Organic electrochemical devices for biosensing



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Project Description

Organic Electrochemical Transistors (OECTs) are transducers of ionic to electronic currents,  consisting of three electrodes (source, drain, and gate), an organic semiconductor acting as the  active material connecting the source and the drain, and a liquid electrolyte positioned between the  semiconductor and the gate. The Nguyen’s group in the Center of Polymers and Organic Solids has recently reported a new active material for OECTs based on PCDTBT-SO3K, a.k.a. CPE-K, which exhibits a dual mode of ion doping and dedoping. After this discovery, the group demonstrated a high-performance organic electrochemical diode by connecting the gate and the source of a CPE-K OECT. The diodes exhibit a strong dependence on the concentration of the electrolyte, with the current decreasing as the concentration increases, with a response time in the range of a few seconds (Figure 4-B). For KCl, a peak of sensitivity of 2700 µA/dec is observed at the concentration range of 1 mM to 10 mM, matching the range of interest for K+ in the human body fluids. The best sensitivity in the literature for transistor-based K+ detection is 224 µA/dec. The research work that the student is conducting will be part of the demonstration of ion-detection of CPE-K organic electrochemical diodes. 


Undergraduate Contribution

This spring quarter, the undergraduate research assistant works in the lab with the following tasks:- Electrolyte preparation, Device preparation and characterisation (spincoating, profilometer, optical microscopy), Data acquisition and treatment (data acquisition automation methods with Python, data visualization with Origin)


Requirements and/or Application Instructions

CHEM-2A, CHEM-2B, CHEM-2C, CHEM-6AL Organic chemistry