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SEM image of 2-D ZnO (a) nanodisks/nanoflakes. Reprinted with permission from [121]. Copyright 2014 American Chemistry Society. (b) Nanosheets. Reprinted by permission from Springer Nature, Journals of Materials Science: Materials in Electronics [122], Copyright 2015. (c) Nanowalls. Adapted by permission from John Wiley and Sons from Ref. [123]. Copyright 2012. (d) Nanoforest. Reprinted by permission from Springer Nature [124], Copyright 2018.
