fig3
![Solid-state NMR of active sites in TiO<sub>2</sub> photocatalysis: a critical review](https://image.oaes.cc/aee4ec06-4c22-4959-90f1-d08b90ca3a45/cs4012.fig.3.jpg)
Figure 3. Experimental and simulated static Hahn-echo 47/49Ti NMR spectra of TiO2. The TiO2 nanoparticles were annealed before solid-state NMR experiments at variable temperatures. Reproduced with permission from[93]. Copyright 2001, American Chemical Society. NMR: Nuclear magnetic resonance.