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Nitrous oxide as an effective AFM tip functionalization: a comparative study.

Taras Chutora1, Bruno de la Torre1,2, Pingo Mutombo2

  • 1Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic.

Beilstein Journal of Nanotechnology
|February 26, 2019
PubMed
Summary
This summary is machine-generated.

Researchers explored using nitrous oxide (N2O) molecules on gold tips for submolecular resolution imaging. While successful, they observed an inherent asymmetry in N2O tip adsorption compared to carbon monoxide (CO) tips.

Keywords:
Au(111)atomic force microscopycarbon monoxidefunctionalizationhigh resolutionnitrous oxidesubmolecular resolution

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Area of Science:

  • Surface Science
  • Scanning Probe Microscopy
  • Computational Chemistry

Background:

  • Atomic Force Microscopy (AFM) enables submolecular imaging using functionalized tips.
  • Carbon Monoxide (CO) functionalized tips are standard for high-resolution AFM.
  • Exploring alternative probe molecules is crucial for advancing AFM capabilities.

Purpose of the Study:

  • To investigate the functionalization of gold tips with nitrous oxide (N2O) molecules.
  • To assess the feasibility of N2O-functionalized tips for submolecular resolution imaging.
  • To compare the adsorption and imaging characteristics of N2O tips with established CO tips.

Main Methods:

  • Atomic Force Microscopy (AFM) with CO-functionalized tips.
  • Density Functional Theory (DFT) simulations.
  • Adsorption studies of N2O on Au(111) surfaces.
  • High-resolution imaging and spectroscopy of FePc molecules using N2O tips.

Main Results:

  • Successful characterization of N2O adsorption on Au(111).
  • Demonstrated feasibility of N2O-functionalized tips for high-resolution imaging.
  • Identified an inherent asymmetry in N2O probe-particle adsorption on the tip apex.
  • DFT calculations confirmed the observed asymmetry for N2O and CO tips.

Conclusions:

  • N2O molecules can functionalize gold tips for submolecular resolution imaging.
  • N2O tips exhibit unique adsorption asymmetry, differing from CO tips.
  • DFT simulations support the experimental findings on tip apex behavior.