Novel metal oxides partially derived perovskite-structured hydroxides for room temperature trace NO2 gas sensors under UV irradiation

Zhiguang Pan; Hao Huang; Yanwei Wang; Tianqi Wang; Hui Yu; Qianli Ma; Xiangting Dong; Ying Yang

doi:10.1016/j.talanta.2024.127449

Novel metal oxides partially derived perovskite-structured hydroxides for room temperature trace NO₂ gas sensors under UV irradiation

Talanta. 2024 Dec 20:286:127449. doi: 10.1016/j.talanta.2024.127449. Online ahead of print.

Authors

Zhiguang Pan¹, Hao Huang¹, Yanwei Wang¹, Tianqi Wang¹, Hui Yu¹, Qianli Ma¹, Xiangting Dong¹, Ying Yang²

Affiliations

¹ Key Laboratory of Applied Chemistry and Nanotechnology at University of Jilin Province, Changchun University of Science and Technology, Changchun, 130022, China.
² Key Laboratory of Applied Chemistry and Nanotechnology at University of Jilin Province, Changchun University of Science and Technology, Changchun, 130022, China. Electronic address: yangying0807@126.com.

PMID: 39724855
DOI: 10.1016/j.talanta.2024.127449

Abstract

Perovskite-structured materials are used as gas-sensitive materials due to their wide bandgap and controllable morphology, but large initial resistance and low response limit their development. In this work, ZnSn(OH)₆/ZnO composites derived from ZnO were synthesized by hydrothermal method. The gas-sensitive results show that all sensors show significantly improved response to NO₂ under UV irradiation compared with without UV irradiation. Notably, under UV irradiation the operating temperatures of sensors are reduced from 110 °C to room temperature and have a low initial resistance. Compared with bare ZnO, the ZnSn(OH)₆/ZnO-7 sensor shows a 4.4-fold improvement in response to 10 ppm NO₂ under UV irradiation at room temperature and has response/recovery time (54.5/74 s). Meanwhile, the ZnSn(OH)₆/ZnO-7 sensor has a practical detection limit of 50 ppb and a theoretical detection limit of 9.86 ppb, which enable efficient detection of trace NO₂. The excellent gas-sensitive performance of the ZnSn(OH)₆/ZnO sensors can be attributed to the highly efficient photogenerated carrier separation efficiency, the special morphology, high oxygen vacancy content and the construction of numerous heterostructures. Therefore, the ZnSn(OH)₆/ZnO sensors provide insights into the realization of high-performance perovskite-structured NO₂ sensors under UV irradiation at room temperature.

Keywords: Metal oxides; NO(2) gas sensors; Perovskite-structured hydroxides; UV irradiation.