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Layer-by-layer assembly of ordinary and composite coordination multilayers.

Ilanit Doron-Mor1, Hagai Cohen, Sidney R Cohen

  • 1Departments of Materials and Interfaces, Chemical Research Support, and Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 17, 2004
PubMed
Summary

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This study explores metal-organic multilayers built using a layer-by-layer approach. Different metal ion solutions create either true coordination structures or composite organic-ceramic materials with tunable properties.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Coordination Chemistry

Background:

  • Metal-organic multilayers are constructed using layer-by-layer (LbL) assembly.
  • The solution chemistry of metal ions influences multilayer composition and properties.

Purpose of the Study:

  • Investigate the coordination self-assembly of bishydroxamate-based metal-organic multilayers on gold.
  • Determine the impact of metal ion solution chemistry on multilayer structure and properties.

Main Methods:

  • Layer-by-layer (LbL) assembly on gold substrates.
  • Utilizing different metal ion precursors: zirconium(IV) acetylacetonate (Zr(acac)4) and zirconium tetrachloride (ZrCl4).
  • Characterization of multilayer composition, structure, and properties.

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Main Results:

  • Zr(acac)4 solutions yield near-stoichiometric coordination multilayers.
  • ZrCl4 solutions produce thicker composite organic-ceramic multilayers with excess Zr(IV) and zirconia nanophases.
  • Composite multilayers exhibit enhanced dielectric behavior and stiffness compared to stoichiometric ones.
  • Alternate binding of ZrCl4 and Ce4+ further improves mechanical stability.

Conclusions:

  • The choice of metal ion precursor dictates the formation of either coordination or composite organic-ceramic multilayers.
  • LbL assembly offers a route to create nanometer-scale structures with tunable properties.
  • Composite organic-ceramic multilayers present distinct advantages in mechanical and dielectric performance.