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Thermal-Responsive Photonic Crystal with Function of Color Switch Based on Thermochromic System
journal contribution
posted on 2019-10-08, 12:36 authored by Fangfang Liu, Shufen Zhang, Xin Jin, Wentao Wang, Bingtao TangResponsive
photonic crystals have attracted considerable attention. The responsiveness
is usually achieved through the variation of reflection wavelengths
based on Bragg diffraction. However, distinguishing external stimuli
from intrinsic angle dependence is a challenge. Herein, a novel thermal-responsive
photonic crystal was constructed based on the synergistic effect of
the low-angle dependence of SnO2 inverse opals and a thermochromic
phase change system. The organic thermochromic phase change system
was obtained by mixing the fluoran dye (heat-sensitive red TF-R2), bisphenol A, and aliphatic alcohols in a certain proportion.
By filling the thermochromic phase change system into SnO2 inverse opals, the thermal-responsive photonic crystal was fabricated.
Through simple external thermal stimulation, the mutual transformation
of low-angle-dependent structural color and pigmentary color is realized
and inverse opal patterns can be displayed and hidden. The proposed
system, while preventing the interference of the observation angle
to the thermal stimulation, shows potential application prospect in
the fields of anti-counterfeiting and information encryption fields.