Figure 1.
Illustration of liquid exfoliation, size selection, and solvent transfer. (a) Schematic of the tip sonication. (b) Schematic of the liquid cascade centrifugation. Relative centrifugal forces of (RCFs) 5k g, 10k g, and 30k g are used. The supernatant after each step is transferred to another centrifugation at higher centrifugal acceleration, while the sediments are collected. (c) Schematic of the dispersion solvent exchange, transferring from H2O to IPA. 30k g RCF is used to spin-down the WS2 nanosheets as a pellet allowing for solvent exchange. 2k g RCF is used to remove aggregated nanosheets as sediments.