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Issue 3, 2019
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Characterizing percolative materials by straining

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Carrier transport in a wide range of nanomaterial assemblies proceeds by percolation through discontinuous networks of constituents. Improving percolative nanomaterials could enhance transparent conductors, sensors, and electronic devices. A significant obstacle in optimizing percolative materials is the challenge in their characterization. The critical connection pathways which determine a percolative material's conductivity are not easily accessible with existing metrology tools and traditional investigation approaches rely on indirect methods based on many samples and on simplifying assumptions. We here demonstrate the direct extraction of characteristic parameters from a single sample by analyzing the strain-dependent resistance of percolative materials. An analytical model is derived that can explain experimental data for various percolative materials, morphologies, and straining conditions. The relationship of the extracted parameters with previously introduced figures of merit allows us to compare nanostructures of diverse dimensionalities and compositions for applications such as strain gauges and transparent conductors.

Graphical abstract: Characterizing percolative materials by straining

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The article was received on 12 Nov 2018, accepted on 06 Dec 2018 and first published on 07 Dec 2018

Article type: Paper
DOI: 10.1039/C8NR09120J
Citation: Nanoscale, 2019,11, 1074-1079

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    Characterizing percolative materials by straining

    H. Yao, M. Hempel, Y. Hsieh, J. Kong and M. Hofmann, Nanoscale, 2019, 11, 1074
    DOI: 10.1039/C8NR09120J

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