1. Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou 515063, P. R. China
2. Department of Mechanical Engineering, Shantou University, Guangdong 515063, P. R. China
3. Chemistry and Chemical Engineering, Guangdong Laboratory, Shantou 515063, P. R. China