Ning Wei, Hui-Qiong Wang* and Jin-Cheng Zheng*
* Corresponding authors: Hui-Qiong Wang hqwang@xmu.edu.cn - Jin-Cheng Zheng jczheng@xmu.edu.cn
Nanoscale Research Letters 2012, 7:154 doi:10.1186/1556-276X-7-154
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