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Analysis by transmission electron microscopy (TEM). a) Ad-grafted 2 nm Au colloids: the inorganic building blocks of Au-SNPs. b) A single 118 nm Au-SNP obtained by the supramolecular synthetic approach. c) Titration plot showing the relationship between the size of Au-SNPs and the mixing ratio of the Au colloids and CD-PEI. d,e) Effect of temperature (d) and the pH value (e) on the stability of 118 nm Au-SNPs.
