Weiling Zhu, Changzhou Wang, Mingcheng Sun, Simian Li, Jiwei Zhai* and Tianshu Lai*
* Corresponding authors: Jiwei Zhai apzhai@tongji.edu.cn - Tianshu Lai stslts@mail.sysu.edu.cn
Nanoscale Research Letters 2012, 7:638 doi:10.1186/1556-276X-7-638
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