(530h) Impedancemetric High Temperature Gas Sensor Based On Electrospun Metal Oxide Nanofibers for Selective Reducing Gas Detection
AIChE Annual Meeting
2013
2013 AIChE Annual Meeting
Topical Conference: Sensors
Catalytic, Environmental and Industrial Sensors
Wednesday, November 6, 2013 - 5:07pm to 5:23pm
A high temperature gas sensor was developed based on electrospun metal oxide nanofibers. The morphology of the nanofibers was investigated by scanning electron microscopy and transmission electron microscopy. The impedance spectroscopy of the as-prepared nanofibers based sensor was investigated in N2 and different gas mixtures (O2, CO, C3H8, CO2, NO and SO2 balanced by N2 in varied concentrations) at 800 oC. The sensing mechanism was investigated by equivalent circuit analysis. For the first time, the sensor was operated at high frequency, in which case strong reducing gas (CO and C3H8) can be selectively detected with good sensitivity, and the responses from other gases can be fully eliminated. These good results suggest that the as-prepared nanofibers is a promising material for the application of high temperature sensors for reducing gas detection and impedancemetric technique is a promising approach to improve the selectivity of gas sensors by choosing an appropriate applied frequency.