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. Author manuscript; available in PMC: 2014 Aug 27.
Published in final edited form as: ACS Nano. 2014 Apr 11;8(5):4621–4629. doi: 10.1021/nn5003024

Figure 2.

Figure 2

a and b) SEM images of the Ad-SiNWS, which were prepared from wet-etching followed by covalent functionalization of Ad. The diameters and lengths of Ad-SiNWS are ca. 100–200 nm and 15–20 μm, respectively. c and d) Upon exposure of 100-nm pEGFP⊂SNPs in the solution/medium to Ad-SiNWS, the resulting pEGFP⊂SNPs-grafted Ad-SiNWS were examined by SEM. The narrow size distribution (106 ± 5 nm) of pEGFP⊂SNPs on Ad-SiNWS agrees with that observed by DLS measurements (inset d). e and f) Free Ad-SiNWS and pEGFP⊂SNPs-grafted Ad-SiNWS were released from the substrates, and their morphology and sizes were further examined by TEM.