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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Optical Imaging of a Single Molecule with Subnanometer Resolution by Photoinduced Force Microscopy.

Tatsuya Yamamoto1, Hidemasa Yamane2,3, Nobuhiko Yokoshi4

  • 1Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.

ACS Nano
|December 29, 2023
PubMed
Summary

Researchers visualized molecular optical responses using combined microscopy, revealing energy and charge transfer in pentacene bilayers. This breakthrough aids designing molecular functions by understanding nanoscale optical behavior.

Keywords:
KPFMNC-AFMPiFMoptical imagingphotoinduced force microscopysingle molecule

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Area of Science:

  • Molecular nanotechnology
  • Catalysis
  • Biotechnology

Background:

  • Understanding molecular optical response is crucial for advanced applications.
  • Molecular behavior is influenced by electronic states, neighboring molecules, and substrates.
  • Visualizing energy and charge transfer at the nanoscale is challenging.

Purpose of the Study:

  • To visualize the optical response of individual molecules with high spatial resolution.
  • To investigate energy and charge transfer in molecular systems.
  • To develop new microscopy techniques for molecular analysis.

Main Methods:

  • Combined photoinduced force microscopy (PIFM) and Kelvin probe force microscopy (KPFM).
  • Achieved a spatial resolution of 0.6 nm for mapping photoinduced forces.
  • Studied a pentacene bilayer system on an Ag substrate.

Main Results:

  • Successfully mapped photoinduced forces in a pentacene bilayer with nanoscale resolution.
  • Observed "multipole excitation" in the pentacene bilayer.
  • Identified energy and charge transfer between molecules and to the silver substrate.

Conclusions:

  • The combined microscopy approach enables simultaneous visualization of optical response and charge transfer.
  • Findings provide critical insights for designing molecular functions based on layered molecular optical properties.
  • This technique advances the understanding of molecular interactions and energy dynamics.