Flexible electronic synapses made waterproof, biocompatible

Flexible electronic synapses made waterproof, biocompatible

Technology News |
By eeNews Europe

Published in Nanoscale Horizons journal, under the title “Fully transparent, flexible and waterproof synapses with pattern recognition in organic environments”, the e-synapses’ reported synaptic behaviors included paired-pulse facilitation (PPF), long-term potentiation/depression (LTP/LTD), and learning–forgetting–relearning. Made of a layer of poly(3,4-ethylenedioxythiophene)/poly-styrene sulfonate (PEDOT/PSS) sandwiched between indium tin oxide (ITO) electrodes, the artificial synaptic device exhibited an optical transmittance of 87.5% in the visible light range, it operated reliably even when bent to a 5mm radius and was proven to withstand water and five types of common organic solvents for over 12 hours, functioning over 6000 spikes without noticeable degradation.

PEDOT:PSS was chosen as the functional layer,
sandwiched between two ITO electrode layers
(one of them patterned as microdots)

Using the transparent, flexible, and biocompatible e-synapses, the researchers then constructed a three-layer neural network system consisting of an input layer, a hidden layer, and an output layer connected with 256×128 and 128×10 e-synapses. The authors used resampled 16×16 pixel images of handwritten digits from the MNIST database (to match the 256 input neurons) and trained the multilayer perceptron network with 10,000 initial sample images based on back-propagation, keeping 500 images to verify the recognition effect. The article report a 92.4% recognition accuracy for the handwritten digits, promising lightweight, transparent, flexible and biocompatible neuromorphic computing systems.

Fudan University –

Related articles:

Low power artificial synapse chip points way to artificial brain

Plastic-based artificial synapse beats all energy-efficiency benchmarks

Synaptic transistor learns as it switches


If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :    eeNews on Google News


Linked Articles