纳米孔对等离激元特性及SERS性能影响

The Influence of Nanopores on Plasmonic Characteristics and SERS Performance

纳米孔结构在比如生物传感器、增强光谱学等领域具有多种重要应用。然而,一方面,纳米孔的制备技术还很有限,尤其对于小于10nm的微孔;另一方面,纳米孔结构的电磁场增强特性研究较少,增强能力较低。在该组最近的工作中,通过化学合成方法,直接合成了具有尺寸可调的纳米孔结构,并对其等离激元特性进行了研究。通过对二维(2D)纳米粒子超晶格结构腐蚀及SERS性能原位探测,发现该结构腐蚀初期会形成一种"纳米孔-纳米间隙"耦合结构。该结构表现出一种杂化的等离子激元模式,并贡献附加的电磁场增强。该方法可以拓宽到其他材料的纳米孔结构制备,并开发基于纳米孔结构相关的多种应用。

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.Recently,using a facile chemical route,we synthesized nanopore structures with tunable nanpore sizes and positions.Using a facile chemical etching strategy on 2Dplasmonic Ag NP 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 SERS detection indicate that novel hybrid plasmon structure may create an enhanced electromagnetic coupling and increase SERS signal at^10× magnification.The facile etching strategy,as a common approach,may open the doors for fabrication of nanopores in various compositions for numerous applications.