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Plasmonic Temperature-Programmed Desorption.

Colin J Murphy1,2, Ferry Anggoro Ardy Nugroho2, Hanna Härelind1

  • 1Department of Chemistry and Chemical Engineering and Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.

Nano Letters
|December 18, 2020
PubMed
Summary
This summary is machine-generated.

Plasmonic temperature-programmed desorption (TPD) directly measures molecular coverage on nanoparticles. This new method overcomes limitations of traditional TPD, enabling precise surface science studies.

Keywords:
adsorptionmetalsmoleculesnanoparticlesplasmonic sensingtemperature-programmed desorption

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Area of Science:

  • Surface Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Traditional temperature-programmed desorption (TPD) indirectly measures molecular surface coverage using mass spectrometry.
  • Indirect measurements in TPD can be confounded by signals from unintended surfaces within the vacuum chamber.
  • Accurate determination of molecular bonding strength and coverage is crucial in surface science.

Purpose of the Study:

  • To introduce plasmonic TPD as a direct method for measuring molecular surface coverage on metal nanoparticles.
  • To demonstrate the capability of plasmonic TPD in resolving submonolayer and multilayer adsorption regimes.
  • To showcase the potential of plasmonic TPD for simultaneous analysis of multiple nanoparticle types.

Main Methods:

  • Development and application of plasmonic temperature-programmed desorption (TPD) under ultrahigh vacuum conditions.
  • Utilizing plasmonic properties to directly quantify adsorbed molecular species on metal nanoparticle surfaces.
  • Comparative analysis of methanol and benzene adsorption on gold nanoparticles.

Main Results:

  • Plasmonic TPD directly measures surface coverage, overcoming indirect detection limitations of traditional TPD.
  • The method successfully resolves adsorption features in both submonolayer and multilayer regimes for methanol and benzene on Au nanoparticles.
  • Simultaneous study of molecular adsorption on two different nanoparticle types (Au and Ag) was demonstrated.

Conclusions:

  • Plasmonic TPD offers a direct and accurate alternative to traditional TPD for surface coverage determination.
  • This technique is valuable for studying molecular adsorption phenomena on metal nanoparticles.
  • The ability to analyze multiple nanoparticle types simultaneously opens new avenues in surface science research.