Granular metal-carbon nanocomposites as piezoresistive sensor films-Part 2: Modeling longitudinal and transverse strain sensitivity

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Date
2018
Volume
7
Issue
1
Journal
Series Titel
Book Title
Publisher
Göttingen : Copernicus Publ.
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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.

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Keywords
Carbon nanocomposite, Electron transport, Morphological characterization, Particle separation, Piezo-resistive sensors, Piezoresistive effects, Strain sensitivity, Transverse sensitivity
Citation
Schwebke, S., Werner, U., & Schultes, G. (2018). Granular metal-carbon nanocomposites as piezoresistive sensor films-Part 2: Modeling longitudinal and transverse strain sensitivity. 7(1). https://doi.org//10.5194/jsss-7-69-2018
License
CC BY 4.0 Unported