1. Department
of Physics and Materials Science and Center of Super-Diamond and Advanced
Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR
2. School
of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), GPO Box 2434, Brisbane, QLD 4001, Australia
3. Shenzhen
Research Institute, City University of Hong Kong, High-Tech Zone, Nanshan District, Shenzhen, 518057, China