1. University of Rome “Tor Vergata” Department of Chemical Science and Technologies Via della Ricerca Scientifica 00133 Rome Italy
2. Department of Chemical Sciences University of Johannesburg Doornfontein Johannesburg South Africa (Formerly known as The Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg, South Africa
3. Centre for Nanomaterials Science Research University of Johannesburg South Africa