Tingting Chen, Liangming Wei*, Zhihua Zhou, Diwen Shi, Jian Wang, Jiang Zhao, Yuan Yu, Ying Wang and Yafei Zhang*
* Corresponding authors: Liangming Wei lmwei@sjtu.edu.cn - Yafei Zhang yfzhang@sjtu.edu.cn
Nanoscale Research Letters 2012, 7:644 doi:10.1186/1556-276X-7-644
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