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Sinteza i optičke karakteristike nanostrukturnih prahova ZnO i ZnO/PEO

dc.creatorRajić, Vladimir B.
dc.creatorVeselinović, Ljiljana
dc.creatorMarković, Smilja
dc.creatorUskoković, Dragan
dc.date.accessioned2018-06-09T10:10:18Z
dc.date.available2018-06-09T10:10:18Z
dc.date.issued2016
dc.identifier.issn0040-2176
dc.identifier.urihttps://scindeks.ceon.rs/article.aspx?artid=0040-21761601009R
dc.identifier.urihttp://www.ncbi.nlm.nih.gov/pubmed/0040-21761601009R
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/3359
dc.description.abstractIn this paper, microwave processing of nanostructured ZnO powder as well as preparation of nanostructured ZnO/PEO composite were described. As a fast processing method which introduces a large amount of energy in the reaction system, the role of microwave processing was to modify ZnO crystal structure, while the role of PEO was to additionally sensitivize surface of ZnO particles; both of the approaches were used in the aim to improve optical properties of zinc oxide in comparison with bulk one. The synthesized powders were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence (PL). It was found that point defects (oxygen vacancies and zinc interstitials) were created in the crystal structure of zinc oxide. However, PEO has two-fold role, it passivate surface of the ZnO particles, but also introduce oxygen interstitials on the surface. The influence of the point defects on optical properties of ZnO was studied; it was found that oxygen vacancies, zinc interstitials and oxygen interstitials improved percent of thevisible light absorption, also shift band gap energy toward visible range of the spectrum.
dc.description.abstractU ovom radu opisan je postupak mikrotalasnog procesiranja nanostrukturnog praha ZnO kao i metoda pripreme nano strukturnog kompozita ZnO/PEO (PEO - polietilen oksid). Uloga mikrotalasnog procesiranja, kao brze metode koja u sistem uvodi veliku količinu energije, bila je da modifikuje kristalnu strukturu ZnO dok je uloga PEO bila da dodatno senzitivizuje površinu čestica ZnO, a sve u cilju modifikovanja (poboljšanja) standardnih optičkih osobina cink oksidnog materijala. Sintetisani prahovi su analizirani metodama rendgenske difrakcije (XRD), Ramanove spektroskopije, skanirajuće elektronske mikroskopije (FESEM), UV-Vis difuzione refleksione spektroskopije (UV-Vis DRS) i fotoluminiscencije (FL). Uočeno je da su se u kristalnoj strukturi ZnO formirali tačkasti defekti, tačnije kiseonične vakancije i intersticije cinka, dok je prisustvo PEO sa jedne strane dovelo do pasivizacije površine čestica, dok je sa druge strane došlo do formiranja kiseoničnih intersticija. Ispitan je uticaj tačkastih defekata na optičke karakteristike prahova ZnO; kiseonične vakancije, kao i intersticije cinka i kiseonika utiču kako na procenat apsorpcije vidljive svetlosti (%) tako i na pomeraj energetskog procepa (eV) ka vidljivom delu spektra
dc.publisherBelgrade : Union of Engineers and Technicians of Serbia
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45004/RS//
dc.rightsopenAccess
dc.sourceTehnika
dc.titleSynthesis and optical properties of ZnO and ZnO/PEO nanonsructured powders
dc.titleSinteza i optičke karakteristike nanostrukturnih prahova ZnO i ZnO/PEO
dc.typearticleen
dc.rights.licenseBY
dcterms.abstractРајић, Владимир Б.; Ускоковић, Драган; Марковић, Смиља; Веселиновић, Љиљана; Синтеза и оптичке карактеристике наноструктурних прахова ЗнО и ЗнО/ПЕО;
dc.citation.spage9
dc.citation.epage15
dc.citation.volume71
dc.citation.issue1
dc.identifier.doi10.5937/tehnika1601009R
dc.type.versionpublishedVersion
dc.identifier.fulltexthttp://dais.sanu.ac.rs/bitstream/handle/123456789/3359/0040-21761601009R.pdf


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