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Refreshing gold nanoparticles. (a) Aging by adatoms (red) is reversed by adding HAuCl4 to preformed CB[5]:AuNP aggregates assembled from aged AuNPs, followed by boiling for 5 min. (b) Model of aging/reversal process showing changing citrate coordination. (c) In situ time-dependent monitoring of SERS spectra during auric chloride etching (reactivation), with (d) SERS strengths from CB[5], 1080 cm–1 adatom, and 995 cm–1 gap-spanning citrate peaks.
