Sanghoon Ji, Ikwhang Chang, Yoon Ho Lee, Joonho Park, Jun Yeol Paek, Min Hwan Lee and Suk Won Cha*
* Corresponding author: Suk Won Cha swcha@snu.ac.kr
Nanoscale Research Letters 2013, 8:48 doi:10.1186/1556-276X-8-48