| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials: Preparation, Properties, Modeling & Applications
|
| Presentation Title |
Dual-frequency Ultrasound-assisted Exfoliation of Graphene: Mechanisms and Implementation |
| Author(s) |
Dmitry G. Eskin, Anastasia Tyurnina, Justin Morton, Amanpreet Kaur, Nicole Grobert, Kyriakos Porfyrakis, Jiawei Mi, Iakovos Tzanakis |
| On-Site Speaker (Planned) |
Dmitry G. Eskin |
| Abstract Scope |
There is an urgent need for the scalable production of high-quality 2D materials (e.g., graphene) to supply ever-growing range of applications. Yet the currently adopted technologies use harsh and harmful organic solvents (e.g., NMP) to promote exfoliation, followed by high-shear or ultrasonication for the dispersion of the exfoliated flakes. In this presentation we describe a cost-efficient and eco-friendly method for producing controllable few-layer graphene (5-layers or less) with reasonable sizes (up to 1 µm2) and high yield (up to 10%) in less than 2-hrs using pure water (a common green solvent) as a medium and dual-frequency (20 kHz and 1 MHz) ultrasound configuration, which enables both physico-mechanical exfoliation and uniform dispersion. The mechanisms involved are studied using in-situ observations and acoustic pressure measurements. An optimum combination of ultrasonication parameters was identified and confirmed by structural characterisation of the end-product. Examples of practical implementation are given. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Process Technology, Nanotechnology, Characterization |