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Proceedings Paper

Ceramic materials and nanostructures for chemical sensing
Author(s): Abdul-Majeed Azad; Sheikh A. Akbar
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Paper Abstract

High selectivity, enhanced sensitivity, short response time and long shelf-life are some of the key features sought in the solid-state ceramic-based chemical sensors. Since the sensing mechanism and catalytic activity are predominantly surface-dominated, benign surface features in terms of higher aspect ratio, large surface area and, open and connected porosity, are required to realize a successful material. In order to incorporate these morphological features, a technique based on rigorous thermodynamic consideration of the metal/metal oxide coexistence, is described. By modulating the oxygen partial pressure across the equilibrium M/MO proximity line, formation and growth of new oxide surface on an atomic/ submolecular level under conditions of "oxygen deprivation", with exotic morphological features has been achieved in a number of metal oxides that are potential sensor materials. This paper describes the methodology and discusses the results obtained in the case of two model systems, viz., tungsten oxide (WO3) and titanium oxide (TiO2).

Paper Details

Date Published: 5 November 2005
PDF: 15 pages
Proc. SPIE 5998, Sensors for Harsh Environments II, 599801 (5 November 2005); doi: 10.1117/12.633679
Show Author Affiliations
Abdul-Majeed Azad, The Univ. of Toledo (United States)
Sheikh A. Akbar, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 5998:
Sensors for Harsh Environments II
Anbo Wang, Editor(s)

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