Ultrafast pressure sensing with transient tunnelling currents

Ashok Singh Chauhan, Isaac Taylor-Harrod, Samuel Littlejohn, Alain Nogaret

Research output: Contribution to journalArticle

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Abstract

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 tunneling 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 viscoeleastic 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 50Pa.
Original languageEnglish
Pages (from-to)4544-4549
JournalNanoscale
Volume9
Issue number13
Early online date15 Mar 2017
DOIs
Publication statusPublished - 30 Mar 2017

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Sensor arrays
Composite films
Thin films
Composite materials

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Chauhan, A. S., Taylor-Harrod, I., Littlejohn, S., & Nogaret, A. (2017). Ultrafast pressure sensing with transient tunnelling currents. Nanoscale, 9(13), 4544-4549. https://doi.org/10.1039/C7NR01214D

Ultrafast pressure sensing with transient tunnelling currents. / Chauhan, Ashok Singh; Taylor-Harrod, Isaac; Littlejohn, Samuel; Nogaret, Alain.

In: Nanoscale, Vol. 9, No. 13, 30.03.2017, p. 4544-4549.

Research output: Contribution to journalArticle

Chauhan, AS, Taylor-Harrod, I, Littlejohn, S & Nogaret, A 2017, 'Ultrafast pressure sensing with transient tunnelling currents', Nanoscale, vol. 9, no. 13, pp. 4544-4549. https://doi.org/10.1039/C7NR01214D
Chauhan, Ashok Singh ; Taylor-Harrod, Isaac ; Littlejohn, Samuel ; Nogaret, Alain. / Ultrafast pressure sensing with transient tunnelling currents. In: Nanoscale. 2017 ; Vol. 9, No. 13. pp. 4544-4549.
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