Fei Liu, Shuyan Song, Dongfeng Xue* and Hongjie Zhang*
* Corresponding authors: Dongfeng Xue dongfeng@ciac.jl.cn - Hongjie Zhang hongjie@ciac.jl.cn
Nanoscale Research Letters 2012, 7:149 doi:10.1186/1556-276X-7-149
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