Fig. 3

Optimum incubation time for the synthesis of Av–Au NCs. A Time-dependent fluorescence spectra obtained from the synthesis of Av–Au NCs with excitation at 374 nm. Slit widths of excitation: 10 nm, slit widths of emission: 10 nm, and voltage: 700 V. B Time-dependent absorption spectra obtained from the synthesis of Av–Au NCs. C Time-dependent fluorescence spectra obtained from the synthesis of Av–Au NCs with excitation at 295 nm. Slit widths of excitation: 5 nm, slit widths of emission: 5 nm, and voltage: 650 V. D Growth mechanism for the synthesis of Av–Au NCs with blue fluorescence and red fluorescence