Microribbons composed of directionally self-assembled nanoflakes as highly stretchable ionic neural electrodes

Proceedings of the National Academy of Sciences of the United States of America
Mingchao ZhangYingying Zhang

Abstract

Many natural materials possess built-in structural variation, endowing them with superior performance. However, it is challenging to realize programmable structural variation in self-assembled synthetic materials since self-assembly processes usually generate uniform and ordered structures. Here, we report the formation of asymmetric microribbons composed of directionally self-assembled two-dimensional nanoflakes in a polymeric matrix during three-dimensional direct-ink printing. The printed ribbons with embedded structural variations show site-specific variance in their mechanical properties. Remarkably, the ribbons can spontaneously transform into ultrastretchable springs with controllable helical architecture upon stimulation. Such springs also exhibit superior nanoscale transport behavior as nanofluidic ionic conductors under even ultralarge tensile strains (>1,000%). Furthermore, to show possible real-world uses of such materials, we demonstrate in vivo neural recording and stimulation using such springs in a bullfrog animal model. Thus, such springs can be used as neural electrodes compatible with soft and dynamic biological tissues.

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Citations

Jan 19, 2021·Chemical Reviews·Chunya WangTakao Someya
Jun 25, 2021·Advanced Science·Donghui WangXuanyong Liu
Jul 27, 2021·IScience·Yong ZhangYingying Zhang
Dec 5, 2020·ACS Central Science·Weipeng ChenLiping Wen
May 30, 2021·Advanced Healthcare Materials·Mengjia ZhuYingying Zhang
Oct 29, 2021·ACS Applied Materials & Interfaces·Dharneedar RavichandranKenan Song
Nov 20, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Boyu XuXiao-Dong Zhang
Oct 27, 2021·Advanced Materials·Jiayao ChenKun Zhou

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