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Surface Enhanced Raman Spectroscopy With Electrodeposited Copper Ultramicro-Wires With/Without Silver Nanostars

Margherita Longoni1,2, Maria Sole Zalaffi1, Lavinia de Ferri3,4

  • 1Department of Molecular Sciences and Nanosystems, University Ca' Foscari of Venice, via Torino 155, 30172 Venice, Italy.

Nanomaterials (Basel, Switzerland)
|March 6, 2021
PubMed
Summary

Researchers revisited copper ultramicrowire (CuUW) preparation for cost-effective surface-enhanced Raman spectroscopy (SERS) substrates. Optimized electrodeposition yielded CuUWs with 10^3-10^4 enhancement, further improved by silver nanostar decoration.

Keywords:
SERSanodized aluminum oxidebenzenethiolcopperelectrochemical depositionsilver nanostarstemplatetrack-etched polycarbonateultramicrowire

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Spectroscopy

Background:

  • Surface-enhanced Raman spectroscopy (SERS) requires efficient substrates.
  • Copper ultramicrowires (CuUWs) offer potential as SERS substrates.
  • Template-assisted electrochemical deposition is a method for creating nanostructures.

Purpose of the Study:

  • To critically revisit the electrochemical preparation of CuUW arrays using porous membranes.
  • To optimize deposition parameters for cost-effective and efficient SERS substrates.
  • To investigate the influence of template and electrode materials on CuUW formation and SERS performance.

Main Methods:

  • Electrochemical deposition of copper onto porous templates (anodized aluminum oxide and track-etched polycarbonate).
  • Voltammetric and potentiostatic studies for parameter optimization.
  • Chemical etching to remove templates and obtain CuUW arrays.
  • SERS measurements using benzenethiol as a probe molecule.

Main Results:

  • Optimized electrodeposition parameters yielded uniform CuUW arrays.
  • CuUW substrates demonstrated SERS enhancement factors in the range of 10^3-10^4.
  • Decoration with silver nanostars significantly enhanced SERS activity by forming bimetallic hot-spots.

Conclusions:

  • Electrochemical preparation of CuUWs using porous templates is a viable route for SERS substrates.
  • The choice of template and electrode material influences CuUW morphology and SERS performance.
  • Silver nanostar decoration provides a pathway to achieve higher Raman enhancement for SERS applications.