纳米技术
材料科学
表面增强拉曼光谱
拉曼光谱
小型化
DNA折纸
硅
纳米颗粒
胶体金
基质(水族馆)
纳米线
纳米结构
光电子学
拉曼散射
光学
地质学
物理
海洋学
作者
Ardeshir Moeinian,Fatih N. Gür,Julio César González-Torres,Linsen Zhou,Vignesh D. Murugesan,Ashkan Djaberi Dashtestani,Hua Guo,Thorsten L. Schmidt,Steffen Strehle
出处
期刊:Nano Letters
[American Chemical Society]
日期:2019-01-08
卷期号:19 (2): 1061-1066
被引量:34
标识
DOI:10.1021/acs.nanolett.8b04355
摘要
Surface enhanced Raman spectroscopy (SERS) measurements are conventionally performed using assemblies of metal nanostructures on a macro- to micro-sized substrate or by dispersing colloidal metal nanoparticles directly onto the sample of interest. Despite intense use, these methods allow neither the removal of the nanoparticles after a measurement nor a defined confinement of the SERS measurement position. So far, tip enhanced Raman spectroscopy is still the key technique in this regard but not adequate for various samples mainly due to diminished signal enhancement compared to other techniques, poor device fabrication reproducibility, and cumbersome experimental setup requirements. Here, we demonstrate that a rational combination of only four gold nanoparticles (AuNPs) on a DNA origami template, and single silicon nanowires (SiNWs) yield functional optical amplifier nanoprobes for SERS. These nanoscale SERS devices offer a spatial resolution below the diffraction limit of light and still a high electric field intensity enhancement factor ( EF) of about 105 despite of miniaturization.
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