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Author Spotlight: Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
Published on: July 21, 2023
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Hierarchic Interfacial Nanocube Assembly for Sensitive, Selective, and Quantitative DNA Detection with
Minho Kim1, Sung Min Ko1, Chungyeon Lee1
1Department of Chemistry , Seoul National University , Seoul 08826 , South Korea.
Analytical Chemistry
|July 3, 2019
Summary
A new hierarchic-nanocube-assembly based SERS (H-Cube-SERS) bioassay enables stable and reproducible DNA detection. Uniform gold nanocubes offer superior performance for sensitive, quantitative biodetection on surface-enhanced Raman scattering platforms.
Area of Science:
- Nanotechnology
- Biotechnology
- Analytical Chemistry
Background:
- Surface-enhanced Raman scattering (SERS) offers sensitive, selective, and multiplexed detection but faces challenges in controlled particle assembly and signal quantification.
- Variability in signal enhancement across particles limits the reliability of SERS for practical biodetection.
- Existing SERS platforms struggle with reproducibility and quantitative analysis due to uncontrolled plasmonic particle arrangements.
Purpose of the Study:
- To develop a hierarchic-nanocube-assembly based SERS (H-Cube-SERS) bioassay for controlled electromagnetic field amplification.
- To achieve stable, reproducible, and quantitative DNA detection using gold nanocubes (AuNCs).
- To compare the performance of uniformly surfaced AuNCs with spherical Au nanoparticles for SERS biodetection.
Main Methods:
- Fabrication of a hierarchic-nanocube-assembly structure for SERS.
- Development of an H-Cube-SERS bioassay for DNA detection.
- Comparative analysis of gold nanocubes versus spherical gold nanoparticles in SERS assays.
Main Results:
- The H-Cube-SERS assay demonstrated stable and reproducible detection of target DNA across a wide dynamic range (100 aM to 10 pM).
- Uniformly surfaced AuNCs exhibited superior performance compared to spherical Au nanoparticles, showing faster DNA binding kinetics and sharper melting transitions.
- AuNCs provided wider hot spot regions and reduced dependence on light polarization, enhancing SERS signal reliability and quantification.
Conclusions:
- The developed H-Cube-SERS strategy enables controllable electromagnetic field amplification for enhanced biodetection.
- Uniform gold nanocubes are highly suitable for sensitive, reliable, and quantitative SERS biodetection assays.
- This work advances quantitative SERS biodetection and offers potential for other particle assembly systems.
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