Details

Autor(en) / Beteiligte

• Ghazal, Mahdi
• Daher Mansour, Michel
• Scholaert, Corentin
• Dargent, Thomas
• Coffinier, Yannick
• Pecqueur, Sébastien
• Alibart, Fabien

Titel

Bio‐Inspired Adaptive Sensing through Electropolymerization of Organic Electrochemical Transistors

Ist Teil von

• Advanced electronic materials, 2022-03, Vol.8 (3), p.n/a

Ort / Verlag

Wiley

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Organic electrochemical transistors are considered today as a key technology to interact with a biological medium through their intrinsic ionic‐electronic coupling. In this paper, the authors show how this coupling can be finely tuned (in operando) post‐microfabrication via the 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 poly(3,4‐ethylenedioxythiophene) (PEDOT) microdomains organization, which directly affects the iono‐electronic properties of organic electrochemical transistors (OECTs). They further highlight how volumetric capacitance and effective mobility of PEDOT:polystyrene sulfonate 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, they show how the technique can influence voltage spike rate hardware classification with direct interest in bio‐signals sorting applications. The authors show how in‐operando electropolymerization of organic electrochemical transistors can implement adaptive bio‐sensors by tuning iono‐electronic properties of the material. This work is supported by detailed material and device analysis, which bring insightful information on iono‐electronic processes for bio‐sensing.