Shuo Wang, Hua Wang, Wenquan Liang* and Yongzhuo Huang*
* Corresponding authors: Wenquan Liang wqliang@zju.edu.cn - Yongzhuo Huang yzhuang@mail.shcnc.ac.cn
Nanoscale Research Letters 2012, 7:219 doi:10.1186/1556-276X-7-219
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