Temperature-Dependent Phonon Conduction and Nanotube Engagement in Metalized Single Wall Carbon Nanotube Films

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• 作者：Matthew A. Panzer ; Hai M. Duong ; Jun Okawa ; Junichiro Shiomi ; Brian L. Wardle ; Shigeo Maruyama ; Kenneth E. Goodson
• 刊名：Nano Letters
• 出版年：2010
• 出版时间：July 14, 2010
• 年：2010
• 卷：10
• 期：7
• 页码：2395-2400
• 全文大小：372K
• 年卷期：v.10,no.7(July 14, 2010)
• ISSN：1530-6992

文摘

Interfaces dominate the thermal resistances in aligned carbon nanotube arrays. This work uses nanosecond thermoreflectance thermometry to separate interface and volume resistances for 10 μm thick aligned SWNT films coated with Al, Ti, Pd, Pt, and Ni. We interpret the data by defining the nanotube-metal engagement factor, which governs the interface resistance and is extracted using the measured film heat capacity. The metal−SWNT and SWNT−substrate resistances range between 3.8 and 9.2 mm²K/W and 33−46 mm²K/W, respectively. The temperature dependency of the heat capacity data, measured between 125 and 300 K, is in good agreement with theoretical predictions. The temperature dependence demonstrated by the metal−SWNT interface resistance data suggests inelastic phonon transmission.

Keywords:

Carbon Nanotube; thermal boundary resistance; phonon; heat capacity