1. College of Materials and Energy; South China Agricultural University; Guangzhou 510642 P. R. China
2. Key Laboratory of Energy Plants Resource and Utilization; Ministry of Agriculture; Institute of New Energy and New Materials; South China Agricultural University; Guangzhou 510642 P. R. China
3. State Key Laboratory of Advanced Technology for Material Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 P. R. China
4. Department of Physics; Faculty of Science; King Abdulaziz University; Jeddah 21589 Saudi Arabia