Influence of Solar Electromagnetic Radiation on the Optical Properties of Micro-, Submicro- and Nanopowders of ZnO

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The diffuse reflection spectra of micro-, submicro- and nanopowders of ZnO after irradiation with solar electromagnetic radiation were researcherd. High purity ZnO powders purchased from Aladdin Chemistry were used. Average particle sizes of the studied powders were: from 800 to 3000 nm for micropowders, from 100 to 300 nm for submicropowders, 20–50 nm for nanopowders. Irradiation of the powders under study with electromagnetic radiation from the Solar was carried out for 2, 5, 10 and 15 h. The research results showed that the reflectivity of the surface of zinc oxide micropowders in the wavelength range from 200 to 2000 nm is higher than that of submicro- and nanopowders. The contribution to the formation of the integral absorption band responsible for the degradation of the optical properties of ZnO micro- and nanopowders is made by induced defects of the cationic sublattice, and of submicropowders — defects of the anionic sublattice and acceptor-donor pairs. Approximately the same intensity of absorption bands of defects in ZnO submicropowders explains the small change in the integral absorption coefficient of solar radiation for this type of powder. This explains the higher radiation resistance of zinc oxide submicropowders to the action of solar spectrum quanta under the same irradiation conditions.

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作者简介

I. Verkhoturova

Аmur State University

编辑信件的主要联系方式.
Email: rusia@mail.ru
俄罗斯联邦, Blagoveshchensk

V. Neshchimenko

Аmur State University

Email: v1ta1y@mail.ru
俄罗斯联邦, Blagoveshchensk

M. Mikhailov

Tomsk State University of Control Systems and Radioelectronics

Email: rusia@mail.ru
俄罗斯联邦, Tomsk

参考

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2. Fig. 1. SEM images of micro- (a), submicro- (b) and nanopowders (c) of zinc oxide.

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3. Fig. 2. Diffractograms from micro- (1), submicro- (2) and nanopowders (3) of ZnO. The labelled diffraction maxima correspond to the hexagonal structure of wurtzite.

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4. Fig. 3. Diffuse reflectance spectra of micro- (1), nano- (2) and submicro- (3) ZnO powders.

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5. Fig. 4. Dependence of the values of the change in the solar radiation absorption coefficient as micro- (1), nano- (2) and submicro-powders (3) of zinc oxide after irradiation with solar EMI on the exposure time.

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6. Fig. 5. Induced absorption spectra of micro- (a), nano- (b) and submicro-powders (c) of zinc oxide when exposed to EMI for 2 (1); 5 (2); 10 (3); 15 h (4).

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7. Fig. 6. Decomposition into individual bands of the induced absorption spectra of micro- (a), submicro- (b) and nanopowders (c) of zinc oxide after 15 h of EMI exposure.

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