Enhanced Thermoelectric Performance of Single-Walled Carbon Nanotubes/Polyaniline Hybrid Nanocomposites
Enhanced Thermoelectric Performance of Single-Walled Carbon Nanotubes/Polyaniline Hybrid Nanocomposites
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DOI：
10.1021/nn1002562
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发表时间：
2010-04-01
期刊：
影响因子：
17.1
通讯作者：
Chen, Xihong
中科院分区：
文献类型：
--
作者：
Yao, Qin;Chen, Lidong;Chen, Xihong
以单壁纳米管(SWNT)为模板，以苯胺为反应物，通过原位聚合反应制备了碳纳米管(CNTs)/有序聚苯胺(PANI)杂化纳米复合材料。电子显微镜、扫描电子显微镜、X射线衍射仪和拉曼光谱分析表明，在单壁碳纳米管定向聚合过程中，聚苯胺沿碳纳米管表面生长，形成有序的链状结构。与纯PANI相比，SWNT/PANI纳米复合材料具有更高的电导率和Seebeck系数，这可以归因于PANI有序链结构中载流子迁移率的提高。复合材料的最大电导率和塞贝克系数分别达到1.25×10~(-4)S m~(-1)和40 mV·K~(-1)，最大功率因数达到2×10~(-5)W·m~(-1)K~(-2)，比纯聚苯胺高2个数量级以上。这项研究表明，构建高度有序的链结构是改善导电聚合物热电性能的一种新的有效途径。
Hybrid nanocomposites containing carbon nanotubes (CNTs) and ordered polyaniline (PANI) have been prepared through an in situ polymerization reaction using a single-walled nanotube (SWNT) as template and aniline as reactant. TEM, SEM, XRD, and Raman analyses show that the polyaniline grew along the surface of CNTs forming an ordered chain structure during the SWNT-directed polymerization process. The SWNT/PANI nanocomposites show both higher electrical conductivity and Seebeck coefficient as compared to pure PANI, which could be attributed to the enhanced carrier mobility in the ordered chain structures of the PANI. The maximum electrical conductivity and Seebeck coefficient of composites reach 1.25 x 10(4) S m(-1) and 40 mu V K-1 respectively, and the maximum power factor is up to 2 x 10(-5) W m(-1) K-2, more than 2 orders of magnitude higher than the pure polyaniline. This study suggests that constructing highly ordered chain structure is a novel and effective way for improving the thermoelectric properties of conducting polymers.