Zhenqing Hou, Yixiao Wang, Lihua Shen, Hao Guo, Gongxin Wang, Yang Li, Shuifan Zhou, Qiqing Zhang* and Qian Jiang*
* Corresponding authors: Qiqing Zhang Zhangqiq@xmu.edu.cn - Qian Jiang jiangqian8185@126.com
Nanoscale Research Letters 2012, 7:507 doi:10.1186/1556-276X-7-507