Abstract
Among the exceptional properties of isolated individual carbon nanotubes (CNTs), exceptional thermal conductivity along their axis has been demonstrated, However they have also shown poor thermal transfer between adjacent CNTs. Thick bundles of aligned CNTs have been used as heat pipes, but the thermal input and output power densities are the same, providing no heat spreading effect. We demonstrate the use of energetic argon ion beams to join overlapping CNTs in a thin film to form an interpenetrating network with an isotropic thermal conductivity of 2150 W/m K. Such thin films may be used as heat spreaders to enlarge the thermal footprint of laser diodes and CPU chips, for example, for enhanced cooling. At higher ion energies and fluence, the CNTs appear to collapse and reform, aligned parallel to the ion beam axis, and form dense high aspect ratio tapered structures. The high surface area of these structures lends themselves to applications in energy storage, for example. We consider the mechanisms of energetic ion interaction with CNTs and junction formation of two overlapping CNTs during the subsequent self-healing process, as well as the formation of high aspect ratio structures under more extreme conditions
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Acknowledgment
The author is grateful to Dr. Vladimir Samuilov of the Department of Materials Science and Engineering, SUNY at Stony Brook, NY for his assistance in performing the thermal conductivity measurements, and also to the Center for Functional Nanomaterials of Brookhaven National Lab, Upton, NY for their assistance in preparing and analyzing CNT films under DOE contract DE-AC02-98CH10886. Funding for this project was provided by the author.
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Konesky, G.A. Cross-Linked Carbon Nanotube Heat Spreader. MRS Online Proceedings Library 1752, 131–136 (2015). https://doi.org/10.1557/opl.2014.930
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DOI: https://doi.org/10.1557/opl.2014.930