Selective detection of formaldehyde gas using a Cd-Doped TiO2-SnO2 sensor

Wen Zeng, Tianmo Liu, Zhongchang Wang, Susumu Tsukimoto, Mitsuhiro Saito, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    121 Citations (Scopus)


    We report the microstructure and gas-sensing properties of a nonequilibrium TiO2-SnO2 solid solution prepared by the sol-gel method. In particular, we focus on the effect of Cd doping on the sensing behavior of the TiO2-SnO2 sensor. Of all volatile organic compound gases examined, the sensor with Cd doping exhibits exclusive selectivity as well as high sensitivity to formaldehyde, a main harmful indoor gas. The key gas-sensing quantities, maximum sensitivity, optimal working temperature, and response and recovery time, are found to meet the basic industrial needs. This makes the Cd-doped TiO2-SnO2 composite a promising sensor material for detecting the formaldehyde gas.

    Original languageEnglish
    Pages (from-to)9029-9038
    Number of pages10
    Issue number11
    Publication statusPublished - 2009 Nov


    • Cd doping
    • Formaldehyde
    • Gas sensor
    • TiO-SnO
    • Volatile organic compound

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Biochemistry
    • Atomic and Molecular Physics, and Optics
    • Instrumentation
    • Electrical and Electronic Engineering

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