1. Institute for Advanced and Core Technology; Showa Denko K.K.; 2 Oaza Nakanosu Oita 8 70-0189 Japan
2. Department of Materials Science; University of Milano Bicocca; Via R. Cozzi 55 20125 Milan Italy
3. Department of Synthetic Chemistry and Biological Chemistry; Graduate School of Engineering; Kyoto University; Katsura, Nishikyo-ku Kyoto 615-8510 Japan
4. Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Yoshida, Sakyo-ku Kyoto 606-8501 Japan