Structural and properties of nanocrystalline WO3/TiO2-based humidity sensors elements prepared by high energy activation

dc.contributor.authorRocha, K. O.
dc.contributor.authorZanetti, S. M. [UNESP]
dc.contributor.institutionSENCER Sensores Ceram Ltda
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:32:41Z
dc.date.available2014-05-20T15:32:41Z
dc.date.issued2011-10-20
dc.description.abstractNanocrystalline WO3/TiO2-based powders have been prepared by the high energy activation method with WO3 concentration ranging from 1 to 10 molt The samples were thermal treated in a microwave oven at 600 C for 20 min and their structural and micro-structural characteristics were evaluated by X-ray diffraction, Raman spectroscopy, EXAFS measurements at the Ti K-edge, and transmission electron microscopy. Nitrogen adsorption isotherms and H-2 Temperature Programmed Reduction were also carried out for physical characterization. The crystallite and particle mean sizes ranged from 30 to 40 nm and from 100 to 190 nm, respectively. Good sensor response was obtained for samples with at least 5 mol% WO3 activated for at least 80 min. Ceramics heat-treated in microwave oven for 20 min have shown similar sensor response as those prepared in conventional oven for 120 min, which is highly cost effective. These results indicate that WO3/TiO2 ceramics can be used as a humidity sensor element. (C) 2011 Elsevier B.V. All rights reserved.en
dc.description.affiliationSENCER Sensores Ceram Ltda, BR-13566445 São Carlos, SP, Brazil
dc.description.affiliationUNESP, INCTMN Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, INCTMN Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 02/09497-0
dc.format.extent654-661
dc.identifierhttp://dx.doi.org/10.1016/j.snb.2011.05.048
dc.identifier.citationSensors and Actuators B-chemical. Lausanne: Elsevier B.V. Sa, v. 157, n. 2, p. 654-661, 2011.
dc.identifier.doi10.1016/j.snb.2011.05.048
dc.identifier.issn0925-4005
dc.identifier.urihttp://hdl.handle.net/11449/41527
dc.identifier.wosWOS:000293161300046
dc.language.isoeng
dc.publisherElsevier B.V. Sa
dc.relation.ispartofSensors and Actuators B: Chemical
dc.relation.ispartofjcr5.667
dc.relation.ispartofsjr1,406
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectWO3/TiO2en
dc.subjectHigh energy activationen
dc.subjectHumidity sensoren
dc.subjectNanostructured oxideen
dc.titleStructural and properties of nanocrystalline WO3/TiO2-based humidity sensors elements prepared by high energy activationen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V. Sa
unesp.author.orcid0000-0001-7887-9113[1]

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