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Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic of the idealized structure for highly anisotropic and efficient heat transport. Perfectly aligned, continuous nanotubes packed in high density completely eliminate the high thermal resistance at nanotube junctions. (b) Schematic drawing of loose nanotube networks as found in bucky paper or chemically spun fibers comprised of short nanotubes. Thermal transport through the network in the direction of the arrow is limited by nanotube bundling, the presence of sidewall defects, and a large number of high thermal resistance nanotube junctions. (c) Photograph of -tall VANTA. (d) Scanning electron micrograph of the top of VANTA.

Image of FIG. 2.
FIG. 2.

(a) Schematics showing the orientation of nanotubes in VANTAs for anisotropy of thermal diffusivity measurements. Thermal diffusivity is calculated from the half rise time of the signal. The anisotropy of thermal diffusivity is defined by the ratio of the longitudinal to transverse diffusivities, and equals 72 for this sample, (VANTA2). (b) Detector response on the backside of the carbon nanotube arrays oriented longitudinally and transversely to the direction of the heat pulse induced. (c) Faster rise time of the detector response for annealed VANTA3, which corresponds to the improved thermal diffusivity of compared to that of for unannealed carbon nanotubes.

Image of FIG. 3.
FIG. 3.

(a) Raman spectra of VANTA4 before and after annealing at were measured with the polarization of the HeNe laser parallel to the orientation of the carbon nanotubes. The ratio of band intensities in the Raman spectrum increases by a factor of 8 as a result of annealing. The inset demonstrates no changes in the RBM region of the Raman spectrum after annealing. (b) HRTEM image of carbon nanotubes in VANTA4 before annealing with sidewall defects. (c) HRTEM image of carbon nanotubes in VANTA4 after annealed showed reduced numbers of sidewall defects.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fast and highly anisotropic thermal transport through vertically aligned carbon nanotube arrays