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This dissertation by Silan Zhang explores the use of organic mixed conductors (OMIECs) in organic electrochemical transistors (OECTs), emphasizing their potential in bioelectronics. The work highlights innovations in fabricating 3D-printed OECTs using a direct-write additive process, enabling the production of flexible, durable devices. These transistors demonstrate significant capabilities, such as dopamine biosensing and long-term memory response, suitable for sensors and neuromorphic hardware. The research addresses challenges like sluggish response times and operational stability, using materials like multi-walled carbon nanotubes and protective polymer layers to enhance performance. The study aims to inspire advancements in materials synthesis and device processing for scalable digital techniques.

Organic electrochemical transistors. --- Bioelectronics. --- Organic electrochemical transistors --- Bioelectronics

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This dissertation explores the development and application of organic electrochemical transistor (OECT) based biosensors for capacitive and faradaic sensing. It focuses on the integration of organic electronics with biological systems to enhance healthcare diagnostics and personalized medicine. The work examines the use of organic mixed ionic-electronic conductive polymers in OECTs, highlighting their potential in detecting biological signals and amplifying them into electrical outputs. The research discusses the adaptability of these sensors for point-of-care applications, such as glucose monitoring, and their role in addressing diagnostic challenges evidenced by the COVID-19 pandemic. The intended audience includes researchers and professionals in the fields of bioelectronics, materials science, and healthcare technology.

Organic electrochemical transistors. --- Biosensors. --- Organic electrochemical transistors --- Biosensors