Figure 1.

Schematic of two neighboring AuNPs coated with adsorbed PEG. RAuNPs is the radius of the AuNPs, L is the nanoparticle center-to-center separation distance, H is the separation distance between the nanoparticle surface (H = L − 2RAuNPs), and t is the thickness of the adsorbed PEG layer.

Ling et al. Nanoscale Research Letters 2013 8:538   doi:10.1186/1556-276X-8-538
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