Photoluminescence and Catalytic Performance of Gamma Activated ZnO Nanoparticles
Abstract
A methanol conversion on γ-activated nanoparticles of ZnO is investigated at room temperature through the example of a model reaction. Activation of nanoparticles of ZnO is carried out by slowing-down γ - radiation on the high-current electronic accelerator in NSC KIPT at energy of electrons 22 MeV and a current 500 mА. An element composition, crystallinity and character of an intermolecular interaction in samples of activated and initial nanoparticles of ZnO are studied by the methods of γ-spectroscopy, X‑ray diffraction and IR-spectroscopy. The transformations were analysed and it was shown that there were no essential changes in the structure of ZnO: activated nanoparticles of ZnO maintained the monophase state and crystallinity of the initial state. The energy band diagram of nanoparticles of ZnO explains the photoluminescence results. Measurements of photoluminescence allow to suppose that the observed increase in intensity of luminescence in a case of γ-activated nanoparticles of ZnO is attained by a mutual amplification of the highly active oxygen superficial centers action and Auger electrons from 65Zn. A considerable increase in catalytic activity of ZnO after its γ-activation is ascribed to the synergy of factors of ionizing radiation - noticeable ionization losses of Auger electrons near the surface of ZnO nanoparticles from 65Zn - and influence of high-reactionary formations of a heterogeneous catalysis.
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