Fabrication, Structure and Properties of a Single Carbon Nanotube-Based Nano-Electromechanical System Public Deposited

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  • March 19, 2019
  • Lin, Letian
    • Affiliation: College of Arts and Sciences, Department of Applied Physical Sciences
  • The research work evolved in this dissertation presents (i) a foundational study on the atomic structure, transport property, electromechanical actuation, and inter-shell friction of carbon nanotubes using a nano-electromechanical system based on a single carbon nanotube and (ii) a fabrication technique of the nano-electromechanical system which provides a versatile platform for studies on one-dimensional nano-materials such as nanowires or other types of nanotubes. The geometry of having a free suspended carbon nanotube makes the device capable of in situ electromechanical manipulation and electrical resistance measurement on a single nanotube in a transmission electron microscope. The fabrication and the operation of the device are first described in detail. Experimental results are then presented to report the electrical and mechanical properties of single nanotubes and corresponding device characterization. First, chiral indices of a nanotube and its corresponding electrical resistance at room temperature are measured. A physical model based on the band gap theory is established to correlate the electrical resistivity with the atomic structure of the carbon nanotube. Second, I present a direct measurement of the torsional motion of both shells of a double wall carbon nanotube under an external torque on the outer shell. The measurement is performed by actuating a metal paddle attached to the outer shell of the nanotube while the stains of the nanotube are derived from its electron diffraction patterns. The inner shell is found to twist along with the outer shell with no stiction. The inter-shell friction, both static and kinetic, is inferred from direct measurements of each shell's deformation, van der Waals interactions between the two shells, and a tested model of lattice strain. Finally, the handedness of carbon nanotubes is determined using the same device. The implications are also discussed for potential applications and as directions of future research.
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  • In Copyright
  • Qin, Lu-Chang
  • Doctor of Philosophy
Graduation year
  • 2011

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