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(a) Particle size measurements, by DLS, TEM images of nanoclusters after (b) 60% and (c) 100% solvent evaporation, and (d) UV-vis absorbance spectra of nanoclusters composed of citrate/lysine-capped nanoparticles assembled using PEG homopolymer (MW=3350). The starting gold and polymer concentrations were 3 mg/mL and 50 mg/mL, respectively.
