Fig. 2. Characterization. (A) Photographs of the PheDH-AuNCs aqueous solutions under (a) visible and (b) UV light; the insets show PheDH-AuNCs in powder form under visible and UV light. (B) Absorption (blue line) and emission spectra (red line, λex = 360 nm) of PheDH-AuNCs. (C) TEM image of the as-prepared PheDH-AuNCs. (D) XPS spectrum of Au 4f region for PheDH-AuNCs. (E) Far UV-CD spectra of PheDH and PheDH-AuNCs.
