. In experiment, three chemically and structurally similar gases, mesitylene, toluene, and o-xylene, are tested on ZnO thin film gas sensors. The result indicated that the noise analytics assisted by the support vector machine algorithm discriminated these similar gases with 94.2% in precision, about 20% higher than those obtained by conventional methods. Such a new alternating current noise analytics is very promising for application in sensors for high discrimination precision.
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Affiliation(s)
- Huixian Ye
- Department of Electrical and Computer Engineering , George Mason University , Fairfax , Virginia 22030 , United States.,Bright Dream Robotics , Foshan , Guangdong 528300 , China.,Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201210 , China
| | - Chen Shi
- Department of Electrical and Computer Engineering , George Mason University , Fairfax , Virginia 22030 , United States
| | - Jiang Li
- Bright Dream Robotics , Foshan , Guangdong 528300 , China
| | - Li Tian
- Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201210 , China
| | - Min Zeng
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Hui Wang
- Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201210 , China
| | - Qiliang Li
- Department of Electrical and Computer Engineering , George Mason University , Fairfax , Virginia 22030 , United States
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Han JK, Kang MA, Park CY, Lee M, Myung S, Song W, Lee SS, Lim J, An KS. Attachable piezoelectric nanogenerators using collision-induced strain of vertically grown hollow MoS 2 nanoflakes. NANOTECHNOLOGY 2019; 30:335402. [PMID: 31026842 DOI: 10.1088/1361-6528/ab1d06] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Piezoelectric materials convert external mechanical force into electrical energy, due to the breaking of the centrosymmetry of the atomic structure. Piezoelectricity-based nano-generators (PNGs) based on two-dimensional transition metal dichalcogenides (TMDs) can generate electrical energy stably by the piezoelectric effect at their nanoscale thickness. However, the commercialization of TMD-based PNGs is limited by their poor piezoelectric performance and microscale energy harvesting. Here, we present the first centimeter-scale PNGs based on molybdenum disulfide (MoS2) nanosheets with vertically grown hollow MoS2 nanoflakes (v-MoS2 NFs) obtained by chemical vapor deposition for energy harvesting from human motions. The collision of v-MoS2 NFs with a preferred odd-atomic-layer number and their 2H antiparallel phase leads to efficient electrical energy generation during the bending movement. Further, basal MoS2 films with v-MoS2 NFs are transferred onto flexible substrates via conventional polymer-assisted methods for the fabrication of attachable and wearable piezoelectric power generators.
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Affiliation(s)
- Jin Kyu Han
- Thin Film Materials Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea
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Zha Q, Xu W, Li X, Ni Y. Chlorine-doped α-Co(OH)2 hollow nano-dodecahedrons prepared by a ZIF-67 self-sacrificing template route and enhanced OER catalytic activity. Dalton Trans 2019; 48:12127-12136. [DOI: 10.1039/c9dt02141h] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A ZIF-67-self-sacrificing template strategy was designed for the synthesis of undoped/Cl-doped α-Co(OH)2 hollow nano-dodecahedrons with enhanced OER performance.
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Affiliation(s)
- Qingqing Zha
- College of Chemistry and Materials Science
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Anhui Key Laboratory of Functional Molecular Solids
| | - Wenyan Xu
- College of Chemistry and Materials Science
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Anhui Key Laboratory of Functional Molecular Solids
| | - Xiaolei Li
- College of Chemistry and Materials Science
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Anhui Key Laboratory of Functional Molecular Solids
| | - Yonghong Ni
- College of Chemistry and Materials Science
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Laboratory of Molecule-Based Materials
- Anhui Key Laboratory of Functional Molecular Solids
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Yu S, Rice Q, Tabibi B, Li Q, Seo FJ. Piezoelectricity in WSe 2/MoS 2 heterostructure atomic layers. NANOSCALE 2018; 10:12472-12479. [PMID: 29926873 DOI: 10.1039/c8nr04394a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A two-dimensional heterostructure of WSe2/MoS2 atomic layers has unique piezoelectric characteristics which depend on the number of atomic layers, stacking type and interlayer interaction size. The van der Waals heterostructure of p- and n-type TMDC atomic layers with different work functions forms a type-II staggered gap alignment. The large band offset of the conduction band minimum and the valence band maximum between p-type WSe2 and n-type MoS2 atomic layers leads to large electric polarization and piezoelectricity. The output voltages for a MoS2/WSe2 partial vertical heterostructure with a size of 3.0 nm × 1.5 nm were 0.137 V and 0.183 V under 4% and 8% tensile strains, respectively. The output voltage of an AB-stacking MoS2/WSe2 heterostructure was larger than that of an AA-stacking heterostructure under 4% tensile strain due to the contribution of intrinsic piezoelectricity and symmetric out-of-plane conditions. The AB-stacking has a lower formation energy and better structural stability compared to AA-stacking. The large output voltage of nanoscale partial or full vertical heterostructures of 2D WSe2/MoS2 atomic layers in addition to the increased output voltage through the series connection of multiple nanoscale piezoelectric devices will enable the realization of nano-electromechanical systems (NEMS) with TMDC heterostructure atomic layers.
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Affiliation(s)
- Sheng Yu
- Advanced Center for Laser Science and Spectroscopy, Department of Physics, Hampton University, Hampton, VA 23668, USA.
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Kou Y, Liu J, Li Y, Qu S, Ma C, Song Z, Han X, Deng Y, Hu W, Zhong C. Electrochemical Oxidation of Chlorine-Doped Co(OH) 2 Nanosheet Arrays on Carbon Cloth as a Bifunctional Oxygen Electrode. ACS APPLIED MATERIALS & INTERFACES 2018; 10:796-805. [PMID: 29240400 DOI: 10.1021/acsami.7b17002] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The primary challenge of developing clean energy conversion/storage systems is to exploit an efficient bifunctional electrocatalyst both for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with low cost and good durability. Here, we synthesized chlorine-doped Co(OH)2 in situ grown on carbon cloth (Cl-doped Co(OH)2) as an integrated electrode by a facial electrodeposition method. The anodic potential was then applied to the Cl-doped Co(OH)2 in an alkaline solution to remove chlorine atoms (electro-oxidation (EO)/Cl-doped Co(OH)2), which can further enhance the electrocatalytic activity without any thermal treatment. EO/Cl-doped Co(OH)2 exhibits a better performance both for ORR and OER in terms of activity and durability because of the formation of a defective structure with a larger electrochemically active surface area after the electrochemical oxidation. This approach provides a new idea for introducing defects and developing active electrocatalyst.
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Affiliation(s)
- Yue Kou
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Jie Liu
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Yingbo Li
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Shengxiang Qu
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Chao Ma
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Zhishuang Song
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Xiaopeng Han
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Yida Deng
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Wenbin Hu
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Cheng Zhong
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
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