1. School of Material Science and Engineering Nanyang Technological University 50 Nanyang Ave Singapore 639798 Singapore
2. Institute of Materials Research and Engineering Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way Singapore 138634 Singapore
3. National Institute of Laser Enhanced Sciences (NILES) Cairo University Giza 12613 Egypt
4. Post Graduate and Research Department of Chemistry Sree Narayana College Kannur Kerala 670007 India
5. CINTRA CNRS/NTU/THALES UMI 3288 Research Techno Plaza Singapore 637553 Singapore
6. School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Ave Singapore 639798 Singapore