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DLS and TGA measurements of PEG-coated AuNPs, SEM image of aligned 20 nm AuNPs on wrinkled graphene, and polarized UV–Vis spectra. PEG hydrodynamic thickness in ethanol on 20–80 nm AuNPs determined by DLS (a). PEG grafting density determined by TGA (b). SEM (c) and UV–Vis spectra (d) of 20 nm AuNPs capped with 40k PEG on graphene. Scale bar 500 nm. Error bars are the standard deviation of 3 replicates.
