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Related Experiment Videos

Electrowetting in carbon nanotubes.

J Y Chen1, A Kutana, C P Collier

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|December 3, 2005
PubMed
Summary
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Researchers show how to reversibly fill carbon nanotubes with mercury using electrocapillary pressure. This process enhances nanotube conductance by reducing contact resistance and forming mercury nanowires.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Single-wall carbon nanotubes (SWCNTs) are crucial in nanoelectronics due to their unique electrical properties.
  • Controlling the interaction between nanotubes and liquids is essential for developing novel nanotube-based devices.
  • Mercury's high surface tension and conductivity present unique challenges and opportunities for nanotube filling.

Purpose of the Study:

  • To demonstrate the reversible wetting and filling of open SWCNTs with mercury.
  • To investigate the role of electrocapillary pressure in driving the filling process.
  • To assess the impact of mercury filling on the electrical conductance of SWCNTs.

Main Methods:

  • Applying an electrical potential across individual SWCNTs in contact with a mercury drop to induce electrocapillary pressure.

Related Experiment Videos

  • Measuring changes in electrical conductance of the SWCNTs before and after mercury interaction.
  • Utilizing molecular dynamics simulations to model and corroborate the electrocapillarity-driven filling mechanism.

    • Main Results:

    • Achieved reversible wetting and filling of SWCNTs with mercury.
    • Observed significant improvement in electrical conductance for both metallic and semiconducting SWCNT probes.
    • Demonstrated that mercury filling decreases contact resistance and forms an internal mercury nanowire.
    • Molecular dynamics simulations confirmed the electrocapillarity-driven process and provided quantitative estimates for filling speed and pressure.

    Conclusions:

    • Electrocapillary pressure is an effective method for controlling mercury wetting and filling in SWCNTs.
    • Mercury-filled SWCNTs exhibit enhanced electrical conductance, opening possibilities for nanoelectronic applications.
    • The demonstrated technique offers a pathway for fabricating functional nanotube-based components.