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Schematic illustrations and TEM images of the products resulting from: (a) the click reaction between alkyne-functionalized PNPs and azide-modified AuNPs in the presence of a Cu/NaAsc catalyst and (b) the analogous reaction in the absence of the catalyst. The former TEM image clearly shows attachment of AuNPs to PNPs, while the latter displays non-specific interactions between AuNPs and PNPs.
