1. Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, 01601 Kyiv, Ukraine
2. Lyon Institute of Nanotechnologies - CNRS - Ecole Centrale de Lyon - Universite de Lyon, 36 Avenue Guy de Collongue, 69134 Ecully, France
3. Université de Lorraine, CNRS, LEMTA, Nancy F-54000, France