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. 2021 Mar 5;11(16):9664–9674. doi: 10.1039/d1ra00013f

Fig. 4. (a) The absorbance ratio of A640/520 for the AuNPs over the concentration range of Cys between 0.005 and 20 000 μM before and after adding Cu2+ ions (0.1 mM, 1.0 mM). TEM images of AuNPs with 1.5 μM Cys (b) before and (c) after adding Cu2+ at 1.0 mM.

Fig. 4