Highly sensitive and selective gas sensor based on SnO2/Fe2O3@rGO nanocomposite for detection of formaldehyde

A highly sensitive and selective HCHO gas sensor based on SnO2/Fe2O3 nanocomposites decorated with reduced graphene oxide (rGO) nanosheets was prepared through the microwave -assisted hydrothermal method. The obtained products were characterized by X-ray diffraction and scanning electron microscopy. The gas sensing results show that the SnO2/Fe2O3@rGO sensor, with high response of 11.21 to HCHO gas, short response time of 32 s, short recovery time of 33 s, and good repeatability, is superior to single -component sensor SnO2@rGO. It can be inferred that the heterojunction effect among SnO2, Fe2O3 and rGO could facilitate the electron transfer, thus enhance the gas response to HCHO. The results may open an avenue for SnO2/Fe2O3@rGO as a promising sensor to detect toxic gas.