Electronic supplementary material.The online version of this article (doi:10.1007/s11671-009-9265-2) contains supplementary material, which is available to authorized users. Format: PDF Size: 768KB Download file This file can be viewed with: Adobe Acrobat Reader Hu et al. Nanoscale Research Letters 2009 4:437 doi:10.1007/s11671-009-9265-2 |