Ultralow thermal conductivity of fullerene derivatives
Ultralow thermal conductivity of fullerene derivatives
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DOI：
10.1103/physrevb.88.075310
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发表时间：
2013-08
影响因子：
3.7
通讯作者：
Xiaojian Wang;Christopher D. Liman;N. Treat;M. Chabinyc;D. Cahill
中科院分区：
文献类型：
--
作者：
Xiaojian Wang;Christopher D. Liman;N. Treat;M. Chabinyc;D. Cahill
最近，Dudaet等人[J.C.Duda，P.E.Hopkins，Y.Shen.和M.C.Gupta，Phys.莱特牧师。110,015902(2013)PRLTAO0031-900710.1103/PhysRevLett.110.015902]报道，富勒烯衍生物[6，6]-苯基-C-丁酸甲酯(Λ)在全致密固体Λ≈0.03W MK中具有有史以来最低的导热系数。我们研究了PCBM和与之密切相关的化合物[6，6]-苯基-C-丁酸丁酯(PCBNB)的各种物相和微观结构，发现PCBM和PCBNB薄膜的热导率大多限制在0.05W·Λ<；0.06W·mK范围内，少数样品的Λ略高。我们观察到的电导率比Dudaet等人报道的要大70%，但仍然是“超低”的，因为热导率是通过估计每个分子的热激发模预测的最小热导率模型预测的电导率的一个≈3倍。
Recently, Dudaet al.[J. C. Duda, P. E. Hopkins, Y. Shen, and M. C. Gupta, Phys. Rev. Lett. 110, 015902 (2013)PRLTAO0031-900710.1103/PhysRevLett.110.015902] reported that the fullerene derivative [6,6]-phenyl-C-butyric acid methyl ester (PCBM) has the lowest thermal conductivity Λ ever observed in a fully dense solid, Λ ≈ 0.03 W mK. We have investigated a variety of phases and microstructures of PCBM and the closely related compound [6,6]-phenyl-C-butyric acid n-butyl ester (PCBNB) and find that the thermal conductivities of PCBM and PCBNB films are mostly limited to the range 0.05 < Λ < 0.06 W mKwith a few samples having slightly higher Λ. The conductivities we observe are ≈70larger than reported by Dudaet al.but are still “ultralow” in the sense that the thermal conductivity is a factor of ≈3 below the conductivity predicted by the minimum thermal conductivity model using an estimate of the thermally excited modes per molecule.