P1GS.20 - An ultrasensitive and humidity resistant NO2 gas sensor based on BP-BV composite film at room temperature
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-1 - Gas Sensors
- R. Hao, Z. Yong, G. Yongcai - Key Laboratory of Optoelectronic Technology and Systems of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing (China)
- 557 - 557
In this paper, black phosphorus (BP) based thin film serving as a sensing layer was prepared for trace-level nitrogen dioxide (NO2) gas detection within different relative humidities (R.H.). Meanwhile, multiple characterization techniques containing TEM, XRD, XPS and Raman were employed to auxiliarily unveil the gas-sensing mechanism. Benzyl viologen (BV), owning one of the highest reduction potentials of all electron donor organic compounds, was incorporated into BP flakes, and thus resulted in a sensing response of 86% toward 100 ppb NO2 at 40% RH, which was nearly 400% enhanced in comparison with bare BP one. Furthermore, we investigated the role of BP or BV material in the sensing performance. It was concluded that the composites showed a high sensitivity toward trace NO2 gas, and the humidity posed a negligible effect on NO2 sensing.