Integrated Opposite Charge Grafting Induced Ionic-junction Fiber

Abstract

The emergence of ionic-junction devices has attracted growing interests for the potential of serving as signal transmission and translation media between electronic devices and biological carrier systems with ions. Among them, fiber-shaped iontronics possesses great advantage in implantable applications owing to the unique one-dimensional geometry, but is restricted to the challenges in the fabrication of fixed cation-anion junction on curved surface. Here, we developed a polyelectrolyte heterojunction-based ionic-junction fiber via an integrated opposite charge grafting process capable of kilometer scale fabrication. The ionic-junction fibers can be integrated to functions such as ionic diodes and ionic bipolar junction transistors, where “0–1” rectification and “on-off” switch of input signals are implemented. Moreover, synaptic functionality has also been demonstrated by utilizing the fiber memory capacitance. Connection between our ionic-junction fiber and sciatic nerve of the mouse simulating end-to-side anastomosis is further performed to realize effective nerve signal conduction, verifying the capability for next-generation artificial neural pathway in implantable bioelectronics.

Graphene oxide–DNA/graphene oxide–PDDA sandwiched membranes with neuromorphic function

“…41,42 Till now, many polyelectrolyte-solid particles composites have been proposed, including physical confinement by polymer matrix, chemical crosslinking, cationic bonding, and others. 43,44 Thus, the creation of interfaces based on water-soluble polyelectrolytes in a confined medium makes it possible to obtain asymmetric ion transport in a neuromorphic device. 45 In this manuscript, a new type of artificial synapse is proposed using GO-polyelectrolyte composites.…”