Nanoscale physics

ODMR and luminescence studies of UV-induced transformations in CdS/PVA nanocomposites
Kovalchuk A.O.1,2, Rudko G. Yu.1,2, Vorona I.P.1, Fediv V. I.3, Shanina B.D.1, Chen W. M.4, Stehr J.4, Buyanova I. A.4
1V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine, 45, Pr. Nauky, Kiev, 03028, Ukraine
E-mail: email.of. g.yu.rudko@gmail.com
2National University “Kyiv-Mohyla Academy”, 2, Skovorody str., 04070 Kiev, Ukraine
3Department of Biophysics and Medical Informatics, Bukovinian State Medical University, 42 Kobylyanska st., 58000, Chernivtsi, Ukraine
4Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden

Recently nanocomposites had attracted a lot of a scientific and commercial interest. The properties of nanocomposites are determined by the properties of their constituents as well as by interactions nanoparticles-matrix. To reveal the contribution of these factors in the behavior of the nanocomosites as a whole it is necessary to discriminate the influence of different factors. In the present study we applied UV irradiation as a tool [1] to vary the properties of polymeric matrix and interface nanoparticle/polymer avoiding applications of any extraneous chemicals. To study UV-induced changes in the structure of nanocomposite we use photoluminescence and optically detected magnetic resonance techniques; the latter has been proven to be a powerful method foe the analyses of interfacial states in nanocomposites [2]. We demonstrated that intense UV radiation leads to the formation of new light-emitting centers in nanocomposite and to restructurization of interfacial states including destruction of oxygen-related defects.

1.	Rudko G.Yu., Kovalchuk A.O., Fediv V.I., Beyer J., Chen W.M., Buyanova I.A. Effects of Ultraviolet Light on Optical Properties of Colloidal CdS Nanoparticles Embedded in Polyvinyl Alcohol (PVA) Matrix //Advanced Science, Engineering and Medicine.-2012.- V. 4, No. 5.- P. 394.
2.	Rudko G.Yu., Vorona I.P., Fediv V. I., Kovalchuk A., Stehr J. E., Shanina B. D., Chen W.M., Buyanova I.A. Luminescent and Optically Detected Magnetic Resonance Studies of CdS/PVA Nanocomposite // Nanoscale Research Letters.- 2017.- 12.- 130.