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arXiv 1107.4411cond-mat.mtrl-scicond-mat.mes-hallphysics.chem-ph
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N + S共掺杂TiO2纳米管阵列薄膜在可见光下的光电化学和光催化性能

Photoelectrochemical and photocatalytic properties of N + S co-doped TiO2 nanotube array films under visible light irradiation

Guotian Yan, Min Zhang, Jian Houa, Jianjun Yang

摘要:

本文报道了用硫脲处理TiO 2纳米管阵列薄膜,并在500 °C下真空煅烧3 h,实现了氮和硫的共掺杂。采用扫描电子显微镜、X射线衍射(XRD)、X射线光电子能谱学(XPS)和紫外-可见漫反射光谱对样品进行了表征。XPS分析表明,N以NTO和NOTi的形式共存,S以取代氧原子的方式进入TiO 2的晶格中。XRD分析表明,N + S共掺杂的TiO 2纳米管阵列的结晶度比未掺杂的TiO 2纳米管阵列的结晶度有所提高。在光电化学测试中,N + S共掺杂的TiO 2纳米管阵列薄膜在可见光照射下的光电流比未掺杂的样品有很大的提高。在可见光照射下,以亚亚甲蓝为目标染料,考察了样品的光催化活性。由于N、S的掺杂,N + S共掺杂的TiO 2纳米管阵列薄膜比未掺杂的TiO 2纳米管阵列薄膜具有更好的光催化活性。关键词:纳米结构;氧化物;薄膜;电化学性能

英文摘要:

In this paper, we report on the co-doping nitrogen and sulfur has been achieved in the TiO2 nanotube array films by treatment with thiourea and calcination under vacuum at 500 °C for 3 h. The samples were characterized by scanning electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy. XPS spectra revealed that N might coexist in the forms of NTiO and NOTi, S was incorporated into the lattice of TiO2 through substituting oxygen atoms in the N + S co-doped TiO2 nanotube array films. XRD patterns indicated that improved crystallinity was obtained for N + S co-doped TiO2 nanotube arrays as compared to that of undoped TiO2 nanotube arrays. In photoelectrochemical measurements, the photocurrent of N + S co-doped TiO2 nanotube array films was greatly enhanced compared to that of undoped samples under visible light irradiation. And the photocatalytic activities of the samples were evaluated on the removal of methylene blue under visible light irradiation. The N + S co-doped TiO2 nanotube array films showed a better photocatalytic activity than the undoped sample due to the N, S doping. Keywords: Nanostructures; Oxide; Thin films; Electrochemical properties

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