Mechanochromic and thermochromic shape memory photonic crystal films based on core/shell nanoparticles for smart monitoring

Shape memory photonic crystals (SMPCs) combining the main characteristics of shape memory materials and photonic crystals have drawn increasing research interest. In sharp contrast to traditional responsive photonic crystals, the temporary shape of SMPCs can be "frozen" and photonic config...

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Bibliographic Details
Published in:Nanoscale 2019-11, Vol.11 (42), p.215-223
Main Authors: Wu, Pan, Shen, Xiuqing, Schäfer, Christian G, Pan, Jian, Guo, Jia, Wang, Changchun
Format: Article
Language:English
Subjects:
Biodegradable materials
Color
Core-shell particles
Crystals
Glass fiber reinforced plastics
Glass transition temperature
Monitoring
Nanoparticles
Optical properties
Photocuring
Photonic crystals
Polymer films
Polymers
Reflection
Shape memory
Smart sensors
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Summary:Shape memory photonic crystals (SMPCs) combining the main characteristics of shape memory materials and photonic crystals have drawn increasing research interest. In sharp contrast to traditional responsive photonic crystals, the temporary shape of SMPCs can be "frozen" and photonic configurations can be modulated by temperature. However, the large-scale fabrication of SMPCs still remains a big challenge, making the practical application difficult. Herein novel scalable SMPC films with both mechanochromic and thermochromic properties are reported. Unlike traditional template-based methods resulting in only a small size, SMPC films are fabricated by a facile hot-pressing method and post-photocuring technology to give large-area freestanding polymer films. The films are mechanically robust and flexible, featuring an excellent structural color which can be changed upon stretching, similar to the color change process of chameleons in response to the environment. The blue-shift of the reflection peak up to 120 nm can be observed when the film is stretched. The films can be reversibly stretched and recovered in 25 cycles without obvious changes in reflection spectra. The temporary shape accompanied by tremendous color changes in the corresponding SMPC films after mechanical stress induced hot programming could be simply fixed by cooling the structure below the glass transition temperature of the polymer matrix. Incorporated programmed optical properties could afterwards be erased by temperature, and initial optical properties could be fully restored. Based on the fully reversible programmable shape as well as optical properties, the investigated SMPC films are expected to be promising candidates for various potential applications, such as smart monitoring, sensors, anti-counterfeiting, and displays. A new fabrication strategy was developed for the preparation of scalable SMPC films based on core/shell nanoparticles with shape and color change on a macroscopic scale for environmental monitoring.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr05361a