Ming Dong, Hao Wang*, Cong Ye*, Liangping Shen, Yi Wang, Jieqiong Zhang and Yun Ye
* Corresponding authors: Hao Wang nanoguy@126.com - Cong Ye yecong@issp.ac.cn
Nanoscale Research Letters 2012, 7:31 doi:10.1186/1556-276X-7-31