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Related Concept Videos

Raman Spectroscopy: Overview01:20

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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.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Related Experiment Video

Updated: Apr 2, 2026

Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Ag@Au core-shell dendrites: a stable, reusable and sensitive surface enhanced Raman scattering substrate.

Hong Jun Yin1, Zhao Yang Chen1, Yong Mei Zhao2

  • 1Beijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology, Beijing, 100029, China.

Scientific Reports
|September 29, 2015
PubMed
Summary

This study presents a novel silver-gold (Ag@Au) core-shell dendrite substrate for surface-enhanced Raman scattering (SERS). The durable and reusable SERS substrate demonstrates high sensitivity for detecting heavy metal ions, saving resources.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Analytical Chemistry

Background:

  • Surface-enhanced Raman scattering (SERS) requires robust and reusable substrates.
  • Developing stable core-shell nanostructures is crucial for advanced SERS applications.
  • Silver dendrites are effective SERS substrates but often lack long-term stability.

Purpose of the Study:

  • To fabricate and characterize a novel Ag@Au core-shell dendrite SERS substrate.
  • To evaluate the stability, reusability, and sensitivity of the new SERS substrate.
  • To explore the substrate's potential for detecting heavy metal ions.

Main Methods:

  • Ag dendrites were synthesized on a Si wafer via hydrothermal corrosion.
  • A gold (Au) nanofilm was deposited onto Ag dendrites using chemical reduction.
  • SERS performance was tested using various analytes, including thiophene, adenine, and Cd(2+).
  • Stability and reusability were assessed over multiple cycles and a six-month period.
  • Finite-difference time-domain (FDTD) simulations were performed to analyze electromagnetic field enhancement.

Main Results:

  • The Ag@Au core-shell dendrite substrate exhibited excellent SERS performance.
  • The substrate demonstrated high stability and reusability over four cycles without performance degradation.
  • Six-month stability tests confirmed superior durability compared to Ag dendrite substrates.
  • Fast detection of Cd(2+) at 10(-8) M concentration was achieved using DNA functionalization.
  • FDTD simulations indicated that a 4 nm Au layer minimally impacts the local electric field and enhancement factor.

Conclusions:

  • The fabricated Ag@Au core-shell dendrite is a highly stable, reusable, and sensitive SERS substrate.
  • This novel substrate holds significant promise for resource-efficient SERS applications.
  • The substrate's stability and sensitivity enable sensitive detection of environmental pollutants like Cd(2+).