An efficient thermoelectric material: preparation of reduced graphene oxide/polyaniline hybrid composites by cryogenic grinding
An efficient thermoelectric material: preparation of reduced graphene oxide/polyaniline hybrid composites by cryogenic grinding
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DOI：
10.1039/c4ra12051e
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发表时间：
2015-01
期刊：
影响因子：
3.9
通讯作者：
Weijie Wang;Qihao Zhang;Jianlin Li;Xia Liu;Lianjun Wang;Juanjuan Zhu;Wei Luo;Wan Jiang
中科院分区：
文献类型：
--
作者：
Weijie Wang;Qihao Zhang;Jianlin Li;Xia Liu;Lianjun Wang;Juanjuan Zhu;Wei Luo;Wan Jiang
介绍了一种制备导电还原氧化石墨烯/聚苯胺（rGO/PANI）杂化复合材料的方法，该杂化材料具有高的热电性能。通过低温研磨将rGO和PANI均匀混合，然后通过放电等离子烧结进行固结。采用X射线衍射、X射线光电子能谱、傅里叶变换红外光谱和透射电子显微镜对复合材料的相结构和显微结构进行了表征。结果表明，CG技术不仅可以有效地细化PANI的晶粒尺寸，而且可以诱导更多的位错。由于PANI与rGO之间存在较强的π-π共轭作用，使得PANI颗粒在rGO模板上均匀分散、有序排列。系统研究了不同rGO含量的聚苯胺样品的热电性能。与纯PANI相比，rGO/PANI杂化复合材料的热电性能有明显的提高。塞贝克系数和电导率都显着增加，这是由于载流子迁移率的增加。复合材料的最大塞贝克系数和电导率分别达到15.934 μV K−1和1858.775 S m−1，最大ZT达到4.23 × 10−4。
An alternative and facile strategy to fabricate conducting reduced graphene oxide/polyaniline (rGO/PANI) hybrid composites with highly enhanced thermoelectric properties is introduced. rGO and PANI were homogeneously mixed by cryogenic grinding and then consolidated via spark plasma sintering. X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscopy were employed to evaluate the phase structure and microstructure of the as-prepared composites. The results show that the CG technique could not only effectively refine the grain size of PANI, but also could induce more dislocations. The refined PANI particles are homogeneously dispersed and orderly arranged on the rGO templates as a result of the strong π–π conjugated interactions between PANI and rGO. The thermoelectric properties of the PANI samples containing different rGO content were systematically investigated. Compared with pure bulk PANI, rGO/PANI hybrid composites exhibit a distinct enhancement in the thermoelectric performance. Both the Seebeck coefficient and the electric conductivity were found to increase remarkably, resulting from the increased carrier mobility. The maximum Seebeck coefficient and electric conductivity of the rGO/PANI hybrid composites amazingly reached 15.934 μV K−1 and 1858.775 S m−1, respectively, and the maximum ZT was up to 4.23 × 10−4.