1. a Technological Education Institute (TEI) of Kozani Laboratories of Physics and Material Technology , 50100, Kila, Kozani, Greece
2. b National Technical University of Athens, Department of Physics Zografou Campus , GR, 15713, Athens, Greece
3. c Department of Pure and Applied Chemistry , University of Strathclyde , Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1XL, UK