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UV (A) and FL (B) spectra of the pristine assembling particles of the S dots (black) and APE-S dots(red); inset is the enlarged FL spectra of the S dots. (C) FL spectra (excited at 365 nm) of the APE-S dots, which were produced using different Cu2+ concentrations (0.1–1.0 mM); inset denotes the histogram of FL intensity vs different Cu2+ concentrations. (D) FL spectra of the APE-S dots under different excitation wavelengths from 320 to 450 nm.
