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Lookup NU author(s): Dr Shayan SeyedinORCiD,
Professor Lidija Siller,
Dr Nick Coleman
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The scalable production of two-dimensional (2D) materials is needed to accelerate their adoption to industry. In this work, we present a low-cost in-line and enclosed process of exfoliation based on high-shear mixing to create aqueous dispersions of few-layer graphene, on a large scale with a Yw ~ 100% yield by weight and throughput of ϕ ~ 8.3 g hr-1. The in-line process minimises basal plane defects compared to traditional beaker-based shear mixing which we attribute to a reduced Reynolds number, Re ~ 105. We demonstrate highly conductive graphene material with conductivities as high as σ ∼ 1.5 × 104 S m-1 leading to sheet-resistances as low as Rs ∼ 2.6 Ω □-1 (t ∼ 25 μm). The process is ideal for formulating non-toxic, biocompatible and highly concentrated (c ∼ 100 mg ml-1) inks. We utilise the graphene inks for inkjet printable conductive interconnects and lithium-ion battery anode composites that demonstrate a low-rate lithium storage capability of 370 mAh g-1, close to the theoretical capacity of graphite. Finally, we demonstrate the biocompatibility of the graphene inks with human colon cells and human umbilical vein endothelial cells at high c ∼ 1 mg ml-1 facilitating a route for the use of the graphene inks in applications that require biocompatibility at high c such as electronic textiles.
Author(s): Carey T, Alhourani A, Tian R, Seyedin S, Arbab A, Maughan M, Siller L, Horvath D, Kelly A, Kaur H, Caffrey E, Kim JM, Hagland HR, Coleman JN
Publication type: Article
Publication status: Published
Journal: npj 2D Materials and Applications
Online publication date: 12/01/2021
Acceptance date: 01/12/2021
Date deposited: 11/01/2022
ISSN (electronic): 2397-7132
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