Light-Weight Flexible Carbon Nanotube Based Organic Composites with Large Thermoelectric Power Factors
Light-Weight Flexible Carbon Nanotube Based Organic Composites with Large Thermoelectric Power Factors
复制标题
DOI：
10.1021/nn202868a
复制
发表时间：
2011-10-01
期刊：
影响因子：
17.1
通讯作者：
Grunlan, Jaime C.
中科院分区：
文献类型：
--
作者：
Yu, Choongho;Choi, Kyungwho;Grunlan, Jaime C.
典型的有机材料具有最适合于热电的低热导率，但是它们具有强烈的不利相关性的不良电性能使它们成为可行的候选物。我们的复合材料，含有单壁碳纳米管，聚（3，4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）和/或聚乙酸乙烯酯，显示热功率弱相关的电导率，导致在大的热电功率因子在复合材料的面内方向，类似于160 μ W/m.K-2在室温下，这是数量级大于那些典型的聚合物复合材料。此外，它们的高电导率，在室温下类似于10（5）S/m，使我们的复合材料非常有希望用于各种电子应用。对于更好的功率因数的最佳纳米管浓度被确定为60重量%与40重量%的聚合物。注意到高于60重量%的高纳米管浓度由于不太有效的纳米管分散体而降低了复合材料的电导率。我们的60重量%的纳米管复合材料在室温下在面外方向上的热导率被测量为0.2-0.4 W/m.K。同时对纳米管的面内导热系数和接触导热系数进行了理论估算。
Typical organic materials have low thermal conductivities that are best suited to thermoelectrics, but their poor electrical properties with strong adverse correlations have prevented them from being feasible candidates. Our composites, containing single-wall carbon nanotubes, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and/or polyvinyl acetate, show thermo-powers weakly correlated with electrical conductivities, resulting in large thermoelectric power factors in the in-plane direction of the composites, similar to 160 mu W/m.K-2 at room temperature, which are orders of magnitude larger than those of typical polymer composites. Furthermore, their high electrical conductivities, similar to 10(5) S/m at room temperature, make our composites very promising for various electronic applications. The optimum nanotube concentrations for better power factors were identified to be 60 wt % with 40 wt % polymers. It was noticed that high nanotube concentrations above 60 wt % decreased the electrical conductivity of the composites due to less effective nanotube dispersions. The thermal conductivities of our 60 wt % nanotube composites In the out-of-plane direction were measured to be 0.2-0.4 W/m.K at room temperature. The in-plane thermal conductivity and thermal contact conductance between nanotubes were also theoretically estimated.