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Imaging molecular structures and interactions by enhanced confinement effect in electron microscopy.

Mengmeng Ma1,2, Qinnan Yu1,2, Jiayi Zhang1,2

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Stable atomic imaging of molecules is achieved using confinement and low-dose electron microscopy. Stronger host-guest interactions improve molecular image clarity and enable study of molecular behaviors.

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Atomic imaging of molecules and their interactions is crucial for understanding fundamental physics and chemistry.
  • Challenges in electron microscopy include molecular thermal mobility and beam sensitivity.

Purpose of the Study:

  • To propose a general strategy for imaging confined molecules using low-dose electron microscopy.
  • To evaluate host-guest interaction strengths in various material systems.
  • To analyze the influence of interaction strength on molecular imaging quality.

Main Methods:

  • Utilizing confinement effects and low-dose imaging techniques in electron microscopy.
  • Investigating three material systems: perovskites, zeolites, and metal-organic frameworks.
  • Analyzing molecular projections using aspect ratios to correlate with interaction strengths.

Main Results:

  • Clear images of molecular configurations were obtained in perovskite (ionic) and zeolite (van der Waals) systems by enhancing host-guest interactions.
  • Atomic structures and bonds of aromatics were resolved in metal-organic frameworks (coordination) systems.
  • A relationship between molecular image quality and host-guest interaction strength was established.

Conclusions:

  • Low-dose electron microscopy with confinement offers a viable strategy for high-resolution molecular imaging.
  • Host-guest interaction strength significantly impacts the clarity and detail of atomic-scale molecular images.
  • This approach enables the study of diverse molecular behaviors in real space across various applications.