Influence of secondary oxide phases on microstructural and gas sensitive properties of nanostructured titanium dioxide thin films

M. R. Mohammadi, M. Ghorbani, D. J. Fray

    Research output: Contribution to journalConference article

    Abstract

    A systematic comparison of single and binary metal oxide T1O2, TiO2-Ga2O3, TiO2-Er 2O3 and TiO2-Ta2O5 gas sensors with nanocrystalline and mesoporous microstructure, prepared by sol-gel route, was conducted. The gas sensitivity was increased by secondary phase introduction into TiO2 film via two mechanisms, firstly through the inhibition of anatase-to-rutile transformation, since the anatase phase accommodates larger amounts of adsorbed oxygen, and secondly through the retardation of grain growth, since the higher surface area provides more active sites for gas molecule adsorption. The binary metal oxides exhibited a remarkable response towards low concentrations of CO and NO2 gases at low operating temperature of 200°C, resulting in increasing thermal stability of sensing films as well as decreasing their power consumption. The calibration curves revealed that all sensors followed the power law (S = A[gas]B) (where S is sensor response, coefficients A and B are constants and [gas] is gas concentration). The response magnitude of the sensors obtained in this work is superior to TiO2-based sensors reported in previous studies.

    Original languageEnglish
    Pages (from-to)41-44
    Number of pages4
    JournalAdvanced Materials Research
    Volume47-50
    Issue numberPart 1
    DOIs
    Publication statusPublished - 12 Jun 2008
    EventMulti-functional Materials and Structures - International Conference on Multifunctional Materials and Structures - Hong Kong, P.R., China
    Duration: 28 Jul 200831 Jul 2008

    Keywords

    • Gas sensor
    • Nanocrystalline
    • Sol-gel
    • Thin films
    • TiO-ErO

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