1. Division of Materials Science
2. Faculty of Pure and Applied Sciences
3. University of Tsukuba
4. Tsukuba
5. Japan
6. Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE)
7. University of Duisburg-Essen
8. NanoEnergieTechnikZentrum (NETZ)
9. 47057 Duisburg
10. Germany
11. Division of Applied Physics
12. National Institute of Advanced Industrial Science and Technology (AIST)