1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China
2. Institute of Burn Research, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 40038, P. R. China
3. Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, Zhejiang, P. R. China