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Magnetically Actuated Single-Walled Carbon Nanotubes.

Samantha P Roberts1, Arthur W Barnard1, Christopher M Martin1

  • 1†Department of Physics, ‡School of Applied and Engineering Physics, §Laboratory of Atomic and Solid State Physics, and ∥Kavli Institute for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States.

Nano Letters
|July 29, 2015
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Summary

We developed magnetically actuated single-walled carbon nanotube (SWNT) cantilevers. These devices precisely measure SWNT spring constants and enable in situ force measurements with biomolecules and cells.

Keywords:
Single-walled carbon nanotubescarbon nanotube spring constantmagnetic force spectroscopymagnetic tweezers

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biophysics

Background:

  • Single-walled carbon nanotubes (SWNTs) possess unique mechanical properties.
  • Precise characterization of SWNT mechanical behavior is crucial for their application.
  • Developing methods to manipulate and measure forces at the nanoscale is an ongoing challenge.

Purpose of the Study:

  • To create magnetically actuated single-walled carbon nanotube (SWNT) devices.
  • To establish a method for measuring the spring constant of SWNT cantilevers.
  • To provide a platform for in situ measurement of interaction forces involving SWNTs.

Main Methods:

  • Coupling magnetic tweezer techniques with standard lithography.
  • Fabricating parallel arrays of SWNT cantilevers (4-10 μm long).
  • Attaching micron-scale iron magnetic tags to the free ends of SWNT cantilevers for actuation and force application.

Main Results:

  • Direct measurement of SWNT cantilever spring constants in the range of 10(-7)-10(-8) N/m using thermal fluctuations.
  • Demonstration of applying forces and torques to SWNTs via externally applied magnetic field gradients.
  • Successful development of a platform for in situ force measurements.

Conclusions:

  • Magnetically actuated SWNT cantilevers offer a robust platform for nanoscale force measurements.
  • The developed technique allows for precise characterization of SWNT mechanical properties.
  • This method facilitates the study of interactions between SWNTs and other entities like biomolecules and cells.