1. Department of Applied Chemistry
2. University of Johannesburg
3. 2028 Johannesburg
4. South Africa
5. Centre for Nanomaterials Science Research
6. Laboratory of Photonics
7. Tampere University
8. FI-33104 Tampere
9. Finland
10. Advanced Ceramics and Nanotechnology Laboratory
11. Department of Materials Engineering
12. Faculty of Engineering
13. University of Concepcion
14. Concepcion
15. International and Interuniversity Centre for Nanoscience and Nanotechnology
16. Mahatma Gandhi University
17. Kottayam
18. India
19. School of Chemical Sciences
20. School of Pure and Applied Physics