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The electronic properties of multi-walled carbon nanotubes

Authors
Publisher
Purdue University
Publication Date
Keywords
  • Engineering
  • Electronics And Electrical|Physics
  • Condensed Matter

Abstract

Many of the physical and electronic properties of multi-walled carbon nanotubes are not well understood. Theoretical considerations of their electronic properties predict behavior characteristic of low-dimensional structures, such as the quantization of energy levels and strong electron-electron interactions. Using energy-resolved field emission, we obtained electron energy distributions from multi-walled carbon nanotubes. The measured energy distributions indicate complex yet discrete energy levels in multi-walled carbon nanotubes. In addition, the emission current is found to fluctuate in time. ^ To determine the source of the field emission current fluctuations and to study the fundamental electronic properties of multi-walled carbon nanotubes, we performed electronic transport measurements. For these measurements, we developed a technique for contacting the nanotubes. Measurements of the conductance at room temperature on the resulting samples displays a large amount of noise, indicating that the current fluctuations are intrinsic to multi-walled nanotubes. Low temperature conductance measurements provide evidence of a non-Fermi electron behavior known as a Luttinger liquid. The measured conductance contains contributions from the nanotube-contact interface and from the nanotube itself. ^

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