Polymer nanocomposites with vital reinforcements of conductive fillers have evinced as next-generation high-performance materials with multi-functional applications. Herein, we report the facile synthesis of thermally stable, highly electrically conducting polyaniline multi-walled carbon nanotubes (PANI/MWCNT) nanocomposites doped in two different protonic acids, i.e. hydrochloric acid (HCl) and sulphuric acid (H2SO4). The doping acids significantly affect the electric and dielectric properties of conducting polymer nanocomposites. The paper probes in the synergistic effects of MWCNTs and the effect of doping acid on the thermal stability, conductivity and dielectric properties of the nanocomposites based on PANI nanofibres. The structural, morphological, optical, thermal and electrical properties were evaluated through X-ray diffraction, scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, UV–Vis spectroscopy, thermogravimetric analysis and two-point probe technique. Ascribed to the high interfacial interaction between PANI and MWCNT, and considering the effect of doping acids, nanocomposites with high thermal stability, enhanced conductivity and high dielectric constant that can store large electrical charges have been synthesized by surfactant-assisted, in situ oxidative polymerization of aniline, in the presence of potassium persulfate as oxidant. The micellar structure of surfactant assists the dispersion of MWCNTs as well as the formation of PANI/MWCNT tubular structures. The effect of surfactant below and above critical micelle concentration was also studied. This complete study would affirm such a nanocomposite which procures excellent electrical and dielectric properties for microelectronic applications.

中文翻译：

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不同质子酸掺杂聚苯胺多壁碳纳米管纳米复合材料的电学和介电性能研究

具有重要导电填料增强功能的聚合物纳米复合材料已被证明是具有多功能应用的下一代高性能材料。在此，我们报告了掺杂两种不同质子酸，即盐酸 (HCl) 和硫酸 (H2SO4) 的热稳定、高导电聚苯胺多壁碳纳米管 (PANI/MWCNT) 纳米复合材料的简便合成。掺杂酸显着影响导电聚合物纳米复合材料的电和介电性能。该论文探讨了 MWCNT 的协同效应以及掺杂酸对基于 PANI 纳米纤维的纳米复合材料的热稳定性、导电性和介电性能的影响。通过 X 射线衍射评估结构、形态、光学、热学和电学性质，扫描电子显微镜、拉曼光谱、傅里叶变换红外光谱、紫外-可见光谱、热重分析和两点探针技术。由于聚苯胺和多壁碳纳米管之间的高界面相互作用，并考虑掺杂酸的影响，通过表面活性剂辅助的原位氧化聚合合成了具有高热稳定性、增强电导率和高介电常数、可以储存大量电荷的纳米复合材料。苯胺，在过硫酸钾作为氧化剂的存在下。表面活性剂的胶束结构有助于多壁碳纳米管的分散以及聚苯胺/多壁碳纳米管管状结构的形成。还研究了低于和高于临界胶束浓度的表面活性剂的影响。