Photoacoustic characterization of carbon nanotube array thermal interfaces
نویسندگان
چکیده
This work describes an experimental study of thermal conductance across multiwalled carbon nanotube CNT array interfaces, one sided Si-CNT-Ag and two sided Si-CNT-CNT-Cu , using a photoacoustic technique PA . Well-anchored, dense, and vertically oriented multiwalled CNT arrays have been directly synthesized on Si wafers and pure Cu sheets using plasma-enhanced chemical vapor deposition. With the PA technique, the small interface resistances of the highly conductive CNT interfaces can be measured with accuracy and precision. In addition, the PA technique can resolve the one-sided CNT interface component resistances Si-CNT and CNT-Ag and the two-sided CNT interface component resistances Si-CNT, CNT-CNT, and CNT-Cu and can estimate the thermal diffusivity of the CNT layers. The thermal contact resistances of the oneand two-sided CNT interfaces measured using the PA technique are 15.8±0.9 and 4.0±0.4 mm2 K/W, respectively, at moderate pressure. These results compare favorably with those obtained using a steady state, one-dimensional reference bar method; however, the uncertainty range is much narrower. The one-sided CNT thermal interface resistance is dominated by the resistance between the free CNT array tips and their opposing substrate CNT-Ag , which is measured to be 14.0±0.9 mm2 K/W. The two-sided CNT thermal interface resistance is dominated by the resistance between the free tips of the mating CNT arrays CNT-CNT , which is estimated to be 2.1±0.4 mm2 K/W. © 2007 American Institute of Physics. DOI: 10.1063/1.2510998
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