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. Author manuscript; available in PMC: 2019 May 13.
Published in final edited form as: Adv Electron Mater. 2018;4:10.1002/aelm.201700593. doi: 10.1002/aelm.201700593

Figure 1.

Figure 1.

(a) Schematic showing the hierarchical structure of a tree. (b–c) Schematic illustrating structure of (b) a regular paper and (c) TEMPO-oxidized wood fibers and the corresponding chemical structures of the constituent cellulose. Reproduced with permission.[36] Copyright 2013, American Chemical Society. (d) SEM images of a regular paper and TEMPO-oxidized transparent paper. The transparent paper shows fewer porous air cavities and thus higher packing density of cellulose fibers than the regular paper, resulting in high transmission.