Yuan Yu, Liying Zhang*, Jian Wang, Zhi Yang, Mingce Long, Nantao Hu and Yafei Zhang*
* Corresponding authors: Liying Zhang liyingzhang@sjtu.edu.cn - Yafei Zhang yfzhang@sjtu.edu.cn
Nanoscale Research Letters 2012, 7:347 doi:10.1186/1556-276X-7-347
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