Jizu Lv*, Minli Bai, Wenzheng Cui* and Xiaojie Li
* Corresponding authors: Jizu Lv lvjizu2002@yahoo.com.cn - Wenzheng Cui cuiwenzheng@mail.dlut.edu.cn
Nanoscale Research Letters 2011, 6:200 doi:10.1186/1556-276X-6-200