Rongfa Guan*, Jieqing Ma, Yihang Wu*, Fei Lu, Chaogeng Xiao, Han Jiang and Tianshu Kang
* Corresponding authors: Rongfa Guan Rongfaguan@163.com - Yihang Wu yihangwu@126.com
Nanoscale Research Letters 2012, 7:679 doi:10.1186/1556-276X-7-679
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