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/srep24253
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发表时间：
2016-01-28
影响因子：
4.6
通讯作者：
Fan, Tongxiang
中科院分区：
文献类型：
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作者：
Yan, Runyu;Chen, Min;Fan, Tongxiang
以往的研究已经讨论了与认知障碍相关的因素，但其发展模式却很少描述。我们的目的是研究认知功能的长期发展和相关因素，使用纵向随访数据。应用基于组的轨迹模型和多项逻辑回归来识别轨迹和相关的基线因素，并使用混合模型来识别与轨迹相关的时变因素。确定了三种轨迹：起始低和下降（30.8%），起始高和下降（51.8%）和高稳定（17.4%）。这三个轨迹在研究开始时很明显，在研究期间没有交叉。吸烟、糖尿病、抑郁和工具性日常生活活动是区分高起点和下降组与高稳定组的重要变量。相似的模式和情感支持作为一个贡献变量，观察到在开始低和下降组。随着时间的推移，身体活动，自测健康，心血管疾病，抑郁评分，身体功能和社会支持与轨迹有关。躯体功能受损、心血管疾病、抑郁症状、晚年社会支持不足可能是影响认知功能下降的潜在危险因素。利用占太阳能40%左右的远红外-近红外（NIR）光，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，结构效应对远红外到近红外光谱的增强有明显的影响，主要表现在：（1）增强远红外到近红外（700 nm与1200 nm相似）的捕获，最高可达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。
Previous research has discussed the factors associated with cognitive impairment, but the patterns of its development have been little described. Our aim was to examine long-term development of cognitive function and the related factors using longitudinal follow-up data. A group-based trajectory model and multinomial logistic regression were applied to identify trajectories and the associated baseline factors, and a mixed model was used to identify the time-varying factors associated with the trajectories. Three trajectories were identified: starting low and declining (30.8%), starting high and declining (51.8%), and high-stable (17.4%). These three trajectories were apparent at the beginning of the study and did not crossover during the study period. Smoking, diabetes, depression, and instrumental activities of daily living were significant variables for differentiating the starting high and declining group from the high-stable group. Similar patterns and emotional support as a contributing variable were observed in the starting low and declining group. Physical activity, self-rated health, cardiovascular diseases, depression score, physical function, and social support were related to the trajectories over time. Impaired physical function, cardiovascular diseases, depression symptom, and poor social support in late life may be potential risk factors affecting the decline of cognitive function. Preventive strategies should be designed accordingly.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 similar to 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.