| Enhanced NO2 gas sensing performance of microwave irradiated SnO2-ZnO nanocomposites prepared by a rotational hydrothermal method |
| Jiyeon Shin1, Jeong Yun Hwang2, Changyu Kim3, Jimyeong Park3, Ali Mirzaei4, Jong Wook Roh1,3, Se Hun Lee5, Changhyun Jin2, Myung Sik Choi1,3 |
1School of Advanced Science and Technology Convergence, Kyungpook National University, Sangju, 37224, Republic of Korea
2Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
3Department of Nano and Advanced Materials Science and Engineering, Kyungpook National University, Sangju, 37224, Republic of Korea
4Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, 71555‐313, Iran
5Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea |
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Received: September 14, 2024; Revised: December 27, 2024 Accepted: January 19, 2025. Published online: February 6, 2025. |
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| ABSTRACT |
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In this work, we investigated the effects of microwave (MW) irradiation and the rotational hydrothermal method on SnO2-ZnO nanocomposites for NO2 gas detection by comparing commercial SnO2 nanoparticles (NPs), SnO2-ZnO nanocomposites, and MW-irradiated SnO2-ZnO nanocomposites. Initially, a novel rotational hydrothermal method, involving exposure to temperatures of 180 °C for 24 h, was used to synthesize SnO2-ZnO nanocomposites, which were then subjected to MW irradiation in 30 s intervals for a total of 10 cycles. The crystalline phase, morphology, chemical composition, physical effects of MW irradiation, and oxygen vacancies of the nanocomposite synthesized were thoroughly analyzed for the first time using MW irradiation and rotational hydrothermal methods. At 250 °C, the MW irradiated sensor recorded a response of 62.1 to 10 ppm NO2 gas and response and recovery times of 257 s and 57 s, respectively. Furthermore, the sensor demonstrated high long-term stability and high selectivity to NO2 gas. The improved NO2 performance of the optimized sensor was related to the physical effects of MW irradiation and oxygen vacancies as well as the formation of ZnO-SnO2 heterojunctions. We successfully presented a novel synthesis route for the preparation of nanocomposites and demonstrated the strong effect of MW irradiation on NO2 sensing performance. |
| Key words:
SnO2-ZnO composite · Rotational hydrothermal method · MW irradiation · NO2 gas |
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