Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Applied Physics | en_US |
| dc.contributor.advisor | Yan, Feng (AP) | en_US |
| dc.creator | Tian, Zhiyuan | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/13433 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Two-terminal organic electrochemical transistors and their applications | en_US |
| dcterms.abstract | Flexible bioelectronics is gaining interest as a vital medium for connecting electronics and biological systems. Organic electrochemical transistors (OECTs), a part of flexible electronics, are highly effective in constructing biochemical and bioelectric sensors due to their intrinsic amplification function and ion-to-electron conversion property. However, conventional OECT sensors seldom combine with other flexible components due to the lack of integration technology. Novel fabric OECT sensor has emerged as a versatile sensing platform due to its portability, low cost, and integration capabilities. | en_US |
| dcterms.abstract | In this thesis, a literature review on the profiles and integration technologies of OECT will first be presented. The fundamental information about OECT, including typical three-terminal design, working principles, advantages, and functions, will be introduced in detail. Besides, a widely used theoretical model based on the depletion mechanism will be offered. Furthermore, the characteristics and integration technologies of flexible fiber-shaped and planar OECTs are summarized. | en_US |
| dcterms.abstract | Secondly, a novel fabric two-terminal OECT by integrating gate and drain terminals is investigated thoroughly. This unique design combines the gate and drain terminals, allowing the sensor to be fabricated on a single wire rather than the multiple wires required by a typical three-terminal structure. This character significantly reduces fabrication complexities and reliability risks. The two-terminal design has an excellent on/off ratio, low subthreshold swing, and fast response for both P- and N-type OECTs. Besides, a general de-doping/doping model is built successfully to explain the underlying mechanism. Additionally, the fabric two-terminal OECTs are applied to fabricate high-gain inverters and fast-response rectifiers, showing their high potential for wearable electronic textile systems. | en_US |
| dcterms.abstract | Lastly, a two-terminal n-type OECT sensor based on BBL organic semiconductor is developed to detect ion concentration. Different from conventional PEDOT:PSS based p-type OECT sensors, n-type sensors have an obvious advantage in low power consumption. The two-terminal configuration of the sensor avoids the decrease in conductivity at high gate voltage due to the anti-ambipolarity property of BBL material. This sensor has an impressive voltage response of nearly 100 mV/dec for NaCl and KCl electrolytes, which largely breaks the theoretical Nernst limit (59.2 mV/dec). Upon this foundation, a highly sensitive fiber-shaped K+-selective sensor has been demonstrated using PVC-based ion selective membrane and hydrogel. The design of this sensor is compatible with traditional weaving techniques and has shown potential for use in wearable electronics with multiple functions. | en_US |
| dcterms.abstract | In summary, fiber-shaped OECT sensors with two terminals have been successfully created and used in bioelectronics. Remarkably, an impressive n-type OECT sensor has been developed with low power consumption and high voltage response used for detecting K+ selectively. The fabric OECT sensors can be integrated into a multifunctional e-textile system by weaving them with other fiber-shaped components, such as energy-harvesting devices, energy storage devices, and displays. This development could potentially revolutionize current diagnostic and physiological monitoring methods. | en_US |
| dcterms.extent | xi, 89 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2023 | en_US |
| dc.abstract | All Master | en_US |
| dcterms.educationalLevel | M.Phil. | en_US |
| dcterms.LCSH | Organic electrochemical transistors | en_US |
| dcterms.LCSH | Bioelectronics | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | open access | en_US |
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