Preparation of high surface area titania (TiO2) films and powders using particulate sol-gel route aided by polymeric fugitive agents

M. R. Mohammadi (Lead / Corresponding author), M. C. Cordero-Cabrera, D. J. Fray, M. Ghorbani

    Research output: Contribution to journalArticlepeer-review

    73 Citations (Scopus)

    Abstract

    High specific surface area (SSA) nanocrystalline powders and dip-coated TiO2 films have been prepared by particulate sol-gel route aided with polymeric fugitive agents (PFA), namely trehalose dihydrate (THD), polyethylene glycol (PEG6000) and hydroxypropyl cellulose (HPC). Powders obtained without PFA, heat-treated at 160 °C show a SSA of 181 m2/g, a value that could be increased up to 271 and 223 m2/g for samples heat-treated at 300 °C when PEG6000 and HPC were used, respectively, whereas SSA of 201 m2/g were achieved by using THD and subsequence heat-treating at 500 °C. Such surface area is one of the highest reported in the literature under these conditions. Crystallite sizes vary from 1 nm for as-produced powders up to 4 nm for powders heat-treated at 600 °C. It was found that crystallite size, microstructure, specific surface area and phase transformation are strongly dependent upon the PFA/TiO2 ratio and annealing temperature. Films produced under optimised conditions showed excellent microstructural properties for gas sensing applications.

    Original languageEnglish
    Pages (from-to)86-95
    Number of pages10
    JournalSensors and Actuators, B: Chemical
    Volume120
    Issue number1
    DOIs
    Publication statusPublished - 14 Dec 2006

    Keywords

    • Films
    • Gas sensors
    • Sol-gel processes
    • Specific surface area
    • TiO

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