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Dielectric properties and spectral characteristics of photocatalytic constant of TiO2 nanoparticles doped with cobalt

2021-10Journal article Open access
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dc.contributor.authorBessergenev, Valentin G.
dc.contributor.authorMariano, José F.
dc.contributor.authorMateus, Maria
dc.contributor.authorLourenço, João P.
dc.contributor.authorAhmed, Adwaa
dc.contributor.authorHantusch, Martin
dc.contributor.authorBurkel, Eberhard
dc.contributor.authorBotelho do Rego, Ana Maria
dc.date.accessioned2021-11-12T15:28:42Z
dc.date.available2021-11-12T15:28:42Z
dc.date.issued2021-10
dc.description.abstractDielectric properties and spectral dependence of the photocatalytic constant of Co doped P25 Degussa powder were studied. Doping of TiO2 matrix with cobalt was achieved by precipitation method using of Tris(diethylditiocarbamate)Co(III) precursor (CoDtc–Co[(C2H5)2NCS2]3). Five different Co contents with nominal Co/Ti atomic ratios of 0.005, 0.01, 0.02, 0.05 and 0.10 were chosen. Along with TiO2:Co samples, a few samples of nanopowders prepared by Sol-Gel method were also studied. As it follows from XPS and NMR studies, there is a concentration limit (TiO2:0.1Co) where cobalt atoms can be uniformly distributed across the TiO2 matrix before metallic clusters start to form. It was also shown that CoTiO3 phases are formed during annealing at high emperatures. From the temperature dependence of the dielectric constant it can be concluded that the relaxation processes still take place even at temperatures below 400 ◦C and that oxygen defect Ti–O octahedron reorientation take place at higher temperatures. The spectral dependency of the photocatalytic constant reveals the presence of some electronic states inside the energy gap of TiO2 for all nanopowdered samples.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3390/nano11102519pt_PT
dc.identifier.eissn2079-4991
dc.identifier.urihttp://hdl.handle.net/10400.1/17323
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationCentro de Química Estrutural
dc.relationInstitute of Nanoscience and Nanotechnology
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPhotocatalysispt_PT
dc.subjectNanomaterialspt_PT
dc.subjectDielectric propertiespt_PT
dc.subjectTitanium dioxidept_PT
dc.titleDielectric properties and spectral characteristics of photocatalytic constant of TiO2 nanoparticles doped with cobaltpt_PT
dc.title.alternativePropriedades dielétricas e características espectrais da constante fotocatalítica de nanopartículas TiO2 dopadas com cobaltopt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentro de Química Estrutural
oaire.awardTitleInstitute of Nanoscience and Nanotechnology
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FNAN%2F50024%2F2013/PT
oaire.citation.issue10pt_PT
oaire.citation.startPage2519pt_PT
oaire.citation.titleNanomaterialspt_PT
oaire.citation.volume11pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameBessergenev
person.familyNamePalma Mateus
person.familyNameLourenço
person.givenNameValentin
person.givenNameMaria
person.givenNameJoão P.
person.identifier634248
person.identifier.ciencia-id5F19-8237-1A27
person.identifier.ciencia-id791D-F900-E237
person.identifier.ciencia-idF81F-A1F0-2A7C
person.identifier.orcid0000-0001-5790-8501
person.identifier.orcid0000-0002-9278-5540
person.identifier.orcid0000-0002-0501-6672
person.identifier.ridA-7758-2008
person.identifier.scopus-author-id6701722001
person.identifier.scopus-author-id57195730600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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