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Gold Nanocolumnar Templates for Effective Chemical Sensing by Surface-Enhanced Raman Scattering.

Grégory Barbillon1, Christophe Humbert2, María Ujué González3

  • 1EPF-Ecole d'Ingénieurs, 55 Avenue du Président Wilson, 94230 Cachan, France.

Nanomaterials (Basel, Switzerland)
|December 11, 2022
PubMed
Summary

Gold nanocolumns fabricated using glancing angle deposition enable sensitive chemical sensing. This surface-enhanced Raman scattering method achieved low detection limits for thiophenol molecules.

Keywords:
GLADSERSadsorptiongoldplasmonicssensingthiophenol

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Area of Science:

  • Nanotechnology
  • Chemical Sensing
  • Surface Science

Background:

  • Surface-enhanced Raman scattering (SERS) is a powerful technique for chemical detection.
  • Gold nanostructures offer excellent plasmonic properties for SERS applications.
  • Glancing angle deposition (GAD) provides a cost-effective method for fabricating nanocolumnar structures.

Purpose of the Study:

  • To investigate and compare the chemical sensing capabilities of vertical and tilted gold nanocolumnar templates.
  • To evaluate the performance of these templates using thiophenol as a model analyte.
  • To determine the detection limits, enhancement factors, and adsorption quality for SERS applications.

Main Methods:

  • Fabrication of vertical and tilted gold nanocolumnar templates using glancing angle deposition with magnetron sputtering.
  • Utilizing surface-enhanced Raman scattering (SERS) for chemical sensing.
  • Employing thiophenol molecules as model analytes due to their strong adsorption on gold surfaces.

Main Results:

  • Vertical nanocolumnar templates exhibited a detection limit of 10 nM, while tilted templates showed 20 nM.
  • Enhancement factors of 9.8 × 10^8 for vertical and 4.8 × 10^8 for tilted templates were achieved.
  • High-quality adsorption was confirmed with adsorption constants (Kads) of 2.0 × 10^6 M^-1 (vertical) and 1.8 × 10^6 M^-1 (tilted).

Conclusions:

  • Gold nanocolumnar structures fabricated by GAD are effective for sensitive chemical sensing via SERS.
  • The geometry of nanocolumns (vertical vs. tilted) influences sensing performance, with vertical structures showing superior sensitivity.
  • The study demonstrates the potential of these low-cost fabricated nanostructures for detecting trace amounts of analytes.