GS2.4 - UV light enhanced room temperature NO2 gas sensors based on Au loaded organic-inorganic hybrid perovskite incorporated with tin dioxide

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
Gas Sensors 2
Y. Chen, X. Zhang, X. Wang, J. Xu - NEST Lab, Department of chemistry, College of Science, Shanghai University, Shanghai (China)
101 - 102


A novel NO2 sensing material Au/MASnI3/ SnO2 was fabricated by coupling a light-sensitive material, Au decorated organic-inorganic hybrid perovskite (Au/MASnI3), with a wide band gap gas sensing semiconductor materials, tin dioxide (SnO2), via a simple calcination process. The physical and gas sensing properties of these prepared Au/MASnI3/SnO2 composite toward NO2 gas at room temperature in dark and under 365 nm UV illumination were examined. The characterization demonstrates the formation of a p-n heterojunction structure between p-MASnI3 and n-SnO2. Due to to the good synergistic effect of the ternary materials, including the high light absorption of MASnI3, the surface plasmon resonance and the active catalytic effect of Au nanoparticles and the special interactions at MASnI3/SnO2 heterojunction, the Au/MASnI3/SnO2 sensor obtained by calcining Au/MASnI3 at 230°C (named as MSA230) exhibits superior gas sensing performance toward NO2 with high sensitivity (Rg/Ra= 240 up to 5 ppm NO2), ultra-fast recovery time (about 12s) and excellent selectivity as compared to the SnO2 and SnO2/Au counterparts at room temperature under UV illumination. All these characters make it more possible to be used as sensor material widely.