Jian Guo, Chenfei Song, Xiaoying Li, Bingjun Yu, Hanshan Dong, Linmao Qian* and Zhongrong Zhou
* Corresponding author: Linmao Qian linmao@swjtu.edu.cn
Nanoscale Research Letters 2012, 7:152 doi:10.1186/1556-276X-7-152