Exfoliation of 2D materials by high shear mixing

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 of graphene apply to MoS 2 and WS 2 . However, we find the minimum shear rate required to exfoliate MoS 2 and WS 2 to be ~3 × 10 4 s −1 , somewhat higher than the value for graphene. We also demonstrate the scalability of shear exfoliation of WS 2 . By measuring and then optimising the scaling parameters, shear exfoliation of WS 2 is shown to be capable of reaching concentrations of 1.82 g l −1 in 6 h and demonstrating a maximum production rate of 0.95 g h −1 .