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Nanocomposite microstructures with tunable mechanical and chemical properties.

Sameh Tawfick1, Xiaopei Deng, A John Hart

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.

Physical Chemistry Chemical Physics : PCCP
|April 22, 2010
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Summary

A novel two-step chemical vapor deposition (CVD) method creates polymer-coated carbon nanotube (CNT) microstructures. This technique allows tunable mechanical properties and accessible chemical functionality for advanced materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Carbon nanotubes (CNTs) offer unique mechanical and electrical properties but often require functionalization for specific applications.
  • Hierarchical microstructures with tunable properties are crucial for advanced material design.
  • Controlling mechanical properties and chemical accessibility of CNT-based materials remains a challenge.

Purpose of the Study:

  • To develop a versatile two-step chemical vapor deposition (CVD) method for fabricating polymer-coated CNT microstructures.
  • To achieve tunable mechanical properties and accessible chemical functionality in these nanocomposite materials.
  • To explore the potential of these materials as tunable platforms for sensing applications.

Main Methods:

  • Vertically aligned CNTs of diverse geometries were grown using lithographically patterned catalyst films.
  • CNTs were functionalized with poly[4-trifluoroacetyl-p-xylylene-co-p-xylylene] via CVD polymerization.
  • Mechanical properties were tuned by adjusting polymer deposition times, and chemical structure was verified using XPS and FTIR.

Main Results:

  • The polymer coating conformed to individual CNTs and bundles within the CNT "forest".
  • Increasing polymer film thickness from 10 nm to 27 nm enhanced Young's modulus from 65 MPa to 80 MPa, compared to 36 MPa for uncoated CNTs.
  • A 4-fold fluorescence enhancement was observed after dye binding, indicating accessible chemical functionality.

Conclusions:

  • The developed CVD method successfully fabricates hierarchical polymer-coated CNT microstructures with tunable mechanical properties.
  • The polymer coating reinforces CNT connectivity and enhances mechanical strength.
  • This technique provides a tunable platform for integrating mechanical and chemical responses, suitable for environmental and biological sensing.