Gas Sensing Characteristics of Sb-doped SnO2 Nanofibers

Undoped and Sb-doped SnO2 nanofibers were prepared by electrospinning and their responses to H2, CO, CH4, C3H8, and C2H5OH were measured. In the undoped SnO2 nanofibers, the gas response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to 100 ppm C2H5OH was very high(33.9), while that to the other gases ranged from 1.6 to 2.2. By doping with 2.65 wt % Sb, the response to 100 ppm C2H5OH was decreased to 4.5, whereas the response to H2 was increased to 3.0. This demonstrates the possibility of detecting a high H2 concentration with minimum interference from C2H5OH and the potential to control the gas selectivity by Sb doping