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Patterned and Iridescent Plastics with 3D Inverse Opal Structure for Anticounterfeiting of the Banknotes

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Indexed by:期刊论文

Date of Publication:2018-04-19

Journal:ADVANCED OPTICAL MATERIALS

Included Journals:SCIE、EI

Volume:6

Issue:8

ISSN No.:2195-1071

Key Words:anticounterfeiting; colored plastics; inverse opal; photonic crystals; structural color

Abstract:Iridescent and metallic structural colors originating from 3D photonic crystals (3DPCs) based on Bragg's law of diffraction have attracted considerable attention in recent years. The distinctive optical properties of the material promise tremendous potential in anticounterfeiting fields. However, the poor durability and device-assisted detection of 3DPCs still limit the material's practical application. To overcome these inherent limitations, a novel iridescent flexible polyvinylidene fluoride (PVDF) plastic film with a 3D inverse opal (3DIO) structure is prepared for the anticounterfeiting of banknotes. The excellent durability of the plastic film is due to the intrinsic robust properties of PVDF resin. Patterns can be easily printed on the plastic films by pressing method. The patterned colored PVDF film changes into six distinct color states when the viewing angle increases from 5 degrees to 45 degrees, and the color switching requires no external stimuli, which makes the plastic films a higher security-level material. Given their excellent mechanical properties, the colored films can serve as an ideal candidate for anticounterfeiting materials.

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