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. 2015 Oct 12;5:15123. doi: 10.1038/srep15123

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(a) Plot of the values of φ_b with respect to applied voltage under illumination with UV light at various power densities. (b) Values of φ_b0 plotted with respect to the illumination power density; data were obtained from (a); inset: plot of Δφ_b0 (the difference between the values of φ_b0 under UV light and in the dark) with respect to the power density of the UV light.