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Subnanometer-Diameter Wires Isolated in a Polymer Matrix by Fast Polymerization

Golden¹, DiSalvo, Frechet

¹J. H. Golden, F. J. DiSalvo, J. M. J. Frechet, Department of Chemistry, Cornell University, Baker Laboratory, Ithaca, NY 14853, USA. J. Silcox and M. Thomas, Cornell University Materials Science Center, Clark Hall, Ithaca, NY 14853, USA. J. Elman, Eastman Kodak Company, Rochester, NY 14650, USA.

Science (New York, N.Y.)

|August 9, 1996

Summary

Researchers created novel inorganic-organic polymer nanocomposites using inorganic nanowires and polymer hosts. These materials, including oriented multiwire cables, exhibit optical anisotropy and electrical conductivity.

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Area of Science:

Materials Science
Nanotechnology
Polymer Chemistry

Background:

Inorganic-organic polymer nanocomposites offer unique properties by combining diverse material components.
Controlling the nanoscale architecture of inorganic components within a polymer matrix is challenging.
Achieving homogeneous dispersion and preventing phase separation are critical for material performance.

Purpose of the Study:

To develop a method for preparing inorganic-organic polymer nanocomposites with controlled nanostructures.
To investigate the formation of inorganic nanowires and multiwire cables within a polymer matrix.
To characterize the properties of the resulting nanocomposites, focusing on optical and electrical behavior.

Main Methods:

Dissolving inorganic (LiMo3Se3)n wires in a coordinating monomer (vinylene carbonate).
Employing rapid polymerization with a cross-linking agent to prevent phase separation.
Varying solution concentration to control the formation of mono/biwires versus oriented multiwire cables.
Characterizing the nanocomposites using techniques to assess structure, optical anisotropy, and electrical conductivity.

Main Results:

Successful preparation of inorganic-organic polymer nanocomposites without phase separation.
Dilute solution polymerization yielded (Mo3Se3(-))n mono- and biwires (6-20 Å diameter, 50-100 nm length).
Concentrated liquid crystalline solution polymerization produced oriented multiwire cables (20-40 Å diameter, up to 1500 nm length).
The oriented multiwire cables exhibited optical anisotropy and electrical conductivity.

Conclusions:

A robust method for creating inorganic-organic polymer nanocomposites with tunable nanostructures was established.
The concentration-dependent polymerization strategy allows for control over the morphology of inorganic components.
The resulting nanocomposites, particularly those with oriented multiwire cables, demonstrate promising functional properties for electronic and optical applications.