Figure 4
(a) CV spectra at a scan rate of 100 mV·s−1, (b) Absorption and emission spectra of GQDs(Y) and GQDs(W), (c) PL spectra of GQDs(W) following different excitation wavelength, the inset shows the fluorescent image of GQDs(W) aqueous solution at λex = 365 nm, (d) fluorescent lifetime of GQDs(W) at λex = 365 nm.
