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1
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Ahn B, Kim Y, Kim M, Yu HM, Ahn J, Sim E, Ji H, Gul HZ, Kim KS, Ihm K, Lee H, Kim EK, Lim SC. One-Step Passivation of Both Sulfur Vacancies and SiO 2 Interface Traps of MoS 2 Device. NANO LETTERS 2023; 23:7927-7933. [PMID: 37647420 DOI: 10.1021/acs.nanolett.3c01753] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Transition metal dichalcogenides (TMDs) benefit electrical devices with spin-orbit coupling and valley- and topology-related properties. However, TMD-based devices suffer from traps arising from defect sites inside the channel and the gate oxide interface. Deactivating them requires independent treatments, because the origins are dissimilar. This study introduces a single treatment to passivate defects in a multilayer MoS2 FET. By applying back-gate bias, protons from an H-TFSI droplet are injected into the MoS2, penetrating deeply enough to reach the SiO2 gate oxide. The characterizations employing low-temperature transport and deep-level transient spectroscopy (DLTS) studies reveal that the trap density of S vacancies in MoS2 drops to the lowest detection level. The temperature-dependent mobility plot on the SiO2 substrate resembles that of the h-BN substrate, implying that dangling bonds in SiO2 are passivated. The carrier mobility on the SiO2 substrate is enhanced by approximately 2200% after the injection.
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Affiliation(s)
- Byungwook Ahn
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Yoonsok Kim
- Department of Physics, Hanyang University, Seoul 04763, Republic of Korea
- Institute of Plasma Technology, Korea Institute of Fusion Energy, Gunsan 54004, Republic of Korea
| | - Meeree Kim
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyang Mi Yu
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Jaehun Ahn
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Eunji Sim
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyunjin Ji
- Department of Electrical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Hamza Zad Gul
- Department of Electrical Engineering, Namal University, 30 km Talagang Road, Mianwali 42250, Pakistan
| | - Keun Soo Kim
- Department of Physics and Graphene Research Institute, Sejong University, Seoul 05006, Republic of Korea
| | - Kyuwook Ihm
- Nano & Interface Research Team, Pohang Accelerator Laboratory, Pohang 37673, Republic of Korea
| | - Hyoyoung Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Eun Kyu Kim
- Department of Physics, Hanyang University, Seoul 04763, Republic of Korea
| | - Seong Chu Lim
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Smart Fabrication Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
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2
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Li X, Bai H, Wang Q, Zhao Y, Feng J, Li D. Opening up a Radical Cross-Coupling Etherification Path by a Defect-Rich Cu/ZrO 2 Catalyst for a High-Value Transformation of HMF. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiumin Li
- State Key Laboratory of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
- Engineering Laboratory of Chemical Resource Utilization in Southern Xinjiang of Corps, Tarim University, Alar, Xinjiang 843300, People’s Republic of China
| | - Hongjin Bai
- Engineering Laboratory of Chemical Resource Utilization in Southern Xinjiang of Corps, Tarim University, Alar, Xinjiang 843300, People’s Republic of China
| | - Qian Wang
- State Key Laboratory of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Yang Zhao
- State Key Laboratory of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Junting Feng
- State Key Laboratory of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Dianqing Li
- State Key Laboratory of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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3
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Liu B, Yang Y, Tan Q, Zhou K, Xu X, Ding Y, Han Y, Fan X, Tao R. Cr doped Mn3O4 thermal catalytic isopropanol degradation at low-temperature and catalytic mechanism research. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Guo T, Cheng G, Tan G, Xu L, Huang Z, Cheng P, Zhou Z. Real-time analysis of intermediate products from non-thermal plasma degradation of ethyl acetate in air using PTR-MS: Performance evaluation and mechanism study. CHEMOSPHERE 2021; 264:128430. [PMID: 33002801 DOI: 10.1016/j.chemosphere.2020.128430] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/17/2020] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
Non-thermal plasma (NTP) has developed into an emerging end-of-pipe technology for treating volatile organic compounds (VOCs) present in unhygienic point source of air streams. In this work, NTP oxidation of low-concentration ethyl acetate was performed in a coaxial double dielectric barrier discharge reactor. The effects of initial ethyl acetate concentration, gas flow rate, and external electrode length on ethyl acetate degradation were systematically investigated as a function of discharge power. In addition, detailed real-time and online proton transfer reaction mass spectrometry analysis was used to identify the transient species formation and transition in the various NTP oxidation periods of ethyl acetate. Based on the analysis of organic by-products, the degradation mechanism was speculated and the major reaction channels were presented. This study would deepen the understanding of plasma degradation of VOCs and reveal the plasma-chemical mechanism.
