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Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas

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Near-Field Surface-Enhanced Raman Imaging of Dye-Labeled DNA with 100-nm Resolution.

V Deckert¹, D Zeisel, R Zenobi

¹Laboratorium für Organische Chemie, ETH Zürich, Universitätsstrasse 16, CH-8092 Zürich, Switzerland.

Analytical Chemistry

|June 8, 2011

Summary

This summary is machine-generated.

Researchers demonstrate 100 nm scale Raman chemical imaging for the first time using scanning near-field optical microscopy (SNOM) and surface-enhanced Raman scattering (SERS). This breakthrough enables high-resolution chemical analysis of materials at the nanoscale.

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Area of Science:

Nanotechnology
Spectroscopy
Chemical Imaging

Background:

Achieving nanoscale chemical information is crucial for understanding material properties.
Conventional Raman spectroscopy lacks the spatial resolution for nanoscale imaging.
Surface-enhanced Raman scattering (SERS) enhances Raman signals but typically requires close proximity to metallic nanostructures.

Purpose of the Study:

To demonstrate Raman chemical imaging at a 100 nm scale for the first time.
To combine scanning near-field optical microscopy (SNOM) with SERS for ultra-high resolution chemical mapping.
To analyze the nanoscale chemical distribution of brilliant cresyl blue (BCB)-labeled DNA.

Main Methods:

Developed SERS substrates by evaporating silver layers on Teflon nanospheres.
Employed scanning near-field optical microscopy (SNOM) for near-field SERS measurements.
Utilized brilliant cresyl blue (BCB)-labeled DNA as the sample for nanoscale imaging.

Main Results:

Achieved Raman chemical imaging with a spatial resolution of 100 nm.
Obtained near-field SERS spectra with good signal-to-noise ratios (25:1) within a 60 s exposure time.
Successfully separated reflected laser light from Raman scattered light, allowing correction for topographic coupling.
Observed lateral dependence in Raman signals, indicating specific surface sites with high SERS enhancement.

Conclusions:

The combination of SNOM and SERS enables unprecedented 100 nm scale Raman chemical imaging.
The method allows for precise chemical analysis and mapping at the nanoscale.
This technique is vital for correcting topographic effects in near-field optical imaging and identifying highly sensitive SERS hotspots.