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A comparative study on the AC/DC conductivity, dielectric and optical properties of polystyrene/graphene nanoplatelets (PS/GNP) and multi-walled carbon nanotube (PS/MWCNT) nanocomposites
Polymer Testing ( IF 5.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.polymertesting.2020.106682
Ömer Bahadır Mergen , Evrim Umut , Ertan Arda , Selim Kara

Abstract Polystyrene/graphene nanoplatelets (PS/GNP) and polystyrene/multi-walled carbon nanotube (PS/MWCNT) nanocomposites were prepared through solution mixing processing. The effect of carbon filler (CF) (GNP or MWCNT) doping on the DC/AC electrical conductivity, dielectric characteristics and optical parameters (absorption coefficient, α and band gap energy, Eg) of nanocomposites were investigated and compared for similar doping concentrations. The observed behavior of the DC surface conductivity for PS/CF nanocomposites was explained according to the classical percolation theory, where the percolation thresholds (ϕc) for PS/GNP and PS/MWCNT nanocomposites were determined as 12.0 vol% and 3.81 vol% and the critical exponents (t) were calculated as 2.19 and 2.13, respectively. These results indicate that CFs create three dimensional CF network in PS matrix. The dielectric relaxation properties and the AC conductivity studied by means of Broadband Dielectric Spectroscopy (BDS) measurements, showed that the presence of carbon fillers significantly enhanced the capacitive/charge storage capabilities of the nanocomposites. The optical band gap energies (Eg) of PS/GNP and PS/MWCNT nanocomposites were obtained by using Tauc method. From applicative point of view, with their enhanced dielectric and AC conductivity properties of the PS/GNP and PS/MWCNT nanocomposites have the potential to be used in energy storage and electromagnetic interference (EMI) shielding applications.

中文翻译:

聚苯乙烯/石墨烯纳米片 (PS/GNP) 和多壁碳纳米管 (PS/MWCNT) 纳米复合材料的 AC/DC 电导率、介电和光学性能的比较研究

摘要 通过溶液混合工艺制备了聚苯乙烯/石墨烯纳米片(PS/GNP)和聚苯乙烯/多壁碳纳米管(PS/MWCNT)纳米复合材料。研究了碳填料 (CF)(GNP 或 MWCNT)掺杂对纳米复合材料的 DC/AC 电导率、介电特性和光学参数(吸收系数,α 和带隙能量,Eg)的影响,并在相似的掺杂浓度下进行了比较。PS/CF 纳米复合材料的 DC 表面电导率的观察行为根据经典渗流理论进行解释,其中 PS/GNP 和 PS/MWCNT 纳米复合材料的渗流阈值 (ϕc) 确定为 12.0 vol% 和 3.81 vol%,并且临界指数 (t) 分别计算为 2.19 和 2.13。这些结果表明 CF 在 PS 矩阵中创建了三维 CF 网络。通过宽带介电光谱 (BDS) 测量研究的介电弛豫特性和交流电导率表明,碳填料的存在显着增强了纳米复合材料的电容/电荷存储能力。通过使用Tauc方法获得PS/GNP和PS/MWCNT纳米复合材料的光学带隙能量(Eg)。从应用的角度来看,PS/GNP 和 PS/MWCNT 纳米复合材料具有增强的介电和交流电导率特性,具有用于能量存储和电磁干扰 (EMI) 屏蔽应用的潜力。表明碳填料的存在显着增强了纳米复合材料的电容/电荷存储能力。通过使用Tauc方法获得PS/GNP和PS/MWCNT纳米复合材料的光学带隙能量(Eg)。从应用的角度来看,PS/GNP 和 PS/MWCNT 纳米复合材料具有增强的介电和交流电导率特性,具有用于能量存储和电磁干扰 (EMI) 屏蔽应用的潜力。表明碳填料的存在显着增强了纳米复合材料的电容/电荷存储能力。通过使用Tauc方法获得PS/GNP和PS/MWCNT纳米复合材料的光学带隙能量(Eg)。从应用的角度来看,PS/GNP 和 PS/MWCNT 纳米复合材料具有增强的介电和交流电导率特性,具有用于能量存储和电磁干扰 (EMI) 屏蔽应用的潜力。
更新日期:2020-10-01
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