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Citation: SHI Juan, WU Shi-Hua, WANG Shu-Rong, LI Peng. Nanocrystalline SnO₂ Gas Sensors Obtained from Pyrolysis and Their Sensitivities[J]. Chinese Journal of Applied Chemistry, ;2006, 23(12): 1396-1400. shu

Nanocrystalline SnO₂ Gas Sensors Obtained from Pyrolysis and Their Sensitivities

SHI Juan ^a,, ,
WU Shi-Hua ^b ,
WANG Shu-Rong ^b ,
LI Peng ^b

1.
a Institute of Materials Science and Chemical Engineering, Tianjin Polytechinic University, Tianjin 300160;
2.
b Department of Chemistry, Nankai University, Tianjin

Corresponding author: SHI Juan,
Received Date: 22 December 2005
Available Online: 12 April 2006

Nanosized gas sensing material SnO₂ was synthesized through pyrolysis of an oxalate precursor at different temperatures.The SnO₂ samples were characterized by means of XRD,IR and gas sensing testing.The results reveal that at different pyrolysis temperatures,the SnO₂ particles obtained show different grain sizes.The results indicate that the mechanism for SnO₂ crystal growth was different when the pyrolysis temperature was below or above 650℃.The grain size of SnO₂ increased slowly with pyrolysis temperature up to 650℃,where surface diffusion was dominant,while at above 650℃,grains began to grow via crystal boundary migration,and grew rapidly.Sensitivity of nanosized gas sensing material SnO₂ is greatly affected by pyrolyzing temperature,while response and recovery time is relatively stable.SnO₂ obtained at 650℃ exhibits the best sensitive properties.
- tin oxide,
- grain growth,
- gas sensor
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Nanocrystalline SnO₂ Gas Sensors Obtained from Pyrolysis and Their Sensitivities