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TiO2 on Gold Nanostars Enhances Photocatalytic Water Reduction in the Near-Infrared Regime
Chem ( IF 23.5 ) Pub Date : 2018-07-12 , DOI: 10.1016/j.chempr.2018.06.004
Supriya Atta , Ashley M. Pennington , Fuat E. Celik , Laura Fabris

The growth of a conformal layer of crystalline TiO2 on gold nanostars was achieved by a simple hydrothermal route preserving the large aspect ratio of the protruding spikes of the nanostar and enabled the photocatalytic evolution of hydrogen under near-infrared (NIR) illumination. The delicate structure of the underlying nanostars is otherwise extremely sensitive to atom migration. It has been revealed that the (101) crystal plane of anatase TiO2 grows epitaxially on the surface of gold, and TiO2 layer thickness and crystallinity can be controlled by varying synthesis conditions. TiO2-coated gold nanostars ([email protected]2) displayed significantly enhanced photocatalytic activity under visible-NIR illumination compared with reported TiO2-coated gold nanoparticles and commercially available TiO2 nanoparticles. The high photocatalytic activity is attributed to effective hot electron generation via absorption of radiation via localized surface plasmon resonance modes of the spikes and further injection to the conduction band of the TiO2 shell across the gold nanoparticle-TiO2 interface.



中文翻译:

金纳米星上的TiO 2增强了近红外条件下的光催化水还原作用

通过简单的水热途径,保留了纳米星突出的长钉的大的长宽比,并在近红外(NIR)照射下实现了光催化氢的析出,金纳米星上的TiO 2结晶共形层的生长得以实现。潜在的纳米星的微妙结构对原子迁移极为敏感。已经发现,锐钛矿型TiO 2的(101)晶面在金的表面上外延生长,并且可以通过改变合成条件来控制TiO 2的层厚和结晶度。TiO 2涂层金纳米星([受电子邮件保护] 2)与报道的TiO 2包覆的金纳米颗粒和可商购的TiO 2纳米颗粒相比,在可见-NIR照射下显示出显着增强的光催化活性。高的光催化活性归因于通过尖峰的局部表面等离子体激元共振模式吸收辐射并通过金纳米颗粒-TiO 2界面进一步注入TiO 2壳的导带,从而产生了有效的热电子。

更新日期:2018-07-12
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