Bio-inspired Plasmonic Nanoarchitectured Hybrid System Towards Enhanced Far Red-to-Near Infrared Solar Photocatalysis.
Bio-inspired Plasmonic Nanoarchitectured Hybrid System Towards Enhanced Far Red-to-Near Infrared Solar Photocatalysis.
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DOI：
10.1038/srep20001
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发表时间：
2016-01-28
影响因子：
4.6
通讯作者：
Fan T
中科院分区：
文献类型：
--
作者：
Yan R;Chen M;Zhou H;Liu T;Tang X;Zhang K;Zhu H;Ye J;Zhang D;Fan T
利用远红-近红外（NIR）光（约占太阳能的40%）将太阳能转化为燃料或半导体中的电力是非常重要的。一个主要的挑战是开发新的战略活动的促进和新的基本机制的近红外响应。由于独特的微/纳米架构，大自然已经进化到通过其智能系统巧妙地捕获远红光到近红外光，从而激励我们进行仿生设计。在这里，我们报告了一种新策略的第一次演示，该策略基于采用大自然的远红外到近红外响应架构，用于高效的生物启发光催化系统。该系统是通过将捕光等离子体纳米天线控制组装到具有蝴蝶翅膀的3D微/纳米架构的典型光催化单元上来构建的。实验和时域有限差分（FDTD）模拟结果表明，结构效应对远红外-近红外光谱（700~1200 nm）的吸收增强效果显著，其主要原因是：（1）远红外-近红外光谱（700~1200 nm）吸收增强25%; (2)将局域表面等离子体激元（LSP）的电场幅度增强到非结构化LSP的3.5倍以上，这促进了电子-空穴对形成的速率，从而显著增强了电子-空穴对。这一概念验证研究为近红外探测提供了一种新的方法，并可能指导未来概念上新的近红外响应系统设计。
Solar conversion to fuels or to electricity in semiconductors using far red-to-near infrared (NIR) light, which accounts for about 40% of solar energy, is highly significant. One main challenge is the development of novel strategies for activity promotion and new basic mechanisms for NIR response. Mother Nature has evolved to smartly capture far red-to-NIR light via their intelligent systems due to unique micro/nanoarchitectures, thus motivating us for biomimetic design. Here we report the first demonstration of a new strategy, based on adopting nature’s far red-to-NIR responsive architectures for an efficient bio-inspired photocatalytic system. The system is constructed by controlled assembly of light-harvesting plasmonic nanoantennas onto a typical photocatalytic unit with butterfly wings’ 3D micro/nanoarchitectures. Experiments and finite-difference time-domain (FDTD) simulations demonstrate the structural effects on obvious far red-to-NIR photocatalysis enhancement, which originates from (1) Enhancing far red-to-NIR (700~1200 nm) harvesting, up to 25%. (2) Enhancing electric-field amplitude of localized surface plasmon (LSPs) to more than 3.5 times than that of the non-structured one, which promotes the rate of electron-hole pair formation, thus substantially reinforcing photocatalysis. This proof-of-concept study provides a new methodology for NIR photocatalysis and would potentially guide future conceptually new NIR responsive system designs.