Figure 5.
(a,b) UV-vis absorption of Au-Ag cluster @PVP-DOX, Au-Ag cluster @PEG400-DOX and it in PBS buffer at different pH value; (c,d) PL spectra of Au-Ag cluster @PVP-DOX, Au-Ag cluster @PEG400-DOX and it in PBS buffer at different PH.
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