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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

332
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
332
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
373

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Updated: Jun 28, 2025

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Surface-Enhanced Raman Scattering Sensors Employing a Nanoparticle-On-Liquid-Mirror (NPoLM) Architecture.

Shreyan Datta1, Shoaib Vasini1, Xianglong Miao1

  • 1Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA.

Small Methods
|April 19, 2024
PubMed
Summary

A novel nanoparticle-on-liquid-mirror (NPoLM) architecture enhances Surface-Enhanced Raman Scattering (SERS) sensors. This design overcomes analyte delivery challenges, achieving significantly higher SERS signals.

Keywords:
liquid metalnanophotonicsplasmonicssensingsurface‐enhanced Raman scattering

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Chemical Sensing

Background:

  • Surface-enhanced Raman scattering (SERS) sensors rely on nanophotonic structures for signal amplification.
  • Achieving high SERS enhancement typically requires nanoscale hotspots for field confinement.
  • A key challenge is efficiently delivering analytes into these nanometric hotspots, limiting sensor performance.

Purpose of the Study:

  • To develop a new SERS sensor architecture that resolves the trade-off between hotspot confinement and analyte delivery.
  • To demonstrate a cost-effective and reliable method for fabricating the proposed SERS sensor.

Main Methods:

  • Fabrication of gold nanoparticles on a suitable substrate.
  • Formation of nanoparticle-on-liquid-mirror (NPoLM) structures using solid gold nanoparticles and bulk liquid metal.
  • Characterization of SERS performance using the NPoLM architecture.

Main Results:

  • The NPoLM architecture effectively forms nanophotonic resonators with nanometric hotspots.
  • Analyte molecules are efficiently delivered to the nanoparticle surface before hotspot formation.
  • NPoLM structures achieved two orders of magnitude higher SERS signals compared to gold nanoparticles alone.

Conclusions:

  • The NPoLM architecture offers a promising solution for overcoming analyte delivery limitations in SERS sensors.
  • This approach enables convenient formation of nanometric hotspots with enhanced SERS performance.
  • The developed fabrication process is cost-effective and reliable for NPoLM SERS sensors.