Shaofeng Zhang, Wei Wu, Xiangheng Xiao, Juan Zhou, Feng Ren* and Changzhong Jiang*
* Corresponding authors: Feng Ren fren@whu.edu.cn - Changzhong Jiang czjiang@whu.edu.cn
Nanoscale Research Letters 2011, 6:89 doi:10.1186/1556-276X-6-89
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