动态多级周期纳米棒阵列及其SERS研究

Smart Response of a Hierarchically Structural Nanorod Array for Surface-Enhanced Raman Scattering

具有"热点"结构的有序纳米图案由于其高灵敏度和高重复性可以作为表面增强拉曼散射(SERS)基底。基于多级周期阳极氧化铝模板独特的三维孔道,以聚合物复制其多级结构,得到具有一定长径比的纳米棒阵列,并蒸镀贵金属银获得SERS活性。通过精确调控多级周期纳米棒阵列周期内和周期间纳米棒的间距,使纳米棒在等离子体驱动过程中以周期为单位转变为"闭合"状态,从而实现动态响应过程并获得高效SERS活性位点。该动态响应基底有望进一步发展为智能等离激元器件。

The ordered nanostructure with'hot spot'is often used as surface-enhanced Raman scattering(SERS)substrate owing to the high sensitivity and reproducibility.A hierarchically structural nanorod array was fabricated by depositing Ag on a patterned PMMA nanorod which copied the structure of a honeycomb-like anodic aluminum oxide(AAO)template.During the smart response process,the nanorods bend and assemble inwards due to regulating the gaps between nanorods precisely,thus achieving high sensitivity SERS substrate.This smart response substrate shows a prospect in the fabrication of smart plasmonic device.