Gas-sensing properties and in situ diffuse-reflectance Fourier-transform infrared spectroscopy study of diethyl ether adsorption and reactions on SnO_2/rGO film

摘要

Diethyl ether is widely used in the fields of diesel engines, agriculture, food, chemical, biological, pharmaceutical, and medical industries. It is necessary to carry out real-time monitoring of this molecule due to its harmful effects on human health. In this study, a highly sensitive SnO_2/rGO gas-sensing material has been prepared by a hydrothermal method. The surface adsorption and reaction processes between the SnO_2/rGO gas-sensing film and diethyl ether have been studied by the in situ diffuse-reflectance Fourier-transform infrared spectroscopy at different temperatures. The results show that the SnO_2/rGO gas-sensing material has high sensitivity to diethyl ether, and the lowest detection limit can reach 1 ppm, and that ethyl (CH_3 CH_2~·), oxethyl (CH_3CH_2O~·), ethanol (CH_3CH_2OH), formaldehyde (HCHO), acetaldehyde (CH_3CHO), ethylene (C_2H_4), H_2O, and CO_2 surface species are formed during diethyl ether adsorption at different temperatures. A possible mechanism of the reaction process is discussed.