1. Department of Materials Science and Technology University of Crete Heraklion 70013 Greece
2. Institute of Electronic Structure and Laser – Foundation for Research and Technology Hellas Heraklion 70013 Greece
3. Department of Chemical Engineering Aristotle University of Thessaloniki Thessaloniki 54124 Greece
4. Chemical Process and Energy Resources Institute Centre for Research & Technology Hellas Thessaloniki 57001 Greece
5. Department of Mechanical Engineering University of Western Macedonia Kozani 50100 Greece
6. Department of Physics University of Crete Heraklion 70013 Greece