1. Nanotechnology Center; Institute of Textiles and Clothing; The Hong Kong Polytechnic University; Hong Kong China
2. The Hong Kong Polytechnic University, Shenzhen Research Institute; Shenzhen 518000 China
3. Centre for Advanced Structural Materials; Department of Mechanical and Biomedical Engineering; City University of Hong Kong; Tat Chee Avenue Kowloon Tong, Kowloon Hong Kong China