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Absorbance, excitation, and emission spectra of (a) Cys-AuNPs and (b) Gly-Cys-AuNPs. Excitation spectra: emission at 650 nm; emission spectra: excitation at 450 nm. (c) Zeta potential measurement of Cys-AuNPs and Gly-Cys-AuNPs at pH 9, where the maximum stability of Cys-AuNPs was achieved.
