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The production of structural colors based on graphene oxide (GO) pseudo‐one‐dimensional photonic crystals (p1D‐PhCs) in the visible spectrum is reported on page 3433 by W. Qi and co‐workers. The structural colors could be tuned by simply changing either the volume or concentration of the aqueous GO dispersion. Moreover, GO p1D‐PhCs exhibit visible and rapid responsiveness to humidity.
It is broadly observed that graphene oxide (GO) films appear transparent with a thickness of about several nanometers, whereas they appear dark brown or almost black with thickness of more than 1 μm. The basic color mechanism of GO film on a sub‐micrometer scale, however, is not well understood. This study reports on GO pseudo‐1D photonic crystals (p1D‐PhCs) exhibiting tunable structural colors in...
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