Additional file 1: Figure S1.

SEM images of 250 nm Au nanoparticles dispersed on the Si substrates. (a, b) 1 (Au nanoparticles) : 3 (DI water) solution. (c, d) 1 (Au nanoparticles) : 6 (DI water) solution. Figure S2. Scanning TEM images of the Si NW. (a) Energy dispersive scanning point of the Si NW. (b) Energy dispersive spectrum for each scanning point. Figure S3. (a) Schematic image of CV measurements system using Au film as a working electrode. (b) CV measurements of the Au film electrode in 100 mM K3Fe(CN)6. All CV measurements are taken with a scan rate of 20 mV/s. Figure S4. Schematic images of ion and electron transfer mechanism in the CV measurements system using Au film (a, b) and VSNEA (c, d) as a working electrode.

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Kim et al. Nanoscale Research Letters 2013 8:502   doi:10.1186/1556-276X-8-502