Microfluidization of graphite and formulation of graphene-based conductive inks
P. G. Karagiannidis, S. A. Hodge, L. Lombardi, F. Tomarchio, N., Decorde, S. Milana, I. Goykhman, Y. Su, S. V. Mesite, D. N. Johnstone, R. K., Leary, P. A. Midgley, N. M. Pugno, F. Torrisi, A. C. Ferrari
TL;DR
This paper presents a scalable method for exfoliating graphite into graphene using high shear flow, producing stable conductive inks with low sheet resistance suitable for flexible electronics.
Contribution
A novel high shear rate exfoliation process achieving 100% yield and stable, printable graphene inks without centrifugation.
Findings
Exfoliation yield of 100% under turbulent flow conditions
Stable inks at concentrations up to 100 g/L
Sheet resistance below 2 ohms per square
Abstract
We report the exfoliation of graphite in aqueous solutions under high shear rate [] turbulent flow conditions, with a 100\% exfoliation yield. The material is stabilized without centrifugation at concentrations up to 100 g/L using carboxymethylcellulose sodium salt to formulate conductive printable inks. The sheet resistance of blade coated films is below. This is a simple and scalable production route for graphene-based conductive inks for large area printing in flexible electronics.
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