1. Institute of Textiles and Clothing, Hong Kong Polytechnic University, Hong Kong, People's Republic of China
2. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, People's Republic of China
3. ME&MS Department, Rice University, Houston, Texas 77005, United States
4. Department of Chemistry, Rice University, Houston, Texas 77005, United States