11:15 AM - 11:30 AM
▼ [19a-Z18-9] Extended-Gate Type Organic Transistor Functionalized with Molecularly Imprinted Polydopamine for Taurine Detection
Keywords:chemical sensor, molecularly imprinted polymer, organic transistor
Molecularly imprinted polymers (MIPs) are known for the highly-sensitive and selective detection of target molecules, which stems from specific cavities in the polymers. For exploring low-cost and easy-to-use applications of MIPs, herein we have developed a MIP-attached organic field-effect transistor (MIP-OFET). The OFET possesses an extended gate electrode covered with an electrochemically polymerized dopamine for the detection of taurine (Tau). The capture of Tau by the MIP has effects on the surface potential on the extended-gate, leading to the change in threshold voltage of the OFET. First, we optimized and evaluated the conformation and noncovalent interactions of the molecular cluster among monomers and Tau by the DFT calculation. Next, we applied cyclic voltammetry for the electrochemical polymerization, followed by the extraction of the template. Differential pulse voltammetry was utilized to evaluate the recombination of Tau and the MIP. Finally, we investigated the sensing ability of the MIP-OFET. As a result, the threshold voltage shift in transfer characteristics showed a response to Tau, indicating the highly sensitive detection.