Highly Flexible and Reversible Stimuli‐Responsive Photonic Crystal Film in Anti‐Counterfeit, Detector, and Coating

Author:

Jia Shengzhe1,Yang Bingbing1,Du Jing2,Zhang Jiayin1,Xie Yujiang1,Yu Liuyang1,Zhang Yuan1,Tao Tiantian1,Tang Weiwei13ORCID,Gong Junbo13

Affiliation:

1. State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

2. Department of Chemistry Institute of Molecular Aggregation Science Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin University Tianjin 300072 China

3. Collaborative Innovation Center of Chemistry Science and Engineering Tianjin 300072 China

Abstract

AbstractVarious fascinating optical characteristics in organisms encourage scientists to develop biomimetic synthesis strategies and mimic their unique microstructure. Inspired by the Chameleon's skin with tunable color and superior flexibility, this work designs the evaporated‐induced self‐assembly technique to synthesize the chiral photonic crystal film. Ultrasonic‐intensified and additive‐assisted techniques synergistically optimize the film properties, on the aspects of optic and mechanic. The film shows considerable rigidity and superior flexibility, which can undergo multiple mechanical deformations. Without destroying the chiral nematic structure, the ultimate strain approaches 50%, which exceeds most cellulose‐derived film materials. It also integrates excellent optical performance. The film color can cover the total visible region by tuning the photonic bandgap and has angle‐dependent properties. It can make the response to humidity and solvents, and chromaticity variation reflects the degree of stimulation. Importantly, this structural‐dependent color change is reversible. Lastly, the photonic crystal materials with excellent mechanics and unique optics have been applied in the security. The anti‐counterfeiting material design contains photonic crystal ink, repeatable writing paper, information‐hiding film, and color‐changing labels, with the features of environmentally friendly, economical, non‐destructive, and convenient for authentication.

Funder

National Natural Science Foundation of China

Major Scientific and Technological Innovation Project of Shandong Province

Publisher

Wiley

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