*
Corresponding authors
a
School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, Anhui 230009, China
b
Center Of Super-Diamond and Advanced Films (COSDAF), Centre for Functional Photonics, and Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
c
Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
d
Department of Chemistry, Chinese University of Hong Kong, Shatin, Hong Kong, China
e
Department of Mechanical and Biomedical Engineering, and Center for Advanced Structural Materials, City University of Hong Kong, Kowloon, Hong Kong, China
f
Centre for Advanced Structural Materials, City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen, China
g
City University of Hong Kong Shenzhen Research Institute, 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen, China
E-mail:
yangli@cityu.edu.hk
Tel: +86-852-3442-7810