Abstract
In 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.
Highlights
Dobijeni talog je odvojen dekantovanjem pa sušen na sobnoj temperaturi 24 h posle čega je sprašen u ahatnom avanu
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, shift band gap energy toward visible range of the spectrum
Summary
Sinteza praha ZnO vršena je na sledeći način: napravljen je 0,066 mol rastvor ZnCl2 tako što je 0,8975 g ZnCl2 (anhidrovanog, Lach-Ner, Neratovice) rastvoreno u 100 ml destilovane vode, uz konstantno mešanje na magnetnoj mešalici (200 rpm) na temperaturi od 50 C, u trajanju od 5 min. Ohlađena suspenzija je zatim centrifugirana 10 min pri 5000 rpm uz ispiranje vodom i etanolom da bi se uklonio nastali NaCl. Talog odvojen nakon centrifugiranja je sušen u sušnici tokom 24 h na temperaturi od 60 C. Pripremljena suspenzija je centrifugirana 10 min pri 5000 rpm. Dobijeni talog je odvojen dekantovanjem pa sušen na sobnoj temperaturi 24 h posle čega je sprašen u ahatnom avanu. Ramanovi spektri prahova snimljeni su na sobnoj temperaturi na DXR Raman mikroskopu (Thermo Scientific). Fotoluminiscentna (FL) spektralna merenja vršena su na Horiba Jobin Yvon Fluorolog FL3-22 spektrofluorometru sa ksenonskom (Xe) lampom kao izvorom ekscitacije i na sobnoj temperaturi
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