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

M. R. Mohammadi; M. C. Cordero-Cabrera; D. J. Fray; M. Ghorbani

doi:10.1016/j.snb.2006.01.046

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 journal › Article › peer-review

74 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 language	English
Pages (from-to)	86-95
Number of pages	10
Journal	Sensors and Actuators, B: Chemical
Volume	120
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2006.01.046
Publication status	Published - 14 Dec 2006

Keywords

Films
Gas sensors
Sol-gel processes
Specific surface area
TiO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1016/j.snb.2006.01.046

Cite this

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

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.",

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Preparation of high surface area titania (TiO₂) films and powders using particulate sol-gel route aided by polymeric fugitive agents. / Mohammadi, M. R. (Lead / Corresponding author); Cordero-Cabrera, M. C.; Fray, D. J. et al.

In: Sensors and Actuators, B: Chemical, Vol. 120, No. 1, 14.12.2006, p. 86-95.

Research output: Contribution to journal › Article › peer-review

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AU - Cordero-Cabrera, M. C.

AU - Fray, D. J.

AU - Ghorbani, M.

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AB - 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.

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