skip to main content

Title: Thermal conductivity of vertically aligned carbon nanotube arrays: Growth conditions and tube inhomogeneity

The thermal conductivity of vertically aligned carbon nanotube arrays (VACNTAs) grown on silicon dioxide substrates via chemical vapor deposition is measured using a 3ω technique. For each sample, the VACNTA layer and substrate are pressed to a heating line at varying pressures to extract the sample's thermophysical properties. The nanotubes' structure is observed via transmission electron microscopy and Raman spectroscopy. The presence of hydrogen and water vapor in the fabrication process is tuned to observe the effect on measured thermal properties. The presence of iron catalyst particles within the individual nanotubes prevents the array from achieving the overall thermal conductivity anticipated based on reported measurements of individual nanotubes and the packing density.
Authors:
; ; ;  [1]
  1. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904-4746 (United States)
Publication Date:
OSTI Identifier:
22350893
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON NANOTUBES; CATALYSTS; CHEMICAL VAPOR DEPOSITION; CRYSTAL GROWTH; DENSITY; HYDROGEN; IRON; LAYERS; PRESSES; RAMAN SPECTROSCOPY; SILICON OXIDES; SUBSTRATES; THERMAL CONDUCTIVITY; TRANSMISSION ELECTRON MICROSCOPY; WATER VAPOR