Operation mechanism of organic electrochemical transistors as redox chemical transducers
| Autor: | Scott T. Keene, Armantas Melianas, Alexander Giovannitti, Iain McCulloch, Maximilian Moser, Siew Ting Melissa Tan, Alberto Salleo |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Transconductance Transistor Charge density 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox Chemical reaction 0104 chemical sciences law.invention law Modulation Electrode Materials Chemistry Optoelectronics 0210 nano-technology business |
| Zdroj: | Journal of Materials Chemistry C. 9:12148-12158 |
| ISSN: | 2050-7534 2050-7526 |
| Popis: | The ability to control the charge density of organic mixed ionic electronic conductors (OMIECs) via reactions with redox-active analytes has enabled applications as electrochemical redox sensors. Their charge density-dependent conductivity can additionally be tuned via charge injection from electrodes, for instance in organic electrochemical transistors (OECTs), where volumetric charging of the OMIEC channel enables excellent transconductance and amplification of low potentials. Recent efforts have combined the chemical detection with the transistor function of OECTs to achieve compact electrochemical sensors. However, these sensors often fall short of the expected amplification performance of OECTs. Here, we investigate the operation mechanism of various OECT architectures to deduce the design principles required to achieve reliable chemical detection and signal amplification. By utilizing a non-polarizable gate electrode and conducting the chemical reaction in a compartment separate from the OECT, the recently developed Reaction Cell OECT achieves reliable modulation of the OECT channel's charge density. This work demonstrates that systematic and rational design of OECT chemical sensors requires understanding the electrochemical processes that result in changes in the potential (charge density) of the channel, the underlying phenomenon behind amplification. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|