Evaluation of oxygen adsorption based on the electric properties of SnO2 semiconductor gas sensors

Koichi Suematsu, Kiyomi Yamada, Masayoshi Yuasa, Tetsuya Kida, Kengo Shimanoe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We successfully prepared SnO2 nanoparticles of two different sizes by hydrothermal synthesis and calcination at 400°C 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.

Original languageEnglish
Pages (from-to)1211-1217
Number of pages7
JournalSensors and Materials
Volume28
Issue number11
DOIs
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Materials Science(all)

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