1. College of Materials Science and Engineering Taiyuan University of Technology Taiyuan Shanxi 030024 P.R. China
2. College of Texiles & Clothing Qingdao University Qingdao Shandong 266071 P.R. China
3. Instrumental Analysis Center of Taiyuan University of Technology Taiyuan Shanxi 030024 PR China
4. Univ Wollongong, Australian Inst Innovat Mat, Inst Superconducting & Elect Mat, Innovat Campus North Wollongong NSW 2500 Australia