Ppb-Level N-Propanol Gas Sensor Based on Ce-Doped Flower-Like In2O3 Compounded on rGO Nanosheets

N-propanol gas inhaled by human body can cause vomiting, headache, and other symptoms, causing serious harm to health. Therefore, it is indispensable to research a highly sensitive and efficient n-propanol gas sensor. However, conventional gas sensors cannot detect ppb-level n-propanol gas. In this article, combining the excellent properties of rare earth element Ce and reduced graphene oxide (rGO), 4%rGO-In2O3-4%Ce ternary composite was prepared by one-step hydrothermal method. The micromorphology and elemental composition of 4%rGO-In2O3-4%Ce were characterized by scanning electron microscopy(SEM) and energy dispersive spectrometer (EDS), respectively. The microstructure of rare earth element Ce-doped flower-like In(2)O(3)composited on rGO had been successfully prepared. Then the gas sensitivity of 4%rGO-In2O3-4%Ce nano composite material was tested. The experiment indicated that, compared with pure In2O3, 4%Ce-In2O3, and 4%rGO-In2O3, the 4%rGO-In2O3-4%Ce has the better gas sensitivity ton-propanol, and the optimal operating temperature of 4%rGO-In2O3-4%Ce was200 degrees C. Furthermore, the 4%rGO-In2O3-4%Ce gas sensor could detect 1 ppb n-propanol gas. Moreover, the gas-sensitive mechanism of 4%rGO-In2O3-4%Ce ton-propanol gas was explained.