A rewritable photonic crystal (PC)
paper as an environmentally
friendly and low-resource-consuming material for information storage
and spreading has gradually become a research hotspot. In this work,
a novel rewritable PC paper with inkless writing and double-sided
rewritability properties was developed. A double-sided epoxy resin
PC paper exhibiting an inverse opal structure and a bright structural
color was fabricated using the sacrificial template method. Carbon
black was doped into the material to increase color saturation and
purity while preventing light transmission and protecting the double-sided
structural color from interference. The force of sliding friction
and deformation triggered by capillary pressure as well as swelling-triggered
recovery of the inverse opal structure led to an easy rewriting of
the PC paper. The PC paper exhibited excellent rewritability even
after 50 runs of the rewriting process. Given the inkless and double-sided
rewriting, this study provides a new method for the preparation of
rewritable PC papers.
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