Transformation of polymer-ZnO core-shell nanofibers into ZnO hollow nanofibers: Intrinsic defect reorganization in ZnO and its influence on the photocatalysis

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buir.contributor.authorUyar, Tamer
buir.contributor.authorBıyıklı, Necmi
buir.contributor.orcidUyar, Tamer|0000-0002-3989-4481
dc.citation.epage653en_US
dc.citation.spage646en_US
dc.citation.volumeNumber176-177en_US
dc.contributor.authorKayaci, F.en_US
dc.contributor.authorVempati S.en_US
dc.contributor.authorOzgit Akgun, C.en_US
dc.contributor.authorDonmez, I.en_US
dc.contributor.authorBıyıklı, Necmien_US
dc.contributor.authorUyar, Tameren_US
dc.date.accessioned2016-02-08T09:37:43Z
dc.date.available2016-02-08T09:37:43Z
dc.date.issued2015en_US
dc.description.abstractPhotocatalytic activity (PCA) on semiconductors is known to be majorly influenced by specific surface area and intrinsic lattice defects of the catalyst. In this report, we tested the efficiencies of 1D ZnO catalysts of varying fiber diameter (80. nm and 650. nm of inner diameter) in two formats, viz. core-shell and hollow nanofibers, where the former is calcined to yield the latter. These nanofibrous catalysts were produced by combining electrospinning and atomic layer deposition processes which were then subjected to thorough characterization including photoluminescence (PL) unveiling the details of intrinsic defects/densities. During the thermal treatment, intrinsic defects are reorganized and as a result a new PL band is observed apart from some significant changes in the intensities of other emissions. The densities of various intrinsic defects from PL are compared for all samples and juxtaposed with the PCA. Careful scrutiny of the various results suggested an anti-correlation between surface area and PCA; i.e., higher surface area does not necessarily imply better PCA. Beyond a limit, the most deterministic factor would be the density of surface defects rather than the specific surface area. The results of this study enable the researchers to fabricate 1D semiconductor photocatalysts while striking the balance between surface area and density of defects.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T09:37:43Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2015en_US
dc.identifier.doi10.1016/j.apcatb.2015.04.036en_US
dc.identifier.issn0926-3373
dc.identifier.urihttp://hdl.handle.net/11693/20903
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.apcatb.2015.04.036en_US
dc.source.titleApplied Catalysis B: Environmentalen_US
dc.subjectDefect densityen_US
dc.subjectElectrospinningen_US
dc.subjectHollow nanofibersen_US
dc.subjectAtomic layer depositionen_US
dc.subjectCatalysisen_US
dc.subjectNanofibersen_US
dc.subjectPhotocatalysisen_US
dc.subjectShells (structures)en_US
dc.subjectSpecific surface areaen_US
dc.subjectSpinning (fibers)en_US
dc.subjectZinc oxideen_US
dc.subjectCore-shell nanofibersen_US
dc.subjectDensity of defectsen_US
dc.subjectFiber diametersen_US
dc.subjectIntrinsic defectsen_US
dc.subjectPhotocatalytic activitiesen_US
dc.subjectSemiconductor photocatalysten_US
dc.subjectZnOen_US
dc.subjectSurface defectsen_US
dc.titleTransformation of polymer-ZnO core-shell nanofibers into ZnO hollow nanofibers: Intrinsic defect reorganization in ZnO and its influence on the photocatalysisen_US
dc.typeArticleen_US

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Institute of Materials Science and Nanotechnology (UNAM)
Nanotechnology Research Center (NANOTAM)