Carbon nanotube (CNT) arrays can be effective thermal interface materials with high compliance and conductance over a wide temperature range. Here, we study CNT interface structures in which free CNT ends are bonded using Pd hexadecanethiolate, Pd(SC16H35)2, to an opposing substrate (one-sided interface) or opposing CNT array (two-sided interface) to enhance contact conductance while maintaining a compliant joint. The Pd weld is particularly attractive for its mechanical stability at high temperatures. A transient photoacoustic (PA) method is used to measure the thermal resistance of the palladium-bonded CNT interfaces. The interfaces were bonded at moderate pressures and then tested at 34 kPa using the PA technique. At an interface temperature of approximately 250°C, one-sided and two-sided palladium-bonded interfaces achieved thermal resistances near 10 mm2 K/W and 5 mm2 K/W, respectively.
Palladium Thiolate Bonding of Carbon Nanotube Thermal Interfaces
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Hodson, S. L., Bhuvana, T., Cola, B. A., Xu, X., Kulkarni, G. U., and Fisher, T. S. (June 23, 2011). "Palladium Thiolate Bonding of Carbon Nanotube Thermal Interfaces." ASME. J. Electron. Packag. June 2011; 133(2): 020907. https://doi.org/10.1115/1.4004094
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