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SEM images of gold nanospheres deposited for 30 min from a diluted suspension onto (a) a spherical surface ( 129 μm, 10% dilution from ), (b) a cylindrical surface ( 5.2 μm, 3% dilution), and (c) a planar surface (30% dilution). The curved surfaces consist of (d) a 258 μm diameter microsphere and (e) a tapered optical fiber, 24.2 μm in diameter at the point where the image was taken.
Plot comparing the theoretical scaling in Eq. (3) with data obtained from planar, cylindrical, and spherical surfaces. The only fitting parameter was .
Plots of the nanoparticle coverage on three different fiber tapers as a function of the local curvature, and for different deposition times. As in Fig.2, the only fitting parameter was . The strong dependence of particle density on curvature is particularly clear here. The inset SEM images are of 2 μm × 2 μm areas and are taken from the micrographs used to generate the indicated data points.
Concentration of gold nanoparticles in stock solution as determined by TEM and ICP-AES as well as adsorption on different surface geometries and fitted to our model.
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