Pengwei Li, Rongming Wang*, Weimeng Chen, Chinping Chen*, Xingyu Gao and ATS Wee
* Corresponding authors: Rongming Wang rmwang@buaa.edu.cn - Chinping Chen cpchen@pku.edu.cn
Nanoscale Research Letters 2009, 5:597-602 doi:10.1007/s11671-009-9512-6