纳米颗粒
表面增强拉曼光谱
纳米技术
材料科学
微尺度化学
拉曼光谱
星团(航天器)
等离子体子
同种类的
拉曼散射
光电子学
光学
物理
数学教育
热力学
计算机科学
程序设计语言
数学
作者
Yanling Wang,Yating Yu,Yue Liu,Shikuan Yang
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2018-10-17
卷期号:3 (11): 2343-2350
被引量:32
标识
DOI:10.1021/acssensors.8b00711
摘要
Nanoparticle clusters have important applications in plasmonics and optical sensing fields. Various methods have been used to construct nanoparticle clusters, represented by assembling preprepared nanoparticles using DNA. However, preparation of nanoparticle clusters using a one-step method is still challenging. Herein, by using prepatterned microscale bowls as individual reaction containers, clusters of Au nanoparticles with a homogeneous structure are electrodeposited at the bottom of each bowl. The structure of the nanoparticle clusters can be simply manipulated by varying electrodeposition parameters. After coating these Au nanoparticle cluster-in-bowl arrays with a thin layer of Ag film, they can be used as surface enhanced Raman spectroscopy (SERS) substrates with an SERS enhancement factor of ∼108. Importantly, the concave bowl structures can facilitate delivery of the analytes into the crevices between the bowls and the nanoparticle clusters where SERS “hot spots” (or sensitive sites) are located. The crevices with a gradually changed gap distance between the concave bowl structure and the nanoparticle clusters are excellent traps for catching and SERS sensing of biospecies with varied sizes (e.g., viruses and proteins). We demonstrated sensitive SERS detection of viruses and proteins using the nanoparticle-cluster-in-bowl SERS substrates. This technique has the ability to control the resulting structure at specific locations with electrodeposited materials, which enables new opportunities for assembling complex surface patterns with diverse applications in optical and plasmonic fields.
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