1. Institute
of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link,
Singapore 117602
2. Suzhou
Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industrial Park,
Jiangsu 215125, China
3. Department
of Electronic Science, University of Calcutta, 92-A. P. C. Road, Kolkata, India 700 009
4. Centre for Research in Nanoscience and Nanotechnology
(CRNN), University of Calcutta, JD-2 Sector
III, Kolkata, India 700 098
5. Department of Electronics and ECE, Indian Institute of Technology-Kharagpur, India 721302