Effect of Water Vapor on Pd-Loaded SnO2 Nanoparticles Gas Sensor

Nan Ma, Koichi Suematsu, Masayoshi Yuasa, Tetsuya Kida, Kengo Shimanoe

Research output: Contribution to journalArticlepeer-review

203 Citations (Scopus)


The effect of water vapor on Pd-loaded SnO2 sensor was investigated through the oxygen adsorption behavior and sensing properties toward hydrogen and CO under different humidity conditions. On the basis of the theoretical model reported previously, it was found that the mainly adsorbed oxygen species on the SnO2 surface in humid atmosphere was changed by loading Pd, more specifically, for neat SnO2 was O-, while for 0.7% Pd-SnO2 was O2-. The water vapor poisoning effect on electric resistance and sensor response was reduced by loading Pd. Moreover the sensor response in wet atmosphere was greatly enhanced by loading Pd. It seems that the electron depletion layer by p-n junction of PdO-SnO2 may impede OH- adsorption. (Graph Presented).

Original languageEnglish
Pages (from-to)5863-5869
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number10
Publication statusPublished - Mar 18 2015

All Science Journal Classification (ASJC) codes

  • General Materials Science


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