Average crystallite size and Eg values with Cu concentration.
| Cu : TiO2 | Crystallite size (nm) | E g (eV) |
|---|---|---|
| 0 : 1 | 22.22 | 3.1 |
| 0.03 : 1 | 20.09 | 2.8 |
| 0.06 : 1 | 18.17 | 2.6 |
| 0.09 : 1 | 15.47 | 2.4 |
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