Fig. 8
From: Graphene quantum dot nanocomposites: electroanalytical and optical sensor technology perspective
(Reproduced with permission from Ref. Jin et al. 2022, Copyright 2022, Elsevier)
a SERS spectra for the oxTMB catalyzed by Ag/o-GQDs in the presence of H2O2 (3 mM). The time interval between successive curves is 2 min. b SERS spectra for the oxTMB catalyzed by Ag/o-GQDs with the H2O2 concentration range (3–30 nM). Inset: Quantitative analysis plot of oxTMB at 1605 cm−1 with different H2O2 concentrations, Error bars = SD, n = 3. c Schematic diagram of the SERS-active Ag/o-GQDs nanozyme-triggered in situ catalytic oxTMB for cancer cell H2O2 detention and ROS-mediated therapy. d SERS spectra for the oxidation of TMB catalyzed by Ag/o-GQDs in MCF-7 cells treated with various concentrations of the exogenous introduction of H2O2 (1–1000 μM). e Plots of the SERS response of oxTMB at 1605 cm−1 catalyzed by Ag/o-GQDs in MCF-7 cells treated with various concentrations of H2O2. f SERS spectra for the oxTMB catalyzed by Ag/o-GQDs in MCF-7 cells treated with the various concentrations of PMA (0–80 μg/mL). g Plots of the SERS response of oxTMB at 1605 cm−1 catalyzed by Ag/o-GQDs with H2O2 release from MCF-7 cells upon the stimulation of PMA