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

Simple item page
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.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.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.orcid0000-0002-7415-5414cs
dc.identifier.other172780cs
dc.identifier.researcheridA-8550-2014cs
dc.identifier.scopus55934067000cs
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.subjectzinc oxide
dc.subjectgold
dc.subjectiron oxide
dc.subjectcopper oxide
dc.subjectinterfaces
dc.subjectSchottky junctions
dc.subjectheterojunctions
dc.subjectgas sensing
dc.subjectnitrogen dioxide
dc.titleZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Propertiesen
dc.title.alternativeZnO 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.insts2025.10.14 14:10:38en
sync.item.modts2025.10.14 09:32:41en
thesis.grantorVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. Ústav mikroelektronikycs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Chytré nanonástrojecs
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
sensors2104509v3.pdf
Size:
10.58 MB
Format:
Adobe Portable Document Format
Description:
sensors2104509v3.pdf
Download
Collections
Ústav mikroelektroniky
Chytré nanonástroje