Fig. 1. Light-induced reversible assembly of 10.9 nm cationic AuNPs. (a) UV-Vis spectra of AuNP/photoacid solution before and after irradiation. (b) Zeta potential change of AuNPs upon three cycles of irradiation. Irradiation: table lamp for 5 min. (c) Photographs of the AuNP/photoacid solution in a disposable cuvette. White arrows: direction of irradiation. (d), (e) Representative TEM images of cationic AuNPs in the dark and after irradiation.
