Integrated opposite charge grafting induced ionic-junction fiber

Abstract

The emergence of ionic-junction devices has attracted growing interests due to the potential of serving as signal transmission and translation media between electronic devices and biological systems using ions. Among them, fiber-shaped iontronics possesses a great advantage in implantable applications owing to the unique one-dimensional geometry. However, fabricating stable ionic-junction on curved surfaces remains a challenge. Here, we developed a polyelectrolyte based ionic-junction fiber via an integrated opposite charge grafting method capable of large-scale continuous fabrication. The ionic-junction fibers can be integrated into functions such as ionic diodes and ionic bipolar junction transistors, where rectification and switching of input signals are implemented. Moreover, synaptic functionality has also been demonstrated by utilizing the fiber memory capacitance. The connection between the ionic-junction fiber and sciatic nerves 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 pathways 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.…”

Semiconductor fibers for textile integrated electronic systems

“…(b) Coating methods for flexible and long semiconductor fibers. (I) Industrial scrape-coating fabrication line for producing long fibers [ 9 ]. (II) Dip-coating functional layers sequentially on the fiber surface to realize organic electrochemical transistor with coaxial structure [ 8 ].…”

“…Figure 1a is reprinted with permission from Refs [ 5–7 ]. Figure 1b is reprinted with permission from Refs [ 8 , 9 ]. Figure 1c is reprinted with permission from Ref.…”

“…The coating method mainly applies functional layers sequentially on the fiber surface by scraping or dipping to realize a fiber with a coaxial structure for solution-processable semiconductor materials, such as conjugated polymers, quantum dots and metal oxide nanoparticles (Fig. 1b ) [ 8 , 9 ]. However, it remains an unsolved problem to efficiently split the device along the fiber axis, so the achieved functions are mainly limited at the single-device level [ 8 , 9 ].…”

“…1b ) [ 8 , 9 ]. However, it remains an unsolved problem to efficiently split the device along the fiber axis, so the achieved functions are mainly limited at the single-device level [ 8 , 9 ]. The molten-core methods have recently aroused great interest because they can produce inorganic fibers (based on Si and Ge) in hundreds of meters with single or multiple cores (Fig.…”