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Hou S, Pang R, Chang S, Ye L, Xu J, Wang X, Zhang Y, Shang Y, Cao A. Synergistic CNFs/CoS 2/MoS 2 Flexible Films with Unprecedented Selectivity for NO Gas at Room Temperature. ACS Appl Mater Interfaces 2020; 12:29778-29786. [PMID: 32496756 DOI: 10.1021/acsami.0c05953] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Recently, room-temperature flexible gas sensors have been widely studied because they can operate without being heated and create low-cost, low-power-consumption devices with long-term stability. Here, by designing the active material composition and structure, we report an electrospun carbon nanofiber (CNF) network grafted by two-dimensional MoS2 nanosheets and embedded CoS2 nanoparticles, which serves as a flexible gas sensor for various toxic or hazardous gases working at room temperature. In particular, the CNFs/CoS2/MoS2 hybrid films exhibit very high selectivity toward NO over other gases including NO2 and CH4, with selectivity coefficients (|SNO/SNO2| and |SNO/SCH4|) as high as 43 and 42 (defined as the ratio of responses between two gases). The sensor shows a linear relationship in the gas concentration range of 1-100 ppm and a stable response during repeated bending. Theoretical calculations suggest that MoS2 can be selectively n-doped by NO, while CoS2 can effectively capture NO molecules, leading to enhanced selectivity and sensitivity. Our large-area flexible sensors made by synergistic design have potential applications in biological and environmental areas for low-cost, selective detection of toxic or targeted gases.
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Affiliation(s)
- Siyu Hou
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Rui Pang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Shulong Chang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Li Ye
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Jie Xu
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Xinchang Wang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Yingjiu Zhang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Yuanyuan Shang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, PR China
| | - Anyuan Cao
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, PR China
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