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| - Fabrication of Highly Ordered TiO2 Nanotube Arrays Using an Organic Electrolyte
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| - Anodization of titanium in a fluorinated dimethyl sulfoxide (DMSO) and ethanol mixture electrolyte isinvestigated. The prepared anodic film has a highly ordered nanotube-array surface architecture. Using a 20V anodization potential (vs Pt) nanotube arrays having an inner diameter of 60 nm and 40 nm wall thicknessare formed. The overall length of the nanotube arrays is controlled by the duration of the anodization, withnanotubes appearing only after approximately 48 h; a 72 h anodization results in a nanotube array approximately2.3 μm in length. The photoelectrochemical response of the nanotube-array photoelectrodes is studied usinga 1 M KOH solution under both UV and visible (AM 1.5) illumination. Enhanced photocurrent density isobserved for samples obtained in the organic electrolyte, with an UV photoconversion efficiency of 10.7%.
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