Exfoliation of 2D materials by high shear mixing

Sonia Biccai, Sebastian Barwich, Daniel Boland, Andrey Harvey, Damien Hanlon, Niall McEvoy, Jonathan N Coleman
2018 2D Materials  
colemaj@tcd.ie (Jonathan N. Coleman); Tel: +353 (0) 1 8963859. Abstract: While it has been demonstrated that large scale liquid exfoliation of graphene is possible using high-shear exfoliation, it has not yet been shown to be applicable to a broader range of layered materials. In addition, it would be useful to determine whether the mechanisms reported for shear exfoliation of graphene also apply to other 2D materials. In this work we show that previous models describing high-shear exfoliation
more » ... -shear exfoliation of graphene apply to MoS2 and WS2. However, we find the minimum shear rate required to exfoliate MoS2 and WS2 to be ~310 4 s -1 , somewhat higher than the value for graphene. We also demonstrate the scalability of shear exfoliation of WS2. By measuring and then optimising the scaling parameters, shear exfoliation of WS2 is shown to be capable of reaching concentrations of 1.82 g/L in 6 hours and demonstrating a maximum production rate of 0.95 g/hour.
doi:10.1088/2053-1583/aae7e3 fatcat:iw6fktxi4vgqlobt627sryh3uq