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Template-stripped substrates with solvent-impermeable metal thin films.

Cynthia Avedian1, Christina D M Trang1, Michael S Inkpen1

  • 1Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.

ACS Nanoscience Au
|August 27, 2025
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Summary

Template-stripped gold substrates are now usable in organic solvents using a protective flow cell. This innovation expands their application for studying molecular behavior at the metal-solution interface.

Keywords:
electrochemistrygold thin filmsself-assembled monolayerstemplate-strippingthree-dimensional printing

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Materials Science

Background:

  • Template-stripped substrates offer clean, ultraflat gold surfaces, eliminating the need for extensive cleaning or costly single-crystal electrodes.
  • Current methods using adhesives for these substrates are unstable in organic solvents, limiting their use.
  • Developing robust methods for using these substrates in diverse chemical environments is crucial.

Purpose of the Study:

  • To enhance the stability and applicability of template-stripped gold substrates in organic solvents.
  • To demonstrate a protective flow cell system for overcoming solvent-induced instabilities.
  • To validate the extended utility of these substrates for molecular studies.

Main Methods:

  • Integration of template-stripped substrates with solvent-impermeable metal films into a custom-built electrochemical flow cell.
  • Application of the protected substrates in organic solvent environments.
  • Electrochemical analysis of self-assembled monolayers (SAMs) including alkanethiols and ferrocenyl-hexanethiol.

Main Results:

  • Demonstrated successful use of template-stripped gold substrates in organic solvents via the flow cell.
  • Observed reproducible reductive desorption features for alkanethiols.
  • Characterized redox response of 6-(ferrocenyl)-hexanethiol and confirmed low coverage of cobalt-(II) bis-(terpyridine) assemblies.

Conclusions:

  • The developed flow cell methodology significantly extends the utility of template-stripped gold substrates.
  • These substrates are now viable for studying adsorbed molecules in challenging chemical environments.
  • This approach enhances the understanding of nanoscopic metal-solution interface properties.