Fig. 2

a Time-dependent UV–visible spectra of the solution containing SP/GOx NPs, H₂O₂, and TMB ([TMB] = 0.25 mmol, [H₂O₂] = 1.00 mmol, SP/GOx NPs: 0.15 mg). b Electron spin resonance spectra of •OH trapped by DMPO in SP/GOx NPs + PBS + GO (blue line), SP/GOx NPs + PBS (red line) and PBS (black line). c CLSM image of •OH generation in HeLa cells after different treatments with DCFH-DA as the probe