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Hierarchical Laser-Patterned Silver/Graphene Oxide Hybrid SERS Sensor for Explosive Detection.

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|November 5, 2019
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Summary

We developed a novel ultrafast laser-ablated silver nanoparticle/graphene oxide hybrid substrate for highly sensitive detection of the explosive marker 2,4-dinitrotoluene (2,4-DNT). This new surface-enhanced Raman scattering (SERS) sensor achieves picomolar sensitivity and a Raman enhancement of 10^10.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Surface-enhanced Raman scattering (SERS) is a powerful technique for trace molecule detection.
  • Developing sensitive and reproducible SERS substrates is crucial for detecting explosive markers.
  • Graphene oxide (GO) and silver nanoparticles (AgNPs) are promising materials for SERS applications.

Purpose of the Study:

  • To demonstrate an ultrafast laser-ablated hierarchically patterned silver nanoparticle/graphene oxide (AgNP/GO) hybrid SERS substrate.
  • To achieve highly sensitive and reproducible detection of the explosive marker 2,4-dinitrotoluene (2,4-DNT).
  • To investigate the effect of laser ablation parameters on substrate morphology and SERS performance.

Main Methods:

  • Hierarchical laser patterning of silver sheets using ultrafast laser ablation in air.
  • Deposition of silver nanoparticles (AgNPs) onto laser-patterned silver sheets.
  • Spin-coating of graphene oxide (GO) onto the AgNP-decorated surface.
  • Characterization using FESEM, HRTEM, XRD, FTIR, and Raman spectroscopy.
  • SERS measurements for 2,4-dinitrotoluene detection.

Main Results:

  • A rapid increase in ablation rate with increasing laser energy was observed.
  • The hierarchical AgNP/GO hybrid structure exhibited excellent SERS activity.
  • High sensitivity for 2,4-DNT detection was achieved, down to the picomolar (pM) concentration range.
  • A significant Raman intensity enhancement of approximately 10^10 was realized for 2,4-DNT.
  • The substrate demonstrated good stability and reproducibility.

Conclusions:

  • Ultrafast laser ablation is an effective method for creating hierarchical AgNP/GO hybrid SERS substrates.
  • The developed substrate offers high sensitivity and selectivity for detecting 2,4-DNT.
  • The synergistic effect of GO and AgNPs contributes to the enhanced SERS performance.
  • This technology holds potential for explosive detection and other sensing applications.