1. Advanced Materials and Devices Laboratory, Faculty of Sciences, School of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2. Department of Prosthodontics, Faculty of Health Sciences, School of Dentistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4. Faculty of Sciences, School of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
5. Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M1 3AL, UK