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Proceedings Paper

Nanostructured titania (TiO2) as hydrogen gas sensor
Author(s): G. S. Devi; Takeo Hyodo; Yasuhiro Shimizu; Makoto Egashira
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Paper 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.

Paper Details

Date Published: 14 October 2003
PDF: 5 pages
Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); doi: 10.1117/12.514838
Show Author Affiliations
G. S. Devi, Indian Institute of Chemical Technology (India)
Takeo Hyodo, Nagasaki Univ. (Japan)
Yasuhiro Shimizu, Nagasaki Univ. (Japan)
Makoto Egashira, Nagasaki Univ. (Japan)

Published in SPIE Proceedings Vol. 5062:
Smart Materials, Structures, and Systems
S. Mohan; B. Dattaguru; S. Gopalakrishnan, Editor(s)

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