期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 363, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.131853
关键词
TeO2 nanowire; a-C-decoration; NO2 gas; DFT calculations; Gas sensor
资金
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Education [NRF-2016R1A6A1A03013422]
- National Research Foundation of Korea (NRF) - Korean Government (MSIT) [NRF-2021R1A2C1009790]
- Korea Polar Research Institute
In this study, we enhanced the sensing performance of TeO2 by depositing amorphous carbon (a-C) on its surface. The a-C-decorated sensor exhibited a lower optimized sensing temperature, higher sensitivity to NO2 gas, and outstanding selectivity. The findings were further confirmed through density functional theory (DFT) calculations.
TeO2 is a semiconducting metal oxide that is not popular for sensing studies due to its poor sensing performance in its pristine form. To enhance its sensing performance, we deposited amorphous carbon (a-C) on its surface. We first synthesized TeO2 nanowires using a thermal evaporation method, and then we deposited an a-C layer on them by a simple procedure using a flame carbon vapor deposition technique. We showed that the a-C-decorated sensor had a lower optimized sensing temperature (26 degrees C) relative to the pristine TeO2 sensor (50 degrees C) and presented a higher sensitivity to NO2 gas. The maximum responses to NO2 (10 ppm) were 1.918 and 1.468 for a-C-decorated and pristine TeO2 nanowires, respectively. Furthermore, the a-C-decorated sensor indicated outstanding selectivity toward NO2. The high performance of a-C-decorated sensor was results of its higher surface area created by the bumpy carbon layer on the surface of TeO2 nanowires as well as the electronic sensitization due to the a-C layer. We also confirmed NO2 sensing behaviors of bare and a-C-decorated TeO2 nanowires using density functional theory (DFT) calculations, where calculated binding energies between NO2 and the sensing layer were stronger for NO2 and a-C-decorated TeO2 nanowire gas sensor relative to pristine gas sensors. The present approach for enhancing the sensing of TeO2 nanowires can be extended to other sensor systems as a simple, inexpensive strategy to improve sensor performance.
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