Granular metal–carbon nanocomposites as piezoresistive sensor films – Part 2: Modeling longitudinal and transverse strain sensitivity
Granular metal–carbon nanocomposites as piezoresistive sensor films – Part 2: Modeling longitudinal and transverse strain sensitivity
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DOI：
10.5194/jsss-7-69-2018
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发表时间：
2018-02
影响因子：
1
通讯作者：
S. Schwebke;U. Werner;G. Schultes
中科院分区：
文献类型：
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作者：
S. Schwebke;U. Werner;G. Schultes
摘要。颗粒状和柱状镍碳复合材料可能表现出较大的应变灵敏度，这使它们成为一种有趣的传感器材料。基于实验结果和材料的形态特征，我们建立了薄膜中的电子传递模型，并用它来解释其压阻效应。首先，我们描述了一个电子在粒子间传递的模型。然后将该模型应用于无序薄膜的电阻和应变特性的蒙特卡罗模拟，给出了薄膜特性的第一个解释。仿真结果揭示了横向灵敏度的来源，并揭示了粒子分离和几何无序等参数对横向灵敏度的影响。金属颗粒和碳基体弹性模量不同导致的局部应变增强是提高应变敏感性的重要影响因素。
Abstract. Granular and columnar nickel–carbon composites may exhibit large strain sensitivity, which makes them an interesting sensor material. Based on experimental results and morphological characterization of the material, we develop a model of the electron transport in the film and use it to explain its piezoresistive effect. First we describe a model for the electron transport from particle to particle. The model is then applied in Monte Carlo simulations of the resistance and strain properties of the disordered films that give a first explanation of film properties. The simulations give insights into the origin of the transverse sensitivity and show the influence of various parameters such as particle separation and geometric disorder. An important influence towards larger strain sensitivity is local strain enhancement due to different elastic moduli of metal particles and carbon matrix.