Ruifan Tang, Kai Huang*, Hongkai Lai*, Cheng Li, Zhiming Wu and Junyong Kang
* Corresponding authors: Kai Huang k_huang@xmu.edu.cn - Hongkai Lai hkLai@xmu.edu.cn
Nanoscale Research Letters 2012, 7:346 doi:10.1186/1556-276X-7-346