Abstract
[ <TEX>$SnO_2$</TEX> ]nano powders were prepared by solution reduction method using tin chloride(<TEX>$SnCl_2{\cdot}2H_2O$</TEX>), hydrazine(<TEX>$N_2H_4$</TEX>) and NaOH. The <TEX>$SnO_2$</TEX> thick films for gas sensors were fabricated by screen printing method on alumina substrates and annealed at <TEX>$300^{\circ}C$</TEX> in air, respectively. XRD patterns of the <TEX>$SnO_2$</TEX> nano powders showed the tetragonal structure with (110) dominant orientation. The particle size of <TEX>$SnO_2$</TEX> nano powders at the ratio of <TEX>$SnCl_2:N_2H_4$</TEX>+NaOH= 1:6 was about 60 nm. The sensing characteristics were investigated by measuring the electrical resistance of each sensor in a test box. Sensitivity of <TEX>$SnO_2$</TEX> gas sensor to 5 ppm <TEX>$CH_4$</TEX>gas and 5 ppm <TEX>$CH_3CH_2CH_3$</TEX> gas was investigated for various <TEX>$SnCl_2:N_2H_4$</TEX>+NaOH proportion. The highest sensitivity to <TEX>$CH_4$</TEX> gas and <TEX>$CH_3CH_2CH_3$</TEX> gas of <TEX>$SnO_2$</TEX> sensors was observed at the <TEX>$SnCl_2:N_2H_4$</TEX>+NaOH= 1:8 and <TEX>$SnCl_2:N_2H_4$</TEX>+NaOH= 1:6, respectively. Response and recovery times of <TEX>$SnO_2$</TEX> gas sensors prepared by <TEX>$SnCl_2:N_2H_4$</TEX>+NaOH= 1:6 was about 40 s and 30 s, respectively.
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