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Hollow silica opals/cellulose acetate nanocomposite films with structural color for anti-counterfeiting of banknotes

Abstract

Utilizing biomass materials to construct photonic bandgap materials has attracted increasing attention due to their ecological friendliness. In this work, we introduced biodegradable cellulose acetate to the interstice of hollow silica 3D PCs for building hollow silica opals/cellulose acetate nanocomposite films. In the films, the hollow silica 3D PCs offered well-ordered arrays for producing structural colors. Cellulose acetate with excellent film forming ability served as the matrix endowing the PCs framework mechanical stability, including flexibility, robust tensile strength and ability of repetitive bending. The prepared colored composite films possessed high transparency and can work as anti-counterfeiting labels for banknotes when patterned by a facile mask method. Compared with other reported PCs that are responsive to external stimuli in the field of anti-counterfeiting, the film has advantage in quick color-transparency switch just by changing viewing angle. Except for application in security materials, the colored composite films also displayed potential as package materials for their biodegradability

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Supplementary files

Publication details

The article was received on 13 Apr 2019, accepted on 14 May 2019 and first published on 16 May 2019


Article type: Paper
DOI: 10.1039/C9TC01992H
J. Mater. Chem. C, 2019, Accepted Manuscript

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    Hollow silica opals/cellulose acetate nanocomposite films with structural color for anti-counterfeiting of banknotes

    L. Chu, X. Zhang, W. Niu, S. Wu, W. Ma, B. Tang and S. Zhang, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC01992H

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