fig2
Figure 2. Schematics of the main “top-down” synthesis strategies of 2D nanosheets. (A) Micromechanical cleavage exfoliation[171]. Copyright 2012, Elsevier Ltd. (B) Ball milling shear-force exfoliation. (C) Sonication exfoliation[172]. Copyright 2018, Elsevier B.V. (D) Electrochemical (E-Chem) exfoliation[38]. Copyright 2018, Springer Nature. (E) Ion/molecule intercalation[173]. Copyright 2017, John Wiley & Sons, Inc. (F) Thermal oxidation etching[47]. Copyright 2021, John Wiley & Sons, Inc.
