Nanostructured titania (TiO2) as hydrogen gas sensor

G. S. Devi; Takeo Hyodo; Yasuhiro Shimizu; Makoto Egashira

doi:10.1117/12.514838

14 October 2003 Nanostructured titania (TiO₂) as hydrogen gas sensor

G. S. Devi, Takeo Hyodo, Yasuhiro Shimizu, Makoto Egashira

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514838
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

A simple procedure has been employed for synthesis of ultra fine nanosized mesoporous TiO₂ in the anatase and both phases (i.e. anatase and rutile) using polyethylene glycol (PEG) as gelling, dispersion and filming agent in aqueous media. Inorganic titanate rather than alkoxide or organic metal complexes were used as precursors. The reaction temperature of 100°C was employed to produce mesoporous TiO₂. These moderate reaction conditions are attributed to utilizing PEG as a gelling agent for formation of TiO₂. Thus the TiO₂ powder prepared in this way was ultra fine (approximately 4 nm) and crystallized Anatase phase with a BET surface area as high as 299m²/g. Pore size is measured to be approximately 3.5 nm, a value in good agreement to that indicated by crystallite size calculated from XRD spectra using Scherrer's equation. Although the mesoporous structure of the TiO₂ powder was not thermally stable enough, and both the pore volume and surface area decreased after calcination at elevated temperature but ordered mesoporous structure still remained even after calcinations at 600°C along with large surface area of 66.3 m²g^-1. The TiO₂ sensor prepared in the present study exhibited higher H₂ and CO sensitivities than the sensor fabricated with commercial TiO₂ powder. Thus it was confirmed that the ability of TiO₂ powder as a sensor material could be improved by controlling the mesoporous structure.

Citation Download Citation

G. S. Devi, Takeo Hyodo, Yasuhiro Shimizu, and Makoto Egashira "Nanostructured titania (TiO₂) as hydrogen gas sensor", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514838

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