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Examples of top-down and bottom-up strategies for the synthesis of 2D layered nanostructures: (a) mechanical exfoliation of layered host materials, (b) chemical intercalation induced exfoliation, (c) chemical vapor deposition (CVD) growth, and (d) wet-chemical self-assembly. Scanning electron microscopy (SEM) images of 2D nanomaterials obtained with the corresponding techniques: (e,g,h) TiO2 and (f) VO2 nanosheets.
