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Surface Molecular Patterning by Plasmon-Catalyzed Reactions.

Zhiyang Zhang1,2, Janina Kneipp1,2

  • 1Department of Chemistry and School of Analytical Sciences Adlershof (SALSA), Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.

ACS Applied Materials & Interfaces
|September 2, 2021
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate rewritable molecular patterns on plasmonic substrates using localized surface plasmon resonances (LSPRs). This enables novel applications in surface-enhanced Raman scattering (SERS) for security labels and biosensing arrays.

Keywords:
4,4′-dimercaptoazobenzenep-aminothiophenolp-nitrothiophenolplasmon-catalyzed reactionssurface molecular patterning

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Area of Science:

  • Plasmonics and Nanotechnology
  • Surface Chemistry and Materials Science
  • Spectroscopy and Sensing

Background:

  • Self-assembled monolayers (SAMs) on plasmonic substrates are crucial for surface-enhanced Raman scattering (SERS).
  • Localized surface plasmon resonances (LSPRs) facilitate plasmon-supported chemical modifications.
  • Existing methods lack dynamic control over molecular functionalization on plasmonic surfaces.

Purpose of the Study:

  • To demonstrate micropatterning of SAMs on gold nanosubstrates using plasmon-catalyzed reactions.
  • To explore rewritable SERS-based security labels and sensing arrays.
  • To investigate the use of LSPRs for controlled chemical modifications and pattern generation.

Main Methods:

  • Micropatterning of self-assembled monolayers (SAMs) on gold nanosubstrates.
  • Utilizing plasmon-catalyzed reactions, including DMAB formation from PATP/PNTP and PNTP reduction to PATP.
  • Employing high-intensity visible laser illumination focused via a microscope objective to initiate localized reactions.

Main Results:

  • Successful generation of microscopic molecular patterns through plasmon-catalyzed derivatization of SAMs.
  • Demonstration of rewritable patterns by erasing and rewriting molecular functionalities on demand.
  • Formation of 4,4'-dimercaptoazobenzene (DMAB) and reduction of p-nitrothiophenol (PNTP) to p-aminothiophenol (PATP) in specific locations.

Conclusions:

  • LSPR-mediated micropatterning offers a versatile platform for dynamic functionalization of plasmonic substrates.
  • The developed technique enables rewritable SERS security labels and functionalized sensing arrays.
  • This approach provides strategies for encryption and stepwise functionalization with potential in advanced materials.