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(A) Time-dependent change of absorbance at 652 nm and (B) absorbance spectra of different mixture solutions of NGQDs, H2O2, and TMB after 10 min reaction. Inset in b are photographs of TMB solution in the presence of NGQDs (left), H2O2 (middle), and NGQDs + H2O2 (left). (C) Fluorescence spectra obtained in TA, H2O2, TA + H2O2, and TA + H2O2+NGQDs solutions. (D) EPR spectra obtained in the mixture of DMPO and H2O2 in absence or presence of NGQDs.
