Fabrication of Functionalized Graphene Coated OTFT Humidity and Chloride Ion Sensors for Detecting Corrosion Precursors in Metallic Structures

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  • Corrosion monitoring has been the focus of structural health monitoring due to its damaging effects on metallic structures. Early detection of environmental factors responsible for corrosion can reduce maintenance related expenses. There is growing interest in developing compact and low-cost thin film sensors with high sensitivity to corrosion precursors. In this work, chemical sensors are fabricated using solution processed C60 organic thin film transistors (OTFTs) coated with functionalized graphene oxide for humidity sensing and functionalized graphene nanoparticles for Cl- detection. The fabricated OTFTs exhibit good carrier mobilities and current ON/OFF ratios reaching 1.2 cm2/V.s and 5x103, respectively. The rGO coated OTFT humidity sensor is designed for qualitative measurements, and it exhibits a relative responsivity for dry to surface wetness transition of 122.6%, with a response time of 20 ms. Chemically functionalized hydrogenated graphene coated OTFT is used for Cl- ion sensing which yielded sensitivity of 4%/ppm to ultrafine ionic concentrations.

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  • Copyright © 2022 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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  • 2022


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