Enhancement of visible light-induced surface photo-activity of nanostructured N-TiO₂ thin films modified by ion implantation

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• 作者：Pablo Romero-Gomez ; Carmen Lopez-Santos ; Ana Borras ; Juan Pedro Espinos ; Alberto Palmero ; Agustin R. Gonzalez-Elipe
• 刊名：Chemical Physics Letters
• 出版年：2013
• 出版时间：4 September, 2013
• 年：2013
• 卷：582
• 期：Complete
• 页码：95-99
• 全文大小：864 K

文摘

This work reports the morphological and chemical modifications induced in TiO₂ thin films by bombardment with high energy N⁺ ions at different temperatures and their different photo-activity responses after implantation under visible and UV light illumination. When implanted samples are illuminated with visible light, no dye photo-decolouration takes place despite that light transformed the surfaces from hydrophobic to hydrophilic. In agreement with the Wenzel model of wetting, correlation is found between visible light photo-activity and film morphology. We conclude that the photo-activity response can be separated into shallow and Schottky barrier photo-activity, this latter involving a thicker layer of material.