1. School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore
2. CINTRA CNRS/NTU/THALES UMI 3288 Research Techno Plaza 50 Nanyang Drive Singapore 637553 Singapore
3. School of Material Science Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
4. Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China
5. Division of Advanced Nanomaterials Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences Suzhou 215123 China
6. Institut d'Electronique de Microélectronique et de Nanotechnologie (IEMN) CNRS UMR 8520-Université de Lille Villeneuve d'Ascq 59650 France