Vertically Oriented TiOxNy Nanopillar Arrays with Embedded Ag Nanoparticles for Visible-Light Photocatalysis

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• 作者：Weitao Jiang ; Najeeb Ullah ; Giorgio Divitini ; Caterina Ducati ; R. Vasant Kumar ; Yucheng Ding ; Zoe H. Barber
• 刊名：Langmuir
• 出版年：2012
• 出版时间：March 27, 2012
• 年：2012
• 卷：28
• 期：12
• 页码：5427-5431
• 全文大小：359K
• 年卷期：v.28,no.12(March 27, 2012)
• ISSN：1520-5827

文摘

We present a straightforward method to produce highly crystalline, vertically oriented TiO_xN_y nanopillars (up to 1 渭m in length) with a band gap in the visible-light region. This process starts with reactive dc sputtering to produce a TiN porous film, followed by a simple oxidation process at elevated temperatures in oxygen or air. By controlling the oxidation conditions, the band gap of the prepared TiO_xN_y can be tuned to different wavelength within the range of visible light. Furthermore, in order to inhibit carrier recombination to enhance the photocatalytic activity, Ag nanoparticles have been embedded into the nanogaps between the TiO_xN_y pillars by photoinduced reduction of Ag⁺ (aq) irradiated with visible light. Transmission electron microscopy reveals that the Ag nanoparticles with a diameter of about 10 nm are uniformly dispersed along the pillars. The prepared TiO_xN_y nanopillar matrix and Ag:TiO_xN_y network show strong photocatalytic activity under visible-light irradiation, evaluated via degradation of Rhodamine B.