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http://dx.doi.org/10.4313/JKEM.2011.24.7.589

Gas Sensing Characteristics and Preparation of SnO2 Nano Powders  

Lee, Ji-Young (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan)
Yu, Yoon-Sic (Radiological Science, Dong-Eui University, Convergence of IT Devices Institute Busan)
Yu, Il (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.7, 2011 , pp. 589-593 More about this Journal
Abstract
[ $SnO_2$ ]nano powders were prepared by solution reduction method using tin chloride($SnCl_2{\cdot}2H_2O$), hydrazine($N_2H_4$) and NaOH. The $SnO_2$ thick films for gas sensors were fabricated by screen printing method on alumina substrates and annealed at $300^{\circ}C$ in air, respectively. XRD patterns of the $SnO_2$ nano powders showed the tetragonal structure with (110) dominant orientation. The particle size of $SnO_2$ nano powders at the ratio of $SnCl_2:N_2H_4$+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 $SnO_2$ gas sensor to 5 ppm $CH_4$gas and 5 ppm $CH_3CH_2CH_3$ gas was investigated for various $SnCl_2:N_2H_4$+NaOH proportion. The highest sensitivity to $CH_4$ gas and $CH_3CH_2CH_3$ gas of $SnO_2$ sensors was observed at the $SnCl_2:N_2H_4$+NaOH= 1:8 and $SnCl_2:N_2H_4$+NaOH= 1:6, respectively. Response and recovery times of $SnO_2$ gas sensors prepared by $SnCl_2:N_2H_4$+NaOH= 1:6 was about 40 s and 30 s, respectively.
Keywords
$SnO_2$; $CH_4$; $CH_3CH_2CH_3$; Sensitivity;
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Times Cited By KSCI : 2  (Citation Analysis)
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