Spatial control of chemical processes on nanostructures through nano-localized water heating.
Spatial control of chemical processes on nanostructures through nano-localized water heating.
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DOI：
10.1038/ncomms10946
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发表时间：
2016-03-10
影响因子：
16.6
通讯作者：
Kadodwala M
中科院分区：
文献类型：
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作者：
Jack C;Karimullah AS;Tullius R;Khorashad LK;Rodier M;Fitzpatrick B;Barron LD;Gadegaard N;Lapthorn AJ;Rotello VM;Cooke G;Govorov AO;Kadodwala M
纳米光子器件的最佳性能，包括传感器和太阳能电池，需要最大化光和物质之间的相互作用。当有源部分被限制在电磁场(EM)受限的区域时，这种效率被优化。将物质限制在这些“热点”中以前是通过低效的“自上而下”的方法来完成的。在这里，我们报道了一种快速的“自下而上”的方法来功能化等离子体纳米结构的选择性区域，该方法使用脉冲激光照射引起的对周围水的纳米局域加热。这种局部加热在化学保护/去保护策略中被利用，以允许对纳米结构的选择性区域进行化学修饰。作为范例，我们使用该策略来增强手性等离子体底物的生物传感能力。这种新颖的空间选择性功能化策略为器件制造中在纳米尺度上对宏观区域进行高效的高通量化学控制提供了新的机会。人们普遍认为，快速消散意味着空间上的精确加热不可能通过热等离子手段实现。在这里，作者通过脉冲激光照射在等离子体纳米结构周围诱导高度局域加热，从而影响表面结合分子的化学修饰。
Optimal performance of nanophotonic devices, including sensors and solar cells, requires maximizing the interaction between light and matter. This efficiency is optimized when active moieties are localized in areas where electromagnetic (EM) fields are confined. Confinement of matter in these ‘hotspots' has previously been accomplished through inefficient ‘top-down' methods. Here we report a rapid ‘bottom-up' approach to functionalize selective regions of plasmonic nanostructures that uses nano-localized heating of the surrounding water induced by pulsed laser irradiation. This localized heating is exploited in a chemical protection/deprotection strategy to allow selective regions of a nanostructure to be chemically modified. As an exemplar, we use the strategy to enhance the biosensing capabilities of a chiral plasmonic substrate. This novel spatially selective functionalization strategy provides new opportunities for efficient high-throughput control of chemistry on the nanoscale over macroscopic areas for device fabrication. It is generally believed that rapid dissipation means that spatially precise heating is not feasible via thermoplasmonic means. Here, the authors induce highly localized heating around plasmonic nanostructures by pulsed laser irradiation, which effects chemical modification of surface bound molecules.