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(a) UV-Vis spectra of a colloidal solution of QUC 50 μM in 50 mM PBS buffer pH (blue curve) and of AgNPs (diluted 1:4) (red curve); (b) UV-Vis spectra of a colloidal solution of AgNPs after 20 min (diluted 1:4) in 50 mM PBS at pH 7 obtained with different concentrations of AgNO3.
