DOI QR코드

DOI QR Code

Gas Sensing Characteristics and Preparation of SnO2 Nano Powders

SnO2 나노 분말의 합성 및 가스 감응 특성

  • 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)
  • 이지영 (동의대학교 물리학과, 부산 IT융합부품연구소) ;
  • 유윤식 (동의대학교 방사선학과, 부산 IT융합부품연구소) ;
  • 유일 (동의대학교 물리학과, 부산 IT융합부품연구소)
  • Received : 2011.03.09
  • Accepted : 2011.06.10
  • Published : 2011.07.01

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

References

  1. W. S. Lee, K. W. Choi, N. H. Kim, and J. S. Park, J. KIEEME, 17, 1296 (2004).
  2. D. W. Sin, B. C. Kim, H. K. Jeon, C. T. Lee, D. D. Lee, and J. S. Heo, J. Kor. Sensors Soc., 222 (2002).
  3. K. M. Kim, K. W. Kim, P. S. Cho, and J. H. Lee, J. Kor. Sensors Soc., 14, 297 (2005).
  4. K. P. Seong, D. S. Choi, J. H. Kim, J. H. Moon, T. H. Myoung, and B. T. Lee, J. Kor. Mater. Res., 10, 778 (2005).