A model for the gas sensing properties of tin oxide thin films with surface catalysts

Papadopoulos, CA; Avaritsiotis, JN

dc.contributor.author	Papadopoulos, CA	en
dc.contributor.author	Avaritsiotis, JN	en
dc.date.accessioned	2014-03-01T01:10:39Z
dc.date.available	2014-03-01T01:10:39Z
dc.date.issued	1995	en
dc.identifier.issn	0925-4005	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11421
dc.subject	Conductance of metal films	en
dc.subject	Surface additives	en
dc.subject	Tin oxide thin films	en
dc.subject.classification	Chemistry, Analytical	en
dc.subject.classification	Electrochemistry	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.other	Additives	en
dc.subject.other	Carbon monoxide	en
dc.subject.other	Deposition	en
dc.subject.other	Electric conductivity	en
dc.subject.other	Magnetron sputtering	en
dc.subject.other	Mathematical models	en
dc.subject.other	Metallic films	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Thin films	en
dc.subject.other	Tin compounds	en
dc.subject.other	Noble metal	en
dc.subject.other	Surface additives	en
dc.subject.other	Tin oxide thin films	en
dc.subject.other	Ultrathin discontinuous metal films	en
dc.subject.other	Zero grade air	en
dc.subject.other	Chemical sensors	en
dc.title	A model for the gas sensing properties of tin oxide thin films with surface catalysts	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0925-4005(95)01728-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0925-4005(95)01728-3	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	The effect of two types of surface additives (Pd and Pt) on the response of reactively sputtered thin films of SnOx gas sensors has been studied, in mixtures of zero grade air and carbon monoxide. The experimental results obtained with surface additives show an abrupt conductance increase around 500 K when carbon monoxide in the ppm range is present, a behaviour which has not been observed with plain SnOx films. A semi-empirical model that explains this behaviour is presented, that is based on the well-established theory for the conductivity of ultrathin discontinuous metal films, i.e. activated charge carrier creation and tunnelling through potential barriers. The proposed model takes into account the dependence of film conductivity both on the thickness of the noble metal deposited on it and on the working temperature. The results of the theoretical analysis are in excellent qualitative agreement with the experimental ones. © 1995.	en
heal.publisher	ELSEVIER SCIENCE SA LAUSANNE	en
heal.journalName	Sensors and Actuators: B. Chemical	en
dc.identifier.doi	10.1016/0925-4005(95)01728-3	en
dc.identifier.isi	ISI:A1995TD06500005	en
dc.identifier.volume	28	en
dc.identifier.issue	3	en
dc.identifier.spage	201	en
dc.identifier.epage	210	en