Department of Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003, USA.
John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, MA 02138, USA.
Science. 2020 Feb 14;367(6479):773-776. doi: 10.1126/science.aay8467.
Soft ionic conductors have enabled stretchable and transparent devices, but liquids in such devices tend to leak and evaporate. In this study, we demonstrate diodes and transistors using liquid-free ionoelastomers, in which either anions or cations are fixed to an elastomer network and the other ionic species are mobile. The junction of the two ionoelastomers of opposite polarity yields an ionic double layer, which is capable of rectifying and switching ionic currents without electrochemical reactions. The entropically driven depletion of mobile ions creates a junction of tough adhesion, and the stretchability of the junction enables electromechanical transduction.
软离子导体使可拉伸和透明的设备成为可能，但此类设备中的液体往往会泄漏和蒸发。在这项研究中，我们使用无液体的离子弹性体展示了二极管和晶体管，其中阴离子或阳离子固定在弹性体网络上，而其他离子则是可移动的。两种带相反电荷的离子弹性体的连接处产生了离子双电层，它能够在不发生电化学反应的情况下对离子电流进行整流和开关。移动离子的熵驱动耗尽产生了坚固的粘结连接，连接的可拉伸性实现了机电转换。
