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. 2018 Oct 15;3(10):13227–13238. doi: 10.1021/acsomega.8b02122

Table 3. Optical Band Gap (Eg) of the SnO2 NP Specimens, as Calculated from the UV–Vis Data Using the Tauc Procedure.

  optical Eg (eV)
synthesis temperature (°C) direct, γ = 1/2 indirect, γ = 2
160 3.12 ± 0.02 2.22 ± 0.02
180 3.67 ± 0.03 2.90 ± 0.03
220 3.86 ± 0.03 3.30 ± 0.02
240 3.90 ± 0.02 3.40 ± 0.02
260 3.99 ± 0.02 3.53 ± 0.02