Optoelectronic properties of layered titanate nanostructure and polyaniline impregnated devices

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buir.contributor.authorUyar, Tamer
buir.contributor.orcidUyar, Tamer|0000-0002-3989-4481
dc.citation.epage5891en_US
dc.citation.issueNumber18en_US
dc.citation.spage5885en_US
dc.citation.volumeNumber1en_US
dc.contributor.authorVempati S.en_US
dc.contributor.authorErtas Y.en_US
dc.contributor.authorBabu, V. J.en_US
dc.contributor.authorUyar, Tameren_US
dc.date.accessioned2018-04-12T10:57:59Z
dc.date.available2018-04-12T10:57:59Z
dc.date.issued2016en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractIntegrated structure of titanate nanotubes and nanosheets is investigated for their optical, electronic and optoelectronic properties when combined with HCl doped polyaniline (PANI). HR-TEM, SEM and XRD were employed for detailed morphological and microstructural understanding of the orthorhombic titanate nanostructure. Chemisorbed oxygeneous groups are probed with Raman spectroscopy which are found to desorb under UV-Vis treatment. We note a blue shift of Ti-O-Ti Raman frequency in contrast to Na-O-Ti stretching. Valence band region of titanate is analyzed for contribution of O2p, O2s, Na2p and Ti3p. Photoluminescence with different excitation energies revealed the presence of oxygen vacancy related defects in titanate. The highly occupied electronic states of PANI were also analyzed until 40 eV below the Fermi energy. XPS core-level analyses revealed ∼25 % doping density in PANI. Edges of valence band and HOMO are determined to be at 2.45 eV and 2.54 eV below Fermi energy for titanate and PANI, respectively. ITO/PANI/ITO has depicted negative photoresponse and the magnitude of which is reduced ∼4 times after combining with titanate nanostructure. Essentially the nanoscale architecture separates the emeraldine base and salt regions of PANI. This separation channelizes the charge carriers before trapping which reduces the magnitude of the negative photoresponse.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T10:57:59Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2016en_US
dc.identifier.doi10.1002/slct.201601229en_US
dc.identifier.issn2365-6549
dc.identifier.urihttp://hdl.handle.net/11693/36944
dc.language.isoEnglishen_US
dc.publisherWiley - V C H Verlag GmbH & Co. KGaAen_US
dc.relation.isversionofhttp://dx.doi.org/10.1002/slct.201601229en_US
dc.source.titleChemistrySelecten_US
dc.subjectCore-level XPSen_US
dc.subjectHeterojunctionen_US
dc.subjectHOMOen_US
dc.subjectPhotoresponseen_US
dc.subjectValence banden_US
dc.titleOptoelectronic properties of layered titanate nanostructure and polyaniline impregnated devicesen_US
dc.typeArticleen_US

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