Improved Thermoelectric Behavior of Nanotube-Filled Polymer Composites with Poly(3,4-ethylenedioxythiophene) Poly(styrenesulfonate)
Improved Thermoelectric Behavior of Nanotube-Filled Polymer Composites with Poly(3,4-ethylenedioxythiophene) Poly(styrenesulfonate)
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DOI：
10.1021/nn9013577
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发表时间：
2010-01-01
期刊：
影响因子：
17.1
通讯作者：
Yu, Choongho
中科院分区：
文献类型：
--
作者：
Kim, Dasaroyong;Kim, Yeonseok;Yu, Choongho
碳纳米管 (CNT) 填充的聚合物复合材料的热电性能可以通过使用聚（3,4-乙撑二氧噻吩）聚（苯乙烯磺酸）（PEDOT:PSS）改性 CNT 之间的连接来增强，从而产生高电导率（高达 40000 S/m），而不会显着改变热电势（或塞贝克系数）。这是因为 PEDOT:PSS 颗粒被装饰在 CNT 的表面，从而电连接 CNT 之间的连接点。另一方面，由于 CNT 和 PEDOT:PSS 之间不同的键合和振动光谱，热传输仍然与典型聚合物材料相当。这种行为与热电特性强相关的典型半导体的行为非常不同。解耦热电特性被认为是由于热断开而产生的，这对于开发更好的热电材料来说是理想的。以及碳纳米管之间的电连接接触结。发现连接处的载流子传输强烈依赖于稳定剂的类型和浓度。通过表征CNT与稳定剂重量比为1:1-1:4的导电PEDOT:PSS和阿拉伯绝缘胶(GA)合成的复合材料的输运特性，揭示了稳定剂的关键作用，并研究了复合材料合成温度以及CNT类型和浓度对热电性能的影响。在本研究中，单壁 (SW) CNT 填充复合材料在室温下干燥，然后在 80 摄氏度下干燥，表现出最佳的热电性能。本研究中的最高热电品质因数 (ZT) 在室温下估计接近 0.02，比大多数聚合物至少高一个数量级，并且比块体硅高至少一个数量级。对具有高热电性能的各种聚合物和纳米颗粒的进一步研究可能会产生经济、轻质、高效的聚合物热电材料。
The thermoelectric properties of carbon nanotube (CNT)-filled polymer composites can be enhanced by modifying junctions between CNTs using poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), yielding high electrical conductivities (up to similar to 40000 S/m) without significantly altering thermopower (or Seebeck coefficient). This is because PEDOT:PSS particles are decorated on the surface of CNTs, electrically connecting junctions between CNTs. On the other hand, thermal transport remains comparable to typical polymeric materials due to the dissimilar bonding and vibrational spectra between CNT and PEDOT:PSS. This behavior is very different from that of typical semiconductors whose thermoelectric properties are strongly correlated. The decoupled thermoelectric properties, which is ideal for developing better thermoelectric materials, are believed to be due to thermally disconnected. and electrically connected contact junctions between CNTs. Carrier transport at the junction is found to be strongly dependent on the type and concentration of stabilizers. The crucial role of stabilizers was revealed by characterizing transport characteristics of composites synthesized by electrically conducting PEDOT:PSS and insulating gum Arabic (GA) with 1:1-1:4 weight ratios of CNT to stabilizers, The influence of composite synthesis temperature and CNT-type and concentration on thermoelectric properties has also been studied. Single-walled (SW) CNT-filled composites dried at room temperature followed by 80 degrees C exhibited the best thermoelectric performance in this study. The highest thermoelectric figure of merit (ZT) in this study is estimated to be similar to 0.02 at room temperature, which is at least one order of magnitude higher than most polymers and higher than that of bulk Si. Further studies with various polymers and nanoparticles with high thermoelectric performance may result in economical, lightweight, and efficient polymer thermoelectric materials.