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SEM images of AuNPs and the calculated distance between them: (A) single-layered AuNPs (s-AuNPs) between electrodes before growth; (B) high-magnification view of in situ seed-assisted growing (sg-AuNPs) between electrodes after 2 min growth; (C) the nanoparticle diameters of s-AuNPs and sg-AuNPs; (D) the distance of nanogap between each AuNP. Reprinted with permission from [86]. Copyright (2008) Elsevier B.V.
