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In the present work we investigate various optical properties (such as lightabsorption and reflectance) of anodic TiO2 nanotubes layers directlytransferred as self-standing membranes onto quartz substrates. This allowsinvestigation in a transmission geometry which provides significantly morereliable data than measurements on the metallic Ti substrate. Lighttransmission and reflectance measurements were carried out for layers ofthicknesses varying from 1.8 to 50 micrometer, and the layers were investigatedin their amorphous and crystalline form. A series of wavelength-dependent lightattenuation coefficients are extrapolated and found to match the photocurrentvs. irradiation wavelength behavior. However, a feature specific to anodicnanotubes is that their intrinsic carbon content causes a sub-bandgap responsethat is proportional to the carbon contamination content in the TiO2 nanotubes.Overall the extracted data provide valuable basis and understanding for thedesign of photo-electrochemical devices based on TiO2 nanotubes.

Addendum: Free‐Standing Membranes to Study the Optical Properties of Anodic TiO 2 Nanotube Layers