| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recent Advances in Functional Materials and 2D/3D Processing for Sensors and Electronic Applications
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| Presentation Title |
Controlled Modulation of Gas Sensing in Printed Graphene: Nanoparticle Nucleation and Defect Engineering in Exfoliated Graphene Flakes
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| Author(s) |
Harrison Loh, Konstantinos Sierros |
| On-Site Speaker (Planned) |
Harrison Loh |
| Abstract Scope |
Liquid Phase Exfoliation (LPE) has been promoted as a low-cost and scalable method for synthesizing liquid dispersions of graphene. The relatively mild chemical environment in which LPE commonly occurs is expected to yield graphene with a relative absence of oxygen groups compared to its variant graphene oxide (GO). This lack of chemical diversity reduces the number of energetically favorable sites for gas adsorption, inhibiting this material in applications such as low-cost gas sensors. In this work, we report a solution-based method for altering the chemical nature and transport properties of dispersed LPE graphene flakes through the nucleation and growth of metallic nanoparticles and selective oxygen/defect induction. Graphene structure and associated properties are characterized via XPS, Raman, and FTIR. Sensing films are characterized via two/four-point electrical measurements and optically via UV/Vis Spectroscopy. Selectivity and sensitivity of sensors to gases (e.g. methane and hydrogen) are characterized by exposure to gas mixes. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |