Sangmin Lee, Jang-Yeon Kwon, Daesung Yoon, Handong Cho, Jinho You, Yong T Kang, Dukhyun Choi* and Woonbong Hwang*
* Corresponding authors: Dukhyun Choi dchoi@khu.ac.kr - Woonbong Hwang whwang@postech.ac.kr
Nanoscale Research Letters 2012, 7:256 doi:10.1186/1556-276X-7-256