Fig. 7. EPR spectra of GOQD and rGOQD solutions (1 mg mL−1 in water) in the presence of DMPO that are collected (A) in the dark and (B) after photoirradiation by 400 nm light for 1 min. In panel (B), the # and * symbols denote signals from intrinsic phenalenyl species and DMPO/hydroxyl radical adducts, respectively. Panel (C) shows the corresponding peak-to-peak intensities for hydroxyl adduct after photoirradiation in (B).
