Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 31, Pages 25834-25840Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07668
Keywords
organic electrochemical transistor; organic semiconductor; AC method; biosensor; dopamine sensor; thin film transistor
Funding
- Research Grants Council (RGC) of Hong Kong, China [C5015-15G]
- Hong Kong Polytechnic University [G-SB51]
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Organic electrochemical transistors (OECTs) have been successfully employed for a variety of applications, especially chemical and biological sensing. Although the device response to analytes can be directly monitored by measuring steady-state channel currents of the devices, it is challenging to obtain stable signals with high signal-to-noise ratios. In this work, we developed a novel method for electrochemical sensing by measuring both the transconductance and the phase of the AC channel current for the first time. Then we successfully realized highly sensitive ion strength sensors and dopamine sensors based on the AC method. Our results indicate that the AC method is more sensitive than typical DC methods and can provide more stable data in sensing applications. Considering that the sensors can be conveniently integrated with AC circuits, this technology is expected to find broad applications in the future.
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