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Networked Gold-Nanoparticle Coatings on Polyethylene: Charge Transport and Strain Sensitivity

机译：聚乙烯上的网络化金纳米粒子涂层：电荷传输和应变敏感性

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摘要

Networked films, comprising gold nanoparticles (ca. 4nm core diameter) and 1,9-nonanedithiol, are deposited onto oxidized low-density polyethylene (LDPE) substrates via layer-by-layer self-assembly. Scanning electron microscopy and transmission electron microscopy images reveal a compact coating with a granular, nanoscale morphology. Conductance measurements at variable temperature are consistent with an Arrhenius-type activation of charge transport (activation energy: 52meV). The excellent mechanical robustness of the coatings allows for studying their potential application as strain gauges. Expanding the films by up to 3% is accompanied by a reversible and approximately linear increase in resistance of up to approximately 50% (gauge factor ca. 17). Analyzing the results with an activated tunneling model suggests that the average increase in interparticle distances is significantly smaller than the geometric expansion at the substrate surface.
机译：包含金纳米颗粒（核心直径约4nm）和1,9-壬二酚的网络化薄膜通过逐层自组装沉积在氧化的低密度聚乙烯（LDPE）基材上。扫描电子显微镜和透射电子显微镜图像显示出具有颗粒状，纳米级形态的致密涂层。可变温度下的电导率测量与电荷传输的Arrhenius型激活（激活能量：52meV）一致。涂层优异的机械强度使其可以研究其作为应变仪的潜在应用。使薄膜膨胀最多3％时，电阻可逆且近似线性增加，最高可达大约50％（规格系数约为17）。使用激活的隧穿模型分析结果表明，粒子间距离的平均增加量明显小于基材表面的几何膨胀量。

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