1. Department of Chemistry City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China
2. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China
3. Department of Electrical Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China
4. Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM) City University of Hong Kong Hong Kong China
5. Shenzhen Research Institute City University of Hong Kong Shenzhen 518057 China