Modulation of thermal and thermoelectric transport in individual carbon nanotubes by fullerene encapsulation
Modulation of thermal and thermoelectric transport in individual carbon nanotubes by fullerene encapsulation
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DOI：
10.1038/nmat4946
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发表时间：
2017-09-01
期刊：
影响因子：
41.2
通讯作者：
Goodson, Kenneth E.
中科院分区：
文献类型：
--
作者：
Kodama, Takashi;Ohnishi, Masato;Goodson, Kenneth E.
自 2002 年首次报道电性能的强烈调节以来，封装分子对单个碳纳米管 (CNT) 热性能的潜在影响一直是一个重要的悬而未决的问题(1,2)。然而，由于难以实现碳纳米管封装的分子作为热传输微结构的一部分，热性能调节尚未得到实验证明。在这里，我们开发了一种纳米制造策略，能够测量封装对封装 C-60、Gd@C-82 和 Er-2@C-82 的单个 CNT 束的热导率 (kappa) 和热电势 (S) 的影响。与空心碳纳米管在室温下的性能相比，封装导致 kappa 抑制 35-55%，S 增强约 40%。从 40 K 到 320 K 的温度依赖性测量表明 kappa 峰值向较低温度移动。这些数据与碳纳米管和封装富勒烯之间相互作用的模拟一致。
The potential impact of encapsulated molecules on the thermal properties of individual carbon nanotubes (CNTs) has been an important open question since the first reports of the strong modulation of electrical properties in 2002(1,2). However, thermal property modulation has not been demonstrated experimentally because of the difficulty of realizing CNT-encapsulated molecules as part of thermal transport microstructures. Here we develop a nanofabrication strategy that enables measurement of the impact of encapsulation on the thermal conductivity (kappa) and thermopower (S) of single CNT bundles that encapsulate C-60, Gd@C-82 and Er-2@C-82. Encapsulation causes 35-55% suppression in kappa and approximately 40% enhancement in S compared with the properties of hollow CNTs at room temperature. Measurements of temperature dependence from 40 to 320 K demonstrate a shift of the peak in the kappa to lower temperature. The data are consistent with simulations accounting for the interaction between CNTs and encapsulated fullerenes.