A Stretchable Ionic Diode from Copolyelectrolyte Hydrogels with Methacrylated Polysaccharides
A Stretchable Ionic Diode from Copolyelectrolyte Hydrogels with Methacrylated Polysaccharides
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DOI：
10.1002/adfm.201806909
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发表时间：
2019-01-24
影响因子：
19
通讯作者：
Sun, Jeong-Yun
中科院分区：
文献类型：
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作者：
Lee, Hae-Ryung;Woo, Jaesung;Sun, Jeong-Yun
随着对柔软和柔性设备的需求稳步增长，凝胶材料展示的离子应用已成为人们关注的焦点。在这里，介绍了由聚电解质水凝胶制成的可拉伸和可穿戴的离子二极管（SID）。使用甲基丙烯酸酯化多糖对聚电解质水凝胶进行机械改性，同时保留聚（丙烯酸磺丙酯）钾盐（PSPA）和聚（[丙烯酰氨基丙基]三甲基氯化铵）（PDMAPAA-Q）的离子渗透选择性，形成离子共聚物。然后，在VHB基底上制备由聚电解质共聚物水凝胶组成的SID作为可拉伸的透明绝缘层，并通过激光雕刻。借助水凝胶和弹性体基材之间的完美粘附，SID 显示出超出 3 拉伸的矫正行为，并在数百次循环中保持其矫正性。 SID 的操作通过可穿戴离子电路进行可视化，该电路可在手指移动期间对离子电流进行整流并在正向偏压下点亮 LED。
As the demand for soft and flexible devices steadily increases, the ionic applications demonstrated with gel materials have come under the spotlight. Here, stretchable and wearable ionic diodes (SIDs) made from polyelectrolyte hydrogels are introduced. Polyelectrolyte hydrogels are mechanically modified using methacrylated polysaccharides while preserving the ion-permselectivity of poly(sulfopropyl acrylate) potassium salt (PSPA) and poly([acrylamidopropyl]trimethylammonium chloride) (PDMAPAA-Q), forming ionic copolymers. Then, SIDs composed of polyelectrolyte copolymer hydrogels are fabricated in VHB substrates as a stretchable and transparent insulating layer which is engraved by a laser. The SIDs show rectifying behaviors beyond the stretch of 3 with the aid of perfect adhesion between hydrogels and elastomeric substrates, and preserve their rectifications over hundreds of cycles. The operation of the SID is visualized by a wearable ionic circuit which rectifies ionic currents and lightens the LED under the forward bias during finger movements.