pp. 1211-1217
S&M1282 Research Paper of Special Issue https://doi.org/10.18494/SAM.2016.1415 Published: November 16, 2016 Evaluation of Oxygen Adsorption Based on the Electric Properties of SnO2 Semiconductor Gas Sensors [PDF] Koichi Suematsu, Kiyomi Yamada, Masayoshi Yuasa, Tetsuya Kida, and Kengo Shimanoe (Received June 6, 2016; Accepted August 3, 2016) Keywords: SnO2, nanoparticles, oxygen adsorption, equilibrium constant
We successfully prepared SnO2 nanoparticles of two different sizes by hydrothermal synthesisand calcination at 400 ℃ to evaluate the oxygen adsorption equilibrium constant K(O2−ad) on a particle surface. The K(O2−ad) values were calculated from the relationship between the electric resistance and the oxygen partial pressure (PO2). The K(O2−ad) values of 7 and 17 nm SnO2 nanoparticles were almost in the same range when the donor densities of these nanoparticles are the same. Additionally, the sensor responses of these nanoparticles to hydrogen were affected by the surface-area-to-volume ratio because the K(O2− ad) values are the same. Thus, we propose that the K(O2−ad) value can be evaluated on the basis of the relationship between the electric resistance and PO2.
Corresponding author: Kengo ShimanoeCite this article Koichi Suematsu, Kiyomi Yamada, Masayoshi Yuasa, Tetsuya Kida, and Kengo Shimanoe, Evaluation of Oxygen Adsorption Based on the Electric Properties of SnO2 Semiconductor Gas Sensors, Sens. Mater., Vol. 28, No. 11, 2016, p. 1211-1217. |