H2 sensing mechanism of Pd-loaded WO3 nanoparticle gas sensors

Zhongqiu Hua, Masayoshi Yuasa, Tetsuya Kida, Noboru Yamazoe, Kengo Shimanoe

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Neat and Pd-loaded WO3 sensors were fabricated from lamellar-structured nanoparticles. The sensing mechanism of hydrogen was investigated. Oxygen adsorption properties were studied through the resistive responses and TPD measurements. It was observed that oxygen adsorption was significantly enhanced by Pd loading from the viewpoint of p-n junction for PdO-WO3. In the presence of H2, the resistive response to oxygen for Pd-loaded WO3 was obviously different from that of neat WO3, which demonstrated a relatively weak response to oxygen. It was concluded that Pd loading not only promoted the sensor response but also made the sensing mechanism different from that of neat WO3. It was proposed that with Pd loading, the surface lattice oxygen near Pd sites was involved for the sensing process of H2.

Original languageEnglish
Pages (from-to)1435-1437
Number of pages3
JournalChemistry Letters
Volume43
Issue number9
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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