Characterisation of the catalyst-semiconductor interaction mechanism in metal-oxide gas sensors

Vlachos, DS; Papadopoulos, CA; Avaritsiotis, JN

dc.contributor.author	Vlachos, DS	en
dc.contributor.author	Papadopoulos, CA	en
dc.contributor.author	Avaritsiotis, JN	en
dc.date.accessioned	2014-03-01T01:12:39Z
dc.date.available	2014-03-01T01:12:39Z
dc.date.issued	1997	en
dc.identifier.issn	0925-4005	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12194
dc.subject	Fermi energy control	en
dc.subject	Metal-oxide gas sensors	en
dc.subject	Spillover	en
dc.subject.classification	Chemistry, Analytical	en
dc.subject.classification	Electrochemistry	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.other	Catalysts	en
dc.subject.other	Computer simulation	en
dc.subject.other	Crystal microstructure	en
dc.subject.other	Fermi level	en
dc.subject.other	Interfaces (materials)	en
dc.subject.other	Interfacial energy	en
dc.subject.other	Monte Carlo methods	en
dc.subject.other	MOS devices	en
dc.subject.other	Palladium	en
dc.subject.other	Platinum	en
dc.subject.other	Polycrystalline materials	en
dc.subject.other	Catalyst semiconductor interaction	en
dc.subject.other	Metal oxide gas sensors	en
dc.subject.other	Spillover process	en
dc.subject.other	Chemical sensors	en
dc.title	Characterisation of the catalyst-semiconductor interaction mechanism in metal-oxide gas sensors	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0925-4005(97)00150-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0925-4005(97)00150-0	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	Catalysts may affect the iutergranular contact regions in polycrystalline metal-oxide films with two mechanisms: spillover and Fermi energy control. In this work, a simple experimental method is proposed consisting of monitoring sensor resistance as a function of oxygen partial pressure, in order to distinguish which of these mechanisms is dominant in certain catalyst-metal oxide interfaces. Interpretation of experimental results, using the theoretical background for these two mechanisms in the case of InOx sensors with palladium and platinum catalysts, indicates that the electronic interaction of Fermi energy control dominates in the case of palladium, while the chemical interaction of spillover dominates in the case of platinum. These results are also confirmed by Monte Carlo simulation of the spillover process. (C) 1997 Elsevier Science S.A.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Sensors and Actuators, B: Chemical	en
dc.identifier.doi	10.1016/S0925-4005(97)00150-0	en
dc.identifier.isi	ISI:000071717900037	en
dc.identifier.volume	44	en
dc.identifier.issue	1-3	en
dc.identifier.spage	458	en
dc.identifier.epage	461	en