Real-Time Probing Nanopore-in-Nanogap Plasmonic Coupling Effect on Silver Supercrystals with Surface-Enhanced Raman Spectroscopy
Real-Time Probing Nanopore-in-Nanogap Plasmonic Coupling Effect on Silver Supercrystals with Surface-Enhanced Raman Spectroscopy
复制标题
利用表面增强拉曼光谱实时探测银超晶的纳米间隙中的纳米孔等离子体耦合效应
DOI：
10.1002/adfm.201603233
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发表时间：
2017-01-01
影响因子：
19
通讯作者：
Fang, Jixiang
中科院分区：
文献类型：
--
作者：
Ma, Cong;Gao, Qiangqiang;Fang, Jixiang
纳米孔结构在纳米孔生物传感器和增强型光谱学等重要应用中显示出诱人的前景。然而，一方面，到目前为止，获得亚10 nm尺寸的纳米孔的制造技术非常有限。另一方面，纳米孔的电磁增强仍然相对较低。在这项工作中，使用一个简单的化学蚀刻策略的2D等离子体银纳米粒子超晶体，细纳米孔阵列与亚10 nm孔径已成功制造和“nanopore-in-nanogap”混合等离子体模式进行了研究。原位蚀刻和表面增强拉曼光谱（Sers）检测表明，新型混合等离子体激元结构可以产生增强的电磁耦合，并在近似10倍放大率下增加Sers信号。等离激元键偶极模的断裂和类反键等离激元模的产生有助于这种增强的电磁耦合。作为一种常见的方法，容易的蚀刻策略可以为在各种组合物中制造纳米孔以用于许多应用打开大门。
Nanopore structures have displayed attractive prospects in diverse important applications such as nanopore-based biosensors and enhanced spectroscopy. However, on the one hand, the fabrication techniques to obtain sub-10 nm sized nanopores so far is very limited. On the other hand, the electromagnetic enhancement of nanopores is still relatively low. In this work, using a facile chemical etching strategy on 2D plasmonic Ag nanoparticle supercrystals, fine nanopore arrays with sub-10 nm pore size have been successfully fabricated and a "nanopore-in-nanogap" hybrid plasmon mode has been investigated. An in situ etching and surface-enhanced Raman spectroscopy (SERS) detection indicate that novel hybrid plasmon structure may create an enhanced electromagnetic coupling and increase SERS signal at approximate to 10x magnification. The breaking of plasmon bonding dipolar mode and generation of antibonding-like plasmon mode contribute to this enhanced electromagnetic coupling. The facile etching strategy, as a common approach, may open the doors for the fabrication of nanopores in various compositions for numerous applications.