2021/08/30 by Mahdi Ghazal, Ghazal, Mahdi, Michel Daher Mansour +11
Chemical Engineering · Chemistry · Engineering · Materials Science · #Advanced Sensor and Energy Harvesting Materials #Analytical Chemistry and Sensors #Conducting polymers and applications #Electrochemical Analysis and Applications #FOS: Electrical engineering #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2108.13218
openalex publication_date 2021/08/30 · openalex created_date 2022/09/13 · openalex updated_date 2026/07/28
Organic Electrochemical Transistors are considered today as a key technology to interact with biological medium through their intrinsic ionic-electronic coupling. In this paper, we show how this coupling can be finely tuned (in operando) post-microfabrication via electropolymerization technique. This strategy exploits the concept of adaptive sensing where both transconductance and impedance are tunable and can be modified on-demand to match different sensing requirements. Material investigation through Raman spectroscopy, atomic force microscopy and scanning electron microscopy reveals that electropolymerization can lead to a fine control of PEDOT microdomains organization, which directly affect the iono-electronic properties of OECTs. We further highlight how volumetric capacitance and effective mobility of PEDOT:PSS influence distinctively the transconductance and impedance of OECTs. This approach shows to improve the transconductance by 150% while reducing their variability by 60% in comparison with standard spin-coated OECTs. Finally, we show how to the technique can influence voltage spike rate hardware classificationwith direct interest in bio-signals sorting applications.