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Low magnification scanning electron microscopy (SEM) images of (a) 2D arrays made of single nanoparticles (Au colloid of 115 ± 20 nm) and (b) 2D arrays constituted of nanoparticle clusters (Au colloids of 30 ± 2 nm). Lattice parameter in both cases is 500 nm. Scale bar = 2 μm. A statistical analysis of the SEM images is presented in SI Figure S6.
