CRCU

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (6): 1086-1090.

• Articles • Previous Articles     Next Articles

Effect of Nanoparticle Size on Gas-sensing Properties of Tin Dioxide Sensors

XU Hong-yan1,2, CUI De-liang3, CAO Bing-qiang1,2   

  1. 1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, P. R. China;
    2. Key Laboratory of Preparation and Measurement of Building Materials of Shandong Province, University of Jinan, Jinan 250022, P. R. China;
    3. State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, P. R. China
  • Received:2011-11-03 Revised:2012-05-14 Online:2012-11-25 Published:2012-11-09
  • Contact: XU Hong-yan E-mail:mse_xuhy@ujn.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.60906008) and the Foundation for Excellent Middle-aged or Young Scientists from Shandong Province of China(No.BS2010CL007).

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Abstract:

Sn(OH)4 was prepared by the conventional solution precipitate method, followed by supercritical CO2 drying. The resultant Sn(OH)4 was divided into three aliquots and calcined at 400, 600 and 800℃, respectively, thus SnO2 nanoparticles with average crystallite sizes of 5, 10 and 25 nm were obtained. Furthermore, three SnO2 thick film gas sensors(denoted as sensors S-400, S-600 and S-800) were fabricated from the above SnO2 nanoparticles. The adhesion of sensing materials on the surface of alumina tube is good. Compared to the sensors S-600 and S-800, sensor S-400 showed a much higher sensitivity to 1000 μL/L ethanol. On the other hand, sensor S-800 showed a much lower intrinsic resistance and improved selectivity to ethanol than sensors S-400 and S-600. X-Ray diffraction(XRD), transmission electron microscopy(TEM) and selective area electron diffraction(SAED) measurements were used to characterize the SnO2 nanoparticles calcined at different temperatures. The differences in the gas sensing performance of these sensors were analyzed on the basis of scanning electron microscopy(SEM).

Key words: SnO2 nanoparticle, Gas sensor, Sensitivity, Ethanol, Selectivity