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Ultrathin transparent MoO3 nanobelts nanopaper. a) SEM image of ultrathin transparent MoO3 nanobelts nanopaper. b) Side view of transparent MoO3 nanopaper. c) Transmittance spectra of MoO3 nanopapers with different mass loading. d) Optical images of transparent MoO3 nanopaper under different times of folding: Original, one folding, two folding, three folding, four folding, and full recovery. Reproduced with permission.13
