fig3
![Constructing and regulating nanochannels in two-dimensional-material-based membranes for specified separation applications](https://image.oaes.cc/446c37a5-4869-4f7c-9f84-91d9fd640458/microstructures3011.fig.3.jpg)
Figure 3. Schematics of the main “bottom-up” synthesis strategies of 2D nanosheets. (A) Chemical vapor deposition[174]. Copyright 2017, Springer Nature. (B) Physical vapor deposition[47]. Copyright 2021, John Wiley & Sons, Inc. (C) Wet-chemical synthesis[175]. Copyright 2021, American Chemical Society.