Zhongji Meng, Ruihua Song, Yue Chen, Yang Zhu, Yanhui Tian, Ding Li* and Daxiang Cui*
* Corresponding authors: Ding Li liding261@163.com - Daxiang Cui dxcui@sjtu.edu.cn
Nanoscale Research Letters 2013, 8:118 doi:10.1186/1556-276X-8-118