Thermal conductivity of bismuth telluride nanowire array-epoxy composite
Thermal conductivity of bismuth telluride nanowire array-epoxy composite
复制标题
DOI：
10.1063/1.3143221
复制
发表时间：
2009-06-01
影响因子：
4
通讯作者：
Xu, Xianfan
中科院分区：
文献类型：
--
作者：
Biswas, Kalapi G.;Sands, Timothy D.;Xu, Xianfan
在多孔阳极氧化铝（PAA）模板中电沉积纳米线阵列结合了晶体织构控制、声子边界散射抑制晶格热导率、失配应变的弹性松弛以及高效热电器件必不可少的可扩展性所提供的性能优势。然而，模板材料可以作为热分流器，从而降低有效的热电性能。在这里，我们展示了通过用SU-8 （kappa类似于0.2 W/m K）取代PAA矩阵来最小化寄生热传导的过程。我们报告使用光声技术进行热导率测量，将性能损失从Bi2Te3/PAA的27%降低到Bi2Te3/SU-8纳米复合材料的5%。
Electrodeposition of nanowire array in porous anodic alumina (PAA) templates combine the performance benefits offered by crystallographic texture control, lattice thermal conductivity suppression through boundary scattering of phonons, elastic relaxation of misfit strain, and scalablity essential for high efficiency thermoelectric devices. The template material, however, can serve as a thermal shunt thereby reducing the effective thermoelectric performance. Here, we demonstrate a process of minimizing the parasitic thermal conduction by replacing the PAA matrix with SU-8 (kappa similar to 0.2 W/m K). We report a reduction in the performance penalty from 27% for Bi2Te3/PAA to similar to 5% for Bi2Te3/SU-8 nanocomposite by thermal conductivity measurements using a photoacoustic technique.