1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education College of Chemistry and Materials Science Northwest University Xi'an 710127 China
2. Laboratory of Resource Biology and Biotechnology in Western China Ministry of Education Provincial Key Laboratory of Biotechnology of Shaanxi Province Northwest University Xi'an Shaanxi 710069 China
3. Department of Materials Science and Engineering National University of Singapore Singapore 117573 Singapore
4. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Centre for Excellence in Nanoscience National Centre for Nanoscience and Technology of China China