Highly response CO2 gas sensor based on Au-La2O3 doped SnO2 nanofibers

Abstract In this study, 5 wt% La2O3 doped SnO2 nanofibers (La2O3/SnO2 NFs) were prepared using an electrospinning process after annealing at 600 °C for 1 h. The gas sensor fabricated using the 5 wt% La2O3/SnO2 NFs was found to effectively improve the responses of many types of gases, especially CO2. Then, the Au particles with a particle size range of approximately 15–20 nm were sputtered on 5 wt% La2O3/SnO2 NFs. The Au particles were also shown to effectively enhance the gas sensing properties, which can improve the response of a gas sensor by 50%.