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首页> 外文期刊>RSC Advances >Geometrical modifications and tuning of optical and surface plasmon resonance behaviour of Au and Ag coated TiO2 nanotubular arrays
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Geometrical modifications and tuning of optical and surface plasmon resonance behaviour of Au and Ag coated TiO2 nanotubular arrays

机译：Au和Ag包覆TiO2纳米管阵列的几何修饰和光学和表面等离子体共振行为的调整。

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摘要

A protocol for surface structuring and shape modifications of anodized TiO2 nanotubes by controlling the electric field is presented. The shape and size control of nanotubes is essential in order to achieve more control over optical and electronic properties of nanotubes such as effective band gap, light absorption capabilities, photoelectrochemical response, Raman properties, as well as appearance of the localized states. A surface plasmon resonance (SPR) study was performed using these newly developed nanotubes. It was observed that noble metal treated nanotube assemblies exhibit a 'slow photon effect' and plasmon-exciton interaction. Such a 'slow photon' effect is highly advantageous to improve photoelectrochemical (PEC) performance and quantum efficiency if plasmonic PEC activity is coupled with it in the SPR region. The FDTD simulations of tilted nanotubes suggest that the maximum surface field confinement can be realized for a lower bend angle of 8 degrees and this confinement diminishes when inclination of the nanotubes increases further.
机译：提出了通过控制电场对阳极氧化的TiO2纳米管进行表面结构化和形状改性的协议。为了更好地控制纳米管的光学和电子特性（例如有效带隙，光吸收能力，光电化学响应，拉曼特性以及局部状态的外观），纳米管的形状和尺寸控制至关重要。使用这些新开发的纳米管进行了表面等离子体共振（SPR）研究。观察到，经贵金属处理的纳米管组件表现出“慢光子效应”和等离子体激子相互作用。如果等离激元PEC活性在SPR区域中与其耦合，则这种“慢光子”效应对于提高光电化学（PEC）性能和量子效率非常有利。倾斜的纳米管的FDTD模拟表明，对于8度的较低弯曲角，可以实现最大的表面场限制，并且当纳米管的倾斜度进一步增加时，该限制会减小。

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