the exfoliated Graphite in Ethyl cellulose EC in ethanol dispersion forms a good dispersion in the liquid state but during drying at Room temperature (without heating) in air and recrystallization on precleaned glass slides, Accumulation of the graphene dark solid material appears at all the perimeter(edges) of the slides as in the attached photo. this accumulation prevent good coverage over all the film body and consequently gives low quality film uniformity and electrical properties. How can we drop cast dispersions of Gr/EC in ethanol without this coffee ring effect CRE ?
Instead of drop casting on the substrate after dispersing it in ethanol medium try brush coating. This can be easily done with a paintbrush with minimum brush size and paint it over the glass substrate evenly. This further reduces the surface resistance of the material.
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