Koudo Nakaji, Hao Li, Takayuki Kiba, Makoto Igarashi, Seiji Samukawa and Akihiro Murayama*
* Corresponding author: Akihiro Murayama murayama@ist.hokudai.ac.jp
Nanoscale Research Letters 2012, 7:629 doi:10.1186/1556-276X-7-629