1. School of Materials Science
and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
2. Key Laboratory of Chemical Biology
of Hebei Province, College of Chemistry and Environment Science, Hebei University, Baoding, 071002, P. R. China
3. School of Chemical and Biomedical
Engineering, Nanyang Technological University, 70 Nanyang Avenue, Singapore 637457
4. Institute of Elemental-Organic
Chemistry, Nankai University, Tianjin 300071,
P. R. China