Figure 1

The influence of sodium borohydride concentration on the formation of blue emitters. To a C24-Ag solution (50 μM, 1 mL), varied volumes of aqueous sodium borohydride solutions (1 mg/mL) were added. The solutions were left overnight at room temperature to achieve stable red emissions, and then hydrogen peroxide was added with a final concentration of 5 mM. An emission intensity of 340 nm excitation was recorded 5 h later. The numbers indicate the volume of aqueous sodium borohydride solution in microliters.