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Synaptic dynamics in complex self-assembled nanoparticle networks

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Abstract

We report a detailed study of neuromorphic switching behaviour in inherently complex percolating networks of self-assembled metal nanoparticles. We show that variation of the strength and duration of the electric field applied to this network of synapse-like atomic switches allows us to control the switching dynamics. Switching is observed for voltages above a well-defined threshold, with higher voltages leading to increased switching rates. We demonstrate two behavioral archetypes and show how the switching dynamics change as a function of duration and amplitude of the voltage stimulus. We show that the state of each synapse can influence the activity of the other synapses, leading to complex switching dynamics. We further demonstrate the influence of the morphology of the network on the measured device properties, and the constraints imposed by the overall network conductance. The correlated switching dynamics, device stability over long periods, and the simplicity of the device fabrication provide an attractive pathway to practical implementation of on-chip neuromorphic computing.

Graphical abstract: Synaptic dynamics in complex self-assembled nanoparticle networks

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Publication details

The article was received on 30 May 2018, accepted on 10 Aug 2018 and first published on 24 Oct 2018


Article type: Paper
DOI: 10.1039/C8FD00109J
Citation: Faraday Discuss., 2019, Advance Article
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    Synaptic dynamics in complex self-assembled nanoparticle networks

    S. K. Bose, S. Shirai, J. B. Mallinson and S. A. Brown, Faraday Discuss., 2019, Advance Article , DOI: 10.1039/C8FD00109J

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