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Li X, Hu H, Tan T, Sun M, Bao Y, Huang Z, Muhammad S, Xia X, Gao Y. Enhancing Methane Gas Sensing through Defect Engineering in Ag-Ru Co-doped ZnO Nanorods. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26395-26405. [PMID: 38728440 DOI: 10.1021/acsami.4c03252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
Detection of leaks of flammable methane (CH4) gas in a timely manner can mitigate health, safety, and environmental risks. Zinc oxide (ZnO), a polar semiconductor with controllable surface defects, is a promising material for gas sensing. In this study, Ag-Ru co-doped into self-assembled ZnO nanorod arrays (ZnO NRs) was prepared by a one-step hydrothermal method. The Ag-Ru co-doped sample shows a good hydrophobic property as a result of its particular microstructure, which results in high humidity resistance. In addition, oxygen vacancy density significantly increased after Ag-Ru co-doping. Density functional theory (DFT) calculations revealed an exceptionally high charge density accumulated at the Ru sites and the formation of a localized strong electric field, which provides additional energy for the CH4 reaction with •O2- at the surface at room temperature. Optimized AgRu0.025-ZnO demonstrated an outstanding CH4 sensing performance, with a limit of detection (LOD) as low as 2.24 ppm under free-heat and free-light conditions. These findings suggest that introducing defects into the ZnO lattice, such as oxygen vacancies and localized ions, offers a promising approach to improving the gas sensing performance.
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Affiliation(s)
- Xun Li
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Hui Hu
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Tian Tan
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Mengjing Sun
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Yuwen Bao
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Zhongbing Huang
- School of Physics, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Sohail Muhammad
- Department of Natural Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M15 6BH, United Kingdom
| | - Xiaohong Xia
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
| | - Yun Gao
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan, Hubei 430062, People's Republic of China
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Rathnasekara R, Hari P. Enhancing the Efficiency of Dye‐Sensitized Solar Cells (DSSCs) by Nanostructured Ag‐doped ZnO Electrodes. ChemistrySelect 2022. [DOI: 10.1002/slct.202200830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rusiri Rathnasekara
- Department of Physics and Engineering Physics University of Tulsa Tulsa Oklahoma 74104 USA
| | - Parameswar Hari
- Department of Physics and Engineering Physics University of Tulsa Tulsa Oklahoma 74104 USA
- Oklahoma Photovoltaic Research Institute University of Tulsa Tulsa Oklahoma 74104 USA
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Khan FU, Mehmood S, Liu S, Xu W, Shah MN, Zhao X, Ma J, Yang Y, Pan X. A p-n Heterojunction Based Pd/PdO@ZnO Organic Frameworks for High-Sensitivity Room-Temperature Formaldehyde Gas Sensor. Front Chem 2021; 9:742488. [PMID: 34616714 PMCID: PMC8489732 DOI: 10.3389/fchem.2021.742488] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/01/2021] [Indexed: 11/13/2022] Open
Abstract
As formaldehyde is an extremely toxic volatile organic pollutant, a highly sensitive and selective gas sensor for low-concentration formaldehyde monitoring is of great importance. Herein, metal-organic framework (MOF) derived Pd/PdO@ZnO porous nanostructures were synthesized through hydrothermal method followed by calcination processes. Specifically, porous Pd/PdO@ZnO nanomaterials with large surfaces were synthesized using MOFs as sacrificial templates. During the calcination procedure, an optimized temperature of 500°C was used to form a stable structure. More importantly, intensive PdO@ZnO inside the material and composite interface provides lots of p-n heterojunction to efficiently manipulate room temperature sensing performance. As the height of the energy barrier at the junction of PdO@ZnO exponentially influences the sensor resistance, the Pd/PdO@ZnO nanomaterials exhibit high sensitivity (38.57% for 100 ppm) at room temperature for 1-ppm formaldehyde with satisfactory selectivity towards (ammonia, acetone, methanol, and IPA). Besides, due to the catalytic effect of Pd and PdO, the adsorption and desorption of the gas molecules are accelerated, and the response and recovery time is as small as 256 and 264 s, respectively. Therefore, this MOF-driven strategy can prepare metal oxide composites with high surface area, well-defined morphology, and satisfactory room-temperature formaldehyde gas sensing performance for indoor air quality control.
