HONG Qin, FU Gang, PENG Zhen-kang, et al. Study on gas-sensing property of Au-doped SnO2 toluene sensor[J]. 2009, 28(2): 42-44+47. DOI: 10.13873/j.1000-97872009.02.009.
WO3 and La are prepared.Thick films to1uene sensors are fabricated in a planar structure by silk-screen printing.The effects of additives on the properties of SnO2 gas-sensors such as sensitivity
selectivity and response properties are researched according to electronic measuring and complex-impedance spectra.The results show that doping of Au can obviously improve the sensitivity of the sensor to toluene
when volume fraction of toluene is 100×10-6
the sensitivity is 35.The response time and the recover time of sensor is 20 s and 10 s respectively
the selectivity to alcohol
formaldehyde
acetone and benzene gases is good.The complex impedance analysis means that the sensitivity to toluene comes from the change of SnO2 grain-boundary resistance and grain-boundary capacitance.That is relational to the adsorption and desorption of surface oxygen-ion improved by the doping of Au.