Jiefeng Yu, Dan Wang, Yining Huang, Xing Fan, Xin Tang, Cong Gao, Jianlong Li, Dechun Zou* and Kai Wu*
* Corresponding authors: Dechun Zou dczou@pku.edu.cn - Kai Wu kaiwu@pku.edu.cn
Nanoscale Research Letters 2011, 6:94 doi:10.1186/1556-276X-6-94
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