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

133 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
Externally publishedYes


  • 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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