Highly Localized SERS Measurements Using Single Silicon Nanowires Decorated with DNA Origami-Based SERS Probe

Highly Localized SERS Measurements Using Single Silicon Nanowires Decorated with DNA Origami-Based SERS Probe

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 th...

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Bibliographic Details
Published in:Nano letters Vol. 19; no. 2; pp. 1061 - 1066
Main Authors: Moeinian, Ardeshir, Gür, Fatih N, Gonzalez-Torres, Julio, Zhou, Linsen, Murugesan, Vignesh D, Dashtestani, Ashkan Djaberi, Guo, Hua, Schmidt, Thorsten L, Strehle, Steffen
Format: Journal Article
Language:English
Published: United States American Chemical Society 13-02-2019
Subjects:
silicon nanowire
DNA origami
gold nanoparticles
Surface enhanced Raman spectroscopy
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Summary: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.8b04355