论文标题
高度填充导电聚合物复合材料的非压力独立于平面电导率测量
Pressure-Independent Through-Plane Electrical Conductivity Measurements of Highly Filled Conductive Polymer Composites
论文作者
论文摘要
高度填充的导电聚合物复合材料（CPC）被广泛用于诸如用于聚合物电解质膜燃料电池的双极板材料和氧化还原流动电池，电磁干扰屏蔽和传感器，原因是它们的有用电气性能。确定这种高度填充的CPC的跨平面电导率$ \ left（σ_{\ rm tp} \ right）$的常见方法在电极和样品之间应用了一个导电碳纸，并施加了外部压力来改善电气接触。我们可以通过使用液体金属（例如凝胶式共晶合金（EGAIN）作为接触材料）来消除测得的$σ_{\ rm tp} $的压力依赖性。结果表明，与具有碳纸接触的测量值相比，Egain降低了接触电阻，并导致三到五倍的$σ_ {\ rm tp} $，而碳纸接触和压力最高为20 bar。
Highly filled conductive polymer composites (CPCs) are widely used in applications such as bipolar plate materials for polymer electrolyte membrane fuel cells and redox flow batteries, electromagnetic interference shielding and sensors due to their useful electrical properties. A common method for determining through-plane electrical conductivities $\left(σ_{\rm tp} \right)$ of such highly filled CPCs applies a conductive carbon paper between electrodes and sample with application of external pressure to improve electrical contact. We show the pressure-dependence of the measured $σ_{\rm tp}$ can be eliminated by using a liquid metal such as the gallium-indium eutectic alloy (EGaIn) as contact material. Results indicate that EGaIn reduces contact resistances and cause three to five times larger $σ_{\rm tp}$ compared to measurements with carbon paper contacts and pressures up to 20 bar.
