Yu Zhang, Quanqin Dai, Xinbi Li, Qingzhou Cui, Zhiyong Gu, Bo Zou, Yiding Wang* and William W Yu*
* Corresponding authors: Yiding Wang wangyiding47@yahoo.com.cn - William W Yu wyu6000@gmail.com
Nanoscale Research Letters 2010, 5:1279-1283 doi:10.1007/s11671-010-9637-7