Fig. 6From: Preparation and Specific Capacitance Properties of Sulfur, Nitrogen Co-Doped Graphene Quantum DotsPL spectra of a GQDs, b S, N-GQDs-1, c S, N-GQDs-2, and d S, N-GQDs-3 under different excitation light; e PL spectra of GQDs and different doping ratio of S, N-GQDs at 320 nm excitation; f the trend of PL intensity variation of GQDs and different doping ratios S and N-GQDs at 320 nm excitationBack to article page