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首页> 外文期刊>Nanotechnology >Heterojunctions of mixed phase TiO2 nanotubes with Cu, CuPt, and Pt nanoparticles: interfacial band alignment and visible light photoelectrochemical activity
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Heterojunctions of mixed phase TiO2 nanotubes with Cu, CuPt, and Pt nanoparticles: interfacial band alignment and visible light photoelectrochemical activity

机译：用Cu，Cupt和Pt纳米粒子混合相TiO2纳米管的杂结：界面带对准和可见光光电化学活性

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摘要

Anodically formed, vertically oriented, self-organized cylindrical TiO2 nanotube arrays composed of the anatase phase undergo an interesting morphological and phase transition upon flame annealing to square-shaped nanotubes composed of both anatase and rutile phases. This is the first report on heterojunctions consisting of metal nanoparticles (NPs) deposited on square-shaped TiO2 nanotube arrays (STNAs) with mixed rutile and anatase phase content. A simple photochemical deposition process was used to form Cu, CuPt, and Pt NPs on the STNAs, and an enhancement in the visible light photoelectrochemical water splitting performance for the NP-decorated STNAs was observed over the bare STNAs. Under narrow band illumination by visible photons at 410 nm and 505 nm, Cu NP-decorated STNAs performed the best, producing photocurrents 80% higher and 50 times higher than bare STNAs, respectively. Probing the energy level structure at the NP-STNA interface using ultraviolet photoelectron spectroscopy revealed Schottky barrier formation in the NP-decorated STNAs, which assists in separating the photogenerated charge carriers, as also confirmed by longer charge carrier lifetimes in NP-decorated STNAs. While all the NP-decorated STNAs showed enhanced visible light absorption compared to the bare STNAs, only the Cu NPs exhibited a clear plasmonic behavior with an extinction cross section that peaked at 550 nm.
机译：由锐钛矿相的阳极形成，垂直定向的自组织圆柱形TiO2纳米管阵列经历了在火焰退火到由锐钛矿和金红石相组成的方形纳米管时进行有趣的形态和相变。这是第一报告，其包括沉积在方形TiO2纳米管阵列（STNA）上的金属纳米颗粒（NPS），其具有混合润孔和锐钛矿相含量。在STNA上使用简单的光化学沉积过程来形成Cu，Cupt和Pt NP，并且在裸露的STNA上观察到NP装饰STNA的可见光光电化学水分解性能的增强。在410nm和505nm的可见光子下的窄带照射下，Cu NP装饰的STNA是最佳的，产生光电流80％，分别比裸静STNA高50倍。使用紫外光电和光电子谱探测NP-STNA界面的能量水平结构揭示了NP装饰STNA中的肖特基势垒形成，其有助于分离光催化的电荷载流子，还通过较长的电荷载体寿命在NP装饰的STNA中确认。虽然与裸露的STNA相比，所有NP装饰的STNA显示出增强的可见光吸收，但只有Cu NPS呈现出透明的等离子体行为，其消光横截面以550nm达到峰值。

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