1. Industrial Research Institute of Nonwovens & Technical Textiles, College of Textiles & Clothing, Shandong Center for Engineered Nonwovens Qingdao University Qingdao 266071 China
2. College of Physics Qingdao University Qingdao 266071 China
3. School of Arts and Sciences Shanghai Dianji University Shanghai 201306 China
4. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China