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. 2015 Oct 26;5:15288. doi: 10.1038/srep15288

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(a) ln(C/C₀) versus time curves under UV-visible irradiation acquired from the TiO₂/Al films at 40 V, 60 V, 80 V, 100 V and flat TiO₂/Al film without nano-voids and with no film. (b) Corresponding photocatalytic rate versus the TiO₂/Al film fabrication voltage/nano-void diameter scale.