Fig. 3: 1H NMR and EPR spectra to explore the effect of oxygen vacancy of ZnO nanorods on the 1H resonance at 8.4 ppm.
From: Active bridging hydride species in ZnO nanorods originated from hydroxyl and oxygen vacancy
a 1H NMR spectra of ZnO nanorods with different heating conditions to study the effect of oxygen vacancy concentration on the spectral intensity at 8.4 ppm. b EPR spectra of ZnO-200-vac and ZnO-200 samples. c The corresponding EPR spectra of ZnO nanorods used in d before 200 °C thermal treatment under vacuum. d 1H NMR spectra of ZnO nanorods with different initial oxygen vacancy concentration, then being heated at 200 °C, to study the effect of different concentration of oxygen vacancy before 200 °C vacuum on the spectral intensity at 8.4 ppm. “(ZnO-300-vac)-SW-200-vac)” represents the sample of ZnO-300-vac after being exposed to a small amount of water, then being heated at 200 °C under vacuum. “(ZnO-300-vac)-LW−200-vac” corresponds to ZnO-300-vac after being exposed to saturated water, then being heated at 200 °C under vacuum. For each NMR spectrum, recycle delays of 5 s were used, and 64 scans were collected.
