SEM images of mesoporous silica films differing in GNR deposition density. (a) Low. (b) Medium. (c) High. Note that the densely packed GNR layer (right-hand image) is similar to the fractal-like GNR assembly on a silicon wafer (Additional file 1: Figure S2b). The white bars are 100 nm long.
Tsvetkov et al. Nanoscale Research Letters 2013 8:250 doi:10.1186/1556-276X-8-250