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Updated: Dec 31, 2025

Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Layered material platform for surface plasmon resonance biosensing.

F Wu1,2,3, P A Thomas1, V G Kravets1

  • 1School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK.

Scientific Reports
|January 1, 2020
PubMed
Summary
This summary is machine-generated.

Graphene and layered materials enhance plasmonic biosensing by protecting metal films from corrosion and preserving resonance quality. This boosts sensitivity by 3-4 orders of magnitude for detecting molecules like HT-2 toxins.

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Materials Science

Background:

  • Plasmonic biosensing offers sensitive, label-free detection for various applications, including drug discovery and food safety.
  • The technique relies on surface plasmon resonances in metallic films, but metal corrosion in bio-solutions and surface functionalization can reduce sensitivity.
  • Existing limitations hinder the widespread application and sensitivity of current plasmonic biosensing platforms.

Purpose of the Study:

  • To develop a novel approach to enhance the sensitivity and stability of plasmonic biosensing.
  • To overcome the limitations posed by metal corrosion and surface functionalization in bio-solutions.
  • To demonstrate a new platform for highly sensitive detection of low molecular weight toxins.

Main Methods:

  • Utilized graphene and other layered materials for passivation and functionalization of metallic films in plasmonic biosensors.
  • Investigated the stability of metal surfaces and the preservation of plasmonic resonance quality under biofunctionalization.
  • Applied the developed approach to detect low molecular weight HT-2 toxins.

Main Results:

  • Graphene and layered materials significantly increased the stability of metals in bio-solutions, preserving plasmonic resonance quality.
  • Achieved a 3-4 orders of magnitude increase in sensitivity for plasmonic biosensing.
  • Demonstrated highly sensitive detection of HT-2 toxins with a phase sensitivity of approximately 0.5 fg/mL.

Conclusions:

  • Layered materials provide a robust platform for plasmonic biosensing, enabling the use of a broader range of metals.
  • The enhanced sensitivity and stability pave the way for the development of compact, point-of-care biosensors.
  • This breakthrough has significant implications for food safety, diagnostics, and bio-reaction studies.