Ceramic materials and nanostructures for chemical sensing

Abdul-Majeed Azad; Sheikh A. Akbar

doi:10.1117/12.633679

5 November 2005 Ceramic materials and nanostructures for chemical sensing

Abdul-Majeed Azad, Sheikh A. Akbar

Proceedings Volume 5998, Sensors for Harsh Environments II; 599801 (2005) https://doi.org/10.1117/12.633679
Event: Optics East 2005, 2005, Boston, MA, United States

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).

Citation Download Citation

Abdul-Majeed Azad and Sheikh A. Akbar "Ceramic materials and nanostructures for chemical sensing", Proc. SPIE 5998, Sensors for Harsh Environments II, 599801 (5 November 2005); https://doi.org/10.1117/12.633679

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