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Issue 13, 2017
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Ultrafast pressure sensing with transient tunnelling currents

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We report and systematically study large amplitude piezoresistance spikes in thin composite films under stress. These spikes are characterized by a unique double exponential decay which we demonstrate to be the signature of transient tunnelling currents. We establish an expression that predicts the dynamic conductivity of the composite with only three material parameters and use it to infer the magnitude of applied stress from resistance spikes, thus achieving quasi-instantaneous readout unhindered by viscoelastic relaxation. We demonstrate the proof of principle of ultrafast mechanoreceptors based on this effect by making a sensor array which images pressure at close to cinematic speeds with a sensitivity of 50 Pa.

Graphical abstract: Ultrafast pressure sensing with transient tunnelling currents

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Publication details

The article was received on 17 Feb 2017, accepted on 10 Mar 2017 and first published on 15 Mar 2017

Article type: Paper
DOI: 10.1039/C7NR01214D
Citation: Nanoscale, 2017,9, 4544-4549
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    Ultrafast pressure sensing with transient tunnelling currents

    A. S. Chauhan, I. Taylor-Harrod, S. D. Littlejohn and A. Nogaret, Nanoscale, 2017, 9, 4544
    DOI: 10.1039/C7NR01214D

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