1. School of Textile and Clothing, Nantong University, Nantong 226019, P. R. China
2. College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China
3. Key Laboratory of Jiangsu Province for Silk Engineering, Soochow University, Suzhou 215123, P. R. China
4. Institute of Applied Physics and Materials Engineering, University of Macau, Macau 999078, P. R. China