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.
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- Department of Physics - Professor
- Centre for Networks and Collective Behaviour
- Centre for Nanoscience and Nanotechnology
- Condensed Matter Physics CDT
- Institute for Mathematical Innovation (IMI)
- Centre for Therapeutic Innovation
- Centre for Mathematical Biology
Person: Research & Teaching