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(a) FQEs obtained during the degradation of stearic acid under the UVA irradiation of Cu:TiO2 and undoped thin films. Blank glass and Activ samples are included for comparison. (b) IR spectra of stearic acid upon UVA illumination (I = 3.15 mW·cm–2) on a typical Cu-doped TiO2, 5% Cu:TiO2.
