| Title: | Gas-solid interfacial charge transfer in volatile organic compound detection by CuCrO(2)nanoparticles |
| Author(s): | Xu S; Zhao T; Kong L; Zhu W; Bo M; Huang Y; Liu H; |
| Address: | "Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai, 200072, People's Republic of China. Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China. Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM) of Chongqing, Yangtze Normal University, Chongqing 408100, People's Republic of China. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore" |
| ISSN/ISBN: | 1361-6528 (Electronic) 0957-4484 (Linking) |
| Abstract: | "Nanostructured metal oxide semiconductors have received great attention used as the chemiresistive layer of gas sensor to detect the volatile organic compound recently. As indispensable complementary parts for dominative n-type semiconductors, the p-type metal oxides based gas sensors fail to be studied sufficiently, which hampers their practical applications. In this work, the p-type delafossite CuCrO(2)nanoparticles were synthesized, characterized, and tested for gas sensing, followed by the first principles calculations to simulate the generation of chemiresistive signal. The hydrothermal synthesis time of CuCrO(2)nanoparticles is optimized as 24 h with a higher proportion of oxygen vacancies but a smaller size, which is confirmed by the microscopy and spectrum characterization and allows for a prevailing gas sensitivity. Meanwhile, this CuCrO(2)gas sensor is proven to perform a higher selectivity to n-propanol and a low detection limit of 1 ppm. The adsorption sites and charge variations of dehydrogenation at the gas-solid interface predicted by the theoretical analysis are claimed to be crucial to such selectivity. It is an innovative approach to understand the chemiresistive gas sensing by evaluating the preference of charge transfer between the sensor and target gaseous molecule, which provides a new route to precisely design and develop the advanced sensing devices for the diverse applications" |
| Keywords: | CuCrO2 gas sensor metal oxide semiconductor volatile organic compound; |
| Notes: | "PubMed-not-MEDLINEXu, Sifan Zhao, Tingting Kong, Lingwei Zhu, Wenhuan Bo, Maolin Huang, Yizhong Liu, Hai eng England 2021/04/22 Nanotechnology. 2021 May 10; 32(31). doi: 10.1088/1361-6528/abfa55" |
