1. School of Material Science and Engineering, Xi’an University of Technology, No. 5 Jinhua South Road, Xi’an, Shaanxi 710048, P. R. China
2. Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
3. School of Textile and Materials, Xi’an Polytechnic University, No. 19 Jinhua South Road, Xi’an, Shaanxi 710048, P. R. China
4. School of Biological and Chemical Engineering, Panzhihua University, No. 10 Airport Road, Panzhihua, Si’chuan 617000, P. R. China