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Engineered SERS substrates employing nanoparticle cluster arrays with multiscale signal enhancement
US9013689B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9013689-B2 |
| Application number | US-201013142939-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 11, 2010 |
| Priority date | Jan 9, 2009 |
| Publication date | Apr 21, 2015 |
| Grant date | Apr 21, 2015 |
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Abstract
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Defined nanoparticle cluster arrays (NCAs) with total lateral dimensions of up to 25.4 μm by 25.4 μm have been fabricated on top of a 10 nm thin gold film using template guided self-assembly. This approach provides precise control of the structural parameters in the arrays allowing a systematic variation of the average number of nanoparticles in the clusters (n) and the edge to edge separation (Λ) between 1<n<20 and 50 nm≦Λ≦1000 nm, respectively. Investigations of the Rayleigh scattering spectra and surface enhanced Raman scattering (SERS) signal intensities as a function of n and Λ reveal direct near-field coupling between the particles within individual clusters, whose strength increases with the cluster size (n) until it saturates at around n=4. Our analysis shows that strong near-field interactions between individual clusters significantly affects the SERS signal enhancement for edge-to-edge separations Λ<200 nm. The observed dependencies of the Raman signals on n and Λ indicate that NCAs support a multiscale signal enhancement which originates from simultaneous inter- and intra-cluster coupling and |E|-field enhancement. The NCAs provide strong SERS signals of bacterial cells thus enabling a rapid and reliable spectral identification of bacteria.
First claim
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What is claimed is: 1. A method of making a substrate for use in surface-enhanced Raman spectroscopy, comprising: forming a planar substrate layer; and using a template-guided chemical self-assembly process to create a nanoparticle cluster array of defined size with nanoscale inter-particle separations at predefined pattern locations on the planar substrate layer, the template-guided chemical self-assembly process including: forming a template on the planar substrate layer, the…
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- B82Y30/00Primary
Operations & Transport · mapped topic
- G01N21/658Primary
Physics · mapped topic
Cross-Sectional Technologies · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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- What does patent US9013689B2 cover?
- Defined nanoparticle cluster arrays (NCAs) with total lateral dimensions of up to 25.4 μm by 25.4 μm have been fabricated on top of a 10 nm thin gold film using template guided self-assembly. This approach provides precise control of the structural parameters in the arrays allowing a systematic variation of the average number of nanoparticles in the clusters (n) and the edge to edge separation …
- Who is the assignee on this patent?
- Reinhard Bjoern Markus, Dal Negro Luca, Univ Boston
- What technology area does this patent fall under?
- Primary CPC classification B82Y30/00. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Apr 21 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).