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Affiliation(s)
- Teng Guo
- Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China; Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou, 510632, China
| | - Guoxing Cheng
- Guangzhou Hexin Instrument Co., Ltd., Guangzhou, 510530, China
| | - Guobin Tan
- Guangzhou Hexin Instrument Co., Ltd., Guangzhou, 510530, China
| | - Li Xu
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Zhengxu Huang
- Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China; Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou, 510632, China
| | - Ping Cheng
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
| | - Zhen Zhou
- Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China; Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou, 510632, China
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5
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Wu S, Ishisone K, Sheng Y, Manuputty MY, Kraft M, Xu R. TiO 2 with controllable oxygen vacancies for efficient isopropanol degradation: photoactivity and reaction mechanism. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00417d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Flame-synthesized TiO2−x with controllable defects exhibits a remarkable photooxidation efficiency of gaseous isopropanol with the reaction mechanism investigated.
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Affiliation(s)
- Shuyang Wu
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
- Singapore 637459
- Singapore
- C4T CREATE
| | - Kana Ishisone
- Department of Materials Science and Engineering
- Graduate School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Yuan Sheng
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
- Singapore 637459
- Singapore
- C4T CREATE
| | - Manoel Y. Manuputty
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
- Singapore 637459
- Singapore
- C4T CREATE
| | - Markus Kraft
- C4T CREATE
- National Research Foundation
- Singapore 138602
- Singapore
- Department of Chemical Engineering and Biotechnology
| | - Rong Xu
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
- Singapore 637459
- Singapore
- C4T CREATE
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6
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An Z, Ma H, Han H, Huang Z, Jiang Y, Wang W, Zhu Y, Song H, Shu X, Xiang X, He J. Insights into the Multiple Synergies of Supports in the Selective Oxidation of Glycerol to Dihydroxyacetone: Layered Double Hydroxide Supported Au. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02844] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Zhe An
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Honghao Ma
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Hongbo Han
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Zeyu Huang
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Yitao Jiang
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Wenlong Wang
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Yanru Zhu
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Hongyan Song
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xin Shu
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xu Xiang
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Jing He
- State Key Laboratory of Chemical Resource Engineering & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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Christensen PA, Mashhadani ZTAW, Md Ali AHB, Manning DAC, Carroll MA, Martin PA. An in situ FTIR study of the plasma- and thermally-driven reaction of isopropyl alcohol at CeO2: evidence for a loose transition state involving Ce3+? Phys Chem Chem Phys 2019; 21:1354-1366. [DOI: 10.1039/c8cp05983g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper reports on the thermally-driven and non-thermal plasma-driven reaction of IsoPropyl Alcohol (IPA) on ceria (CeO2) with the aim to investigate the differences between plasma catalytic interactions and the analogous thermal reactions.
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Affiliation(s)
- P. A. Christensen
- School of Engineering
- Newcastle University
- Bedson Building
- Newcastle upon Tyne
- UK
| | | | | | - D. A. C. Manning
- School of Engineering
- Newcastle University
- Bedson Building
- Newcastle upon Tyne
- UK
| | - M. A. Carroll
- School of Natural and Environmental Sciences
- Bedson Building
- Newcastle University
- Newcastle upon Tyne
- UK
| | - P. A. Martin
- School of Chemical Engineering and Analytical Science
- The University of Manchester
- Manchester
- UK
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8
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Abstract
In the context of coupling nonthermal plasmas with catalytic materials, CeO2 is used as adsorbent for toluene and combined with plasma for toluene oxidation. Two configurations are addressed for the regeneration of toluene saturated CeO2: (i) in plasma-catalysis (IPC); and (ii) post plasma-catalysis (PPC). As an advanced oxidation technique, the performances of toluene mineralization by the plasma-catalytic systems are evaluated and compared through the formation of CO2. First, the adsorption of 100 ppm of toluene onto CeO2 is characterized in detail. Total, reversible and irreversible adsorbed fractions are quantified. Specific attention is paid to the influence of relative humidity (RH): (i) on the adsorption of toluene on CeO2; and (ii) on the formation of ozone in IPC and PPC reactors. Then, the mineralization yield and the mineralization efficiency of adsorbed toluene are defined and investigated as a function of the specific input energy (SIE). Under these conditions, IPC and PPC reactors are compared. Interestingly, the highest mineralization yield and efficiency are achieved using the in-situ configuration operated with the lowest SIE, that is, lean conditions of ozone. Based on these results, the specific impact of RH on the IPC treatment of toluene adsorbed on CeO2 is addressed. Taking into account the impact of RH on toluene adsorption and ozone production, it is evidenced that the mineralization of toluene adsorbed on CeO2 is directly controlled by the amount of ozone produced by the discharge and decomposed on the surface of the coupling material. Results highlight the key role of ozone in the mineralization process and the possible detrimental effect of moisture.
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