Ionic Current Rectification Enabled by Interfacial Solidification of Fixed Polymeric Ions in Ionoelastomer Heterojunctions
발표자
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초록
내용
Ionoelastomers(IEs) are conductive elastomers characterized by one ion species being anchored to the polymer network while the counter ion can freely move. The junction of IEs with opposite charges creates an ionic double layer(IDL), enabling the diode-like ionic current rectification. In this study, we demonstrate the rectifying behavior of IE heterojunction is predominantly governed by the glass solidification of interfacial polymeric ions complex(PIC) at the heterojunction of IEs. Applying a reverse bias to IE heterojunction depletes free counterions at the interface, solidifying PIC and thereby limiting the ionic current. Under a forward bias condition, counterions are concentrated at the interface, leading to softening of the complex, which allows the current flow. Likewise, Raising temperature of the IE heterojunction above Tg of PIC, ionic current can flow. Our study suggests the vivid mechanism of rectification of ionic diodes, and provides useful insights for enhancing their rectifying performance.