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Nanocrystalline SnO_2:Sc-2O_3 was synthesized by a two-step hydrothermal process in the presence of urea.The transient response of the SnO_2:Sc_2O_3 gas sensor to 200μg/g～100Oμg/g CO was studied by AC impedance spectroscopy. Complex impedance measurement was carried out from 0.5 to 10~7 Hz,and the data were fitted with an equivalent circuit of two parallel circuits of a resistance and a constant phase element (CPE) in series.The sensitivity of the as-sintered samples demonstrated well linear relationship with the CO concentration.The doping of Sc_2O_3 could improve the CO sensitivity significantly,and the nanocrystalline SnO_2:Sc_2O_3 at the composition of 8～10 mol% Sc_2O_3 promises good candidate materials in gas sensors.
Nanocrystalline SnO_2: Sc-2O_3 was synthesized by a two-step hydrothermal process in the presence of urea. The transient response of the SnO_2: Sc_2O_3 gas sensor to 200μg / g ~ 100Oμg / g CO was studied by AC impedance spectroscopy. was carried out from 0.5 to 10 ~ 7 Hz, and the data were fitted with an equivalent circuit of two parallel circuits of a resistance and a constant phase element (CPE) in series. The sensitivity of the as-sintered samples demonstrated well linear relationship with the CO concentration.The doping of Sc_2O_3 could improve the CO sensitivity significantly, and the nanocrystalline SnO_2: Sc_2O_3 at the composition of 8~10 mol% Sc_2O_3 promises good candidate materials in gas sensors.