Yan Shen, Shaozhi Deng*, Yu Zhang, Fei Liu, Jun Chen and Ningsheng Xu*
* Corresponding authors: Shaozhi Deng stsdsz@mail.sysu.edu.cn - Ningsheng Xu stsxns@mail.sysu.edu.cn
Nanoscale Research Letters 2012, 7:463 doi:10.1186/1556-276X-7-463
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