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Affiliation(s)
- Faheem Ullah Khan
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Shahid Mehmood
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Shiliang Liu
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Wei Xu
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Muhammad Naeem Shah
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Xiaojin Zhao
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Junxian Ma
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Yatao Yang
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
| | - Xiaofang Pan
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen, China
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Huang Y, Shao Y, Bai Y, Yuan Q, Ming T, Davies P, Lu X, de Richter R, Li W. Feasibility of Solar Updraft Towers as Photocatalytic Reactors for Removal of Atmospheric Methane-The Role of Catalysts and Rate Limiting Steps. Front Chem 2021; 9:745347. [PMID: 34568287 PMCID: PMC8461309 DOI: 10.3389/fchem.2021.745347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 08/25/2021] [Indexed: 11/13/2022] Open
Abstract
Due to the alarming speed of global warming, greenhouse gas removal from atmosphere will be absolutely necessary in the coming decades. Methane is the second most harmful greenhouse gas in the atmosphere. There is an emerging technology proposed to incorporating photocatalysis with solar updraft Towers (SUT) to remove methane from the air at a planetary scale. In this study, we present a deep analysis by calculating the potential of methane removal in relation to the dimensions and configuration of SUT using different photocatalysts. The analysis shows that the methane removal rate increases with the SUT dimensions and can be enhanced by changing the configuration design. More importantly, the low methane removal rate on conventional TiO2 photocatalyst can be significantly improved to, for example, 42.5% on a more effective Ag-doped ZnO photocatalyst in a 200 MW SUT while the photocatalytic reaction is the rate limiting step. The factors that may further affect the removal of methane, such as more efficient photocatalysts, night operation and reaction zone are discussed as possible solutions to further improve the system.
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Affiliation(s)
- Yanfang Huang
- Department of Chemical and Biological Engineering, Nantong Vocational University, Nantong, China
| | - Yimin Shao
- Institute for Materials and Processes, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - Yang Bai
- Institute for Materials and Processes, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
| | - Qingchun Yuan
- School of Engineering and Applied Science, Aston University, Birmingham, United Kingdom
| | - Tingzhen Ming
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China
| | - Philip Davies
- School of Engineering, University of Birmingham, Birmingham, United Kingdom
| | - Xiaohua Lu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, China
| | | | - Wei Li
- Institute for Materials and Processes, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom
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Chen Y, Lu P, Li Z, Yuan Y, Zhang H. Side-chain chiral fluorescent liquid crystal polymers with highly efficient circularly polarized luminescence emission in a glassy-state SmC* film. Polym Chem 2021. [DOI: 10.1039/d1py00199j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A series of high-efficiency CPL-active homopolymer materials in solid films with modulated properties were fabricated.
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Affiliation(s)
- Youde Chen
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Peng Lu
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Zhiyan Li
- Beijing National Laboratory for Molecular Sciences
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Yongjie Yuan
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Hailiang Zhang
- Key Laboratory of Polymeric Materials and Application Technology of Hunan Province
- Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
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de Almeida JC, Corrêa MT, Koga RH, Del Duque DMS, Lopes OF, da Silva GTST, Ribeiro C, de Mendonça VR. Crystallization time in ZnO: the role of surface OH groups in its photoactivity. NEW J CHEM 2020. [DOI: 10.1039/d0nj03239e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The crystallization time and surface modifications concerning the hydroxyl groups on the ZnO catalyst were studied and the results suggest that there is a balance between the surface groups and morphology playing a critical role in its photoactivity.
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Affiliation(s)
- Jéssica C. de Almeida
- Federal University of São Carlos
- Science and Technology Center for Sustainability
- Sorocaba
- Brazil
| | - Mateus T. Corrêa
- Federal University of São Carlos
- Science and Technology Center for Sustainability
- Sorocaba
- Brazil
| | - Rafaella H. Koga
- Federal Institute of Education, Science, and Technology of São Paulo – IFSP Campus Itapetininga
- Itapetininga
- Brazil
| | - Douglas M. S. Del Duque
- Federal Institute of Education, Science, and Technology of São Paulo – IFSP Campus Itapetininga
- Itapetininga
- Brazil
| | - Osmando F. Lopes
- Laboratory of Photochemistry and Materials Science
- Federal University of Uberlândia
- Institute of Chemistry
- Uberlândia
- Brazil
| | - Gelson T. S. T. da Silva
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
| | - Caue Ribeiro
- Nanotechnology National Laboratory for Agriculture (LNNA)
- Embrapa Instrumentation
- São Carlos
- Brazil
| | - Vagner R. de Mendonça
- Federal University of São Carlos
- Science and Technology Center for Sustainability
- Sorocaba
- Brazil
- Federal Institute of Education, Science, and Technology of São Paulo – IFSP Campus Itapetininga
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