ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties

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dc.contributor.authorTomic, Milenacs
dc.contributor.authorClaros Vargas, Martha Carmiňacs
dc.contributor.authorGrácia, Isabelcs
dc.contributor.authorFigueras, Eduardcs
dc.contributor.authorCané, Carlescs
dc.contributor.authorVallejos Vargas, Stellacs
dc.coverage.issue13cs
dc.coverage.volume21cs
dc.date.accessioned2021-11-29T23:56:35Z
dc.date.available2021-11-29T23:56:35Z
dc.date.issued2021-06-30cs
dc.description.abstractZinc oxide rod structures are synthetized and subsequently modified with Au, Fe2O3, or Cu2O to form nanoscale interfaces at the rod surface. X-ray photoelectron spectroscopy corroborates the presence of Fe in the form of oxide-Fe2O3; Cu in the form of two oxides-CuO and Cu2O, with the major presence of Cu2O; and Au in three oxidation states-Au3+, Au+, and Au-0, with the content of metallic Au being the highest among the other states. These structures are tested towards nitrogen dioxide, ethanol, acetone, carbon monoxide, and toluene, finding a remarkable increase in the response and sensitivity of the Au-modified ZnO films, especially towards nitrogen dioxide and ethanol. The results for the Au-modified ZnO films report about 47 times higher response to 10 ppm of nitrogen dioxide as compared to the non-modified structures with a sensitivity of 39.96% ppm(-1) and a limit of detection of 26 ppb to this gas. These results are attributed to the cumulative effects of several factors, such as the presence of oxygen vacancies, the gas-sensing mechanism influenced by the nano-interfaces formed between ZnO and Au, and the catalytic nature of the Au nanoparticles.en
dc.formattextcs
dc.format.extent1-24cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationSENSORS. 2021, vol. 21, issue 13, p. 1-24.en
dc.identifier.doi10.3390/s21134509cs
dc.identifier.issn1424-8220cs
dc.identifier.other172780cs
dc.identifier.urihttp://hdl.handle.net/11012/202245
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofSENSORScs
dc.relation.urihttps://www.mdpi.com/1424-8220/21/13/4509cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1424-8220/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectzinc oxideen
dc.subjectgolden
dc.subjectiron oxideen
dc.subjectcopper oxideen
dc.subjectinterfacesen
dc.subjectSchottky junctionsen
dc.subjectheterojunctionsen
dc.subjectgas sensingen
dc.subjectnitrogen dioxideen
dc.titleZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Propertiesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-172780en
sync.item.dbtypeVAVen
sync.item.insts2021.11.30 00:56:35en
sync.item.modts2021.11.30 00:16:23en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Chytré nanonástrojecs
thesis.grantorVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. Ústav mikroelektronikycs
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