講演情報
[9p-C214-3]Molecular Interfacial Behavior in Ion-Gel Based Organic Electrochemical Transistors
〇Hanyu Sun1,2, Aisha Siddiqui3, Katsuhiko Ariga1,2,4, Yu Yamashita1,2 (1.NIMS, 2.The Univ. of Tokyo, 3.Univ. of Waterloo, 4.Tokyo Univ. of Science)
キーワード：
organic semiconductor、ion-gel、interface
Organic electrochemical transistors (OECTs) have attracted considerable attention as they transduce ionic signals into amplified electronic outputs. In particular, the uses of ion gels and semicrystalline polymeric semiconductors with well-controlled doping process contributes to reliability and high sensitivities. However, real biological and environmental samples contain a wide variety of dissolved ions and molecules, understanding of whose effects holds key to achieve stable operation of OECTs.
In this study, we systematically investigated how different classes of molecules influence the characteristics of ion-gel-based OECTs in aqueous environments. Hydrophilic and hydrophobic compounds induced only minor changes in the transfer characteristics, indicating that the devices maintain stable operation against a wide range of dissolved species. In contrast, amphiphilic molecules produced pronounced responses, whose signs depended on the charges of amphiphilic molecules.
These observations indicate that molecular interfacial behavior plays an important role in determining the response of ion-gel based OECTs. Accumulation of amphiphilic molecules at the water/hydrophobic ion gel interface modulates the local electrostatic environment, leading to measurable changes in the OECT characteristics. The present findings identify interfacial potential modulation as a key factor governing the response of ion-gel OECTs and provide a new strategy for chemical sensing based on the control of gel/water interfacial potentials.
In this study, we systematically investigated how different classes of molecules influence the characteristics of ion-gel-based OECTs in aqueous environments. Hydrophilic and hydrophobic compounds induced only minor changes in the transfer characteristics, indicating that the devices maintain stable operation against a wide range of dissolved species. In contrast, amphiphilic molecules produced pronounced responses, whose signs depended on the charges of amphiphilic molecules.
These observations indicate that molecular interfacial behavior plays an important role in determining the response of ion-gel based OECTs. Accumulation of amphiphilic molecules at the water/hydrophobic ion gel interface modulates the local electrostatic environment, leading to measurable changes in the OECT characteristics. The present findings identify interfacial potential modulation as a key factor governing the response of ion-gel OECTs and provide a new strategy for chemical sensing based on the control of gel/water interfacial potentials.