Please use this identifier to cite or link to this item: http://dspace.iiti.ac.in:8080/jspui/handle/123456789/424
Title: Effect of lattice distortion on bandgap decrement due to vanadium substitution in TiO2 nanoparticles
Authors: Shirage, Parasharam
Sen, Somaditya
Keywords: Physics
Issue Date: 2016
Publisher: Materials Science in Semiconductor Processing
Citation: Materials Science in Semiconductor Processing, vol. 50, pp. 7–13, Aug. 2016
Series/Report no.: JA03;
Abstract: Here wepresentasimpleandeffectivewayofbandgaptuningbyV-substitutioninTiO2. Thenano- particles ofTi(1-x)VxO2 (for 0rxr0.09) werepreparedbycontrolledandsimplified sol-gelmethod.The pure anatasephaseofTiO2 wasconfirmed byX-raydiffractionandRamanspectroscopy.Debye-scherrer formula andWilliamson-Hallplotgivecrystallitesizedecreasesfrom10.8to8.2nmwhenstrainin- creases from0.019to0.027for x¼0 to x¼0.09. Rietveldrefinement showthesystematicchangein crystal structurewiththeamountofV-substitutions.RamanshiftandbroadeningofFWHMof first Eg (145.52cm 1) modeobservedinRamanspectroscopyfollowinterestinglythesimilarandcorrelated observationwithXRDoutcomes.FESEMandUHRTEMrepresentpictorialviewofthemorphologyofthe nanoparticles withinformationaboutdifferentmicro-agglomerationsandcrystallinity.Theoxidation states andlocalenvironmentofelementsinnanoparticleswerestudiedusingXANES.V-substitutionin TiO2 showsbandgapmoderation:bandgapdecreasesgraduallywithsubstitutionfrom3.06–2.02 eVas concentration ofVincreasesfrom x¼0.0 to0.09.ThisextendstheapplicationofTiO2 in UVaswellas visible lightwhereastheapplicationofpureTiO2 is limitedinonlyUVregion.TheresultsofSEM,XRD, Raman spectroscopyandUV-visspectroscopyarecorrelatedwellwithlatticedistortionandthelattice distortion givestheUrbachenergy.Wereachtotheconclusionthattheeffectivebandgapdecreasesmay be duetocreationofimpurityenergylevelsorUrbachenergytailsjustabovevalancebandandbelow conduction band.
URI: http://hdl.handle.net/123456789/424
Appears in Collections:Discipline of Physics

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