Enhancing NO2 sensing performance through interface engineering in Cs2AgBiBr6/SnO2/ZnO-NRs sensor

Wang, Shifeng, Hu, Hui, Tan, Tian, Li, Xun, Zhou, Wanling, Tian, Zhanyou, Bao, Yuwen, Homewood, KP, Muhammad, Sohail, Xia, Xiaohong and Gao, Yun (2025) Enhancing NO2 sensing performance through interface engineering in Cs2AgBiBr6/SnO2/ZnO-NRs sensor. Sensors and Actuators B: Chemical, 422. 136654. ISSN 0925-4005

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Abstract

Developing sensors that operate under ambient conditions with minimal energy consumption, ensuring a robust response and efficient recovery to toxic NO2 gas, can help take appropriate and corrective measures to protect human health from exposure to hazardous environments. In this study, we have successfully designed a gas sensor device based on a sandwich structure of Cs2AgBiBr6/SnO2/ZnO-nanorods (CABB/SnO2/ZnO-NRs) for detecting NO2 at room temperature. The insertion of the SnO2 layer between the CABB and ZnO-NRs, which works as a hole blocker, not only improves significantly the sensor stability from a few hours to more than a month but also offers the energy step for electron transfer from ZnO-NRs to CABB. The CABB layer further enhances the charge separation, transport, and conductivity from the perovskite to the ZnO surface, actively participating in the gas-sensitive reaction. The response of CABB/SnO2/ZnO-NRs sensors to 100 ppm NO2 is about 9 times higher than that of ZnO-NRs, showing a significantly improved NO2 sensing performance.