The performance of the gas sensor was characterized with CGS-MT, an optoelectronics gas sensor test platform produced by Beijing Sino Aggtech Co., Ltd. (Beijing, China). A gas chamber with an optically polished quartz window was used to investigate the effect of light illumination on the performance of the gas sensor. The standard gas including NO2, CH2O, CO and NH3 was purchased from Shanghai Weichuang Standard Gas Analytical Technology Co., Ltd. (Shanghai, China). The test gas was calibrated according to the standard of GB/T5274-1-2018 (Gas analysis—Preparation of calibration gas mixtures—Part 1: Gravimetric method for Class I mixtures). The gravimetric method is an internationally recognized calibration method. The purchased standard gas was prepared by the gravimetric method. The test gas with various concentrations can be obtained by varying the concentration of the purchased standard gas using compressed dry air as carrier gas. Two mass flow controllers were used to mix different gases.

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