Figure 2
UV–Vis absorption and PL spectra and fluorescence decay profile of RNase A@C-dots. (a) UV–Vis absorption of the as-prepared RNase A@C-dots (black line) and RNase A treated by microwave for 4 min (red line). (b) PL spectra of the as-prepared RNase A@C-dots at excitation from 300 to 500 nm in 20-nm increment. Inset: image of the as-prepared RNase A@C-dot dispersion under visible light (left) and UV light (right). (c) Fluorescence decay profile (λex = 380 nm, λem = 450 nm) of the as-prepared RNase A@C-dots. (d) The effect of the solution pH value over the fluorescence (λex = 360 nm) of the as-prepared RNase A@C-dots.