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Interfacial Molecular Compatibility for Programming Organic-Metal Oxide Superlattices.

Takeshi Ono1, Sae Mitamura1, Takuro Hosomi1,2

  • 1Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.

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|May 25, 2023
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Summary

Designing organic-metal oxide superlattices requires careful control of interfacial molecular compatibility during atomic layer deposition (ALD). Optimized surface chemistry ensures successful multilayer fabrication for advanced material applications.

Keywords:
atomic layer depositionmetal oxide nanowiresorganic−inorganic hybrid materialsself-assembled monolayersuperlattice

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Atomic layer deposition (ALD) enables precise fabrication of multilayered materials.
  • Complex reactions between ALD precursors and organic surfaces hinder organic-metal oxide superlattice formation.
  • Controlling interfacial chemistry is crucial for successful superlattice synthesis.

Purpose of the Study:

  • To investigate the impact of interfacial molecular compatibility on organic-metal oxide superlattice formation via ALD.
  • To identify optimal organic surface chemistries for robust superlattice fabrication.
  • To establish design strategies for predictable superlattice growth.

Main Methods:

  • Utilized scanning transmission electron microscopy (STEM) for structural analysis.
  • Employed in situ quartz crystal microbalance (QCM) for real-time deposition monitoring.
  • Applied Fourier-transform infrared spectroscopy (FTIR) to characterize surface chemistry.
  • Synthesized novel OH-terminated phosphate aliphatic molecules.

Main Results:

  • Interfacial molecular compatibility significantly influences metal oxide layer growth on self-assembled monolayers (SAMs).
  • Optimal SAM terminal groups must react readily with ALD precursors but avoid strong binding to underlying layers.
  • OH-terminated phosphate aliphatic molecules and densely packed, all-trans-like SAMs facilitate successful superlattice formation.
  • Successfully fabricated diverse superlattices using various metal oxides (Al, Hf, Mg, Sn, Ti, Zr oxides).

Conclusions:

  • Molecular design of organic surfaces is critical for controlling ALD processes in superlattice fabrication.
  • Understanding and engineering interfacial reactions enables the rational design of organic-metal oxide heterostructures.
  • This work provides a framework for fabricating complex multilayered materials with tailored properties.