1. Nanoscience Research Group and Aston Institute of Photonic Technologies, School of Engineering & Applied Science, Aston University, Aston Triangle, B4 7ET Birmingham, U.K.
2. Institute
of Physics, National Academy of Sciences of Ukraine, 46, prospekt
Nauky, 03680 Kyiv, Ukraine
3. Al Musanna College of Technology, Muladdah, Al Musanna, P.O. Box 191, P.C. 314, Sultanate of Oman
4. Physics
Department, Faculty of Science, University of Sulaimani, P.O. Box 334, Sulaimani, Iraq-Kurdistan Region
5. Institute
of Organic Chemistry, National Academy of Sciences of Ukraine, 5, Murmanska str., 02660 Kyiv, Ukraine
6. Faculty of
Physics, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska
str., 01601 Kyiv, Ukraine