1. School of Materials Science and Engineering; Beihang University; Xueyuan Road 37 Beijing Haidian District 100191 P. R. China
2. Shandong Oubo New Material Co. Ltd; Dongying Port Economic Development Zone; Shandong 257088 P. R. China
3. Division of Integrated Molecular Engineering; Chemical Resources Laboratory; Tokyo Institute of Technology; 4259 Nagatsuta-cho Midoriku, Yokohama Kanagawa 226-8503 Japan