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119Sn MAS SSNMR spectra of SnO2 samples prepared at (a) 160 °C (MAS 5 kHz); (b) 180 °C (MAS 5 kHz); (c) 160 °C (MAS 12 kHz); (d) 180 °C (MAS 12 kHz); (e) 200 °C (MAS 12 kHz); and (f) 260 °C (MAS 12 kHz). Unlike other samples, the sample prepared at 180 °C was subsequently annealed at 240 °C for 72 h.
