{"title":"Dual-responsive PU inverse photonic crystal film with high flexibility for anti-counterfeiting†","authors":"Xin Zhang, Ziyuan Zhang and Fuchang Yu","doi":"10.1039/D3TC02444J","DOIUrl":null,"url":null,"abstract":"<p >Responsive photonic crystals that can change their color under external stimuli have received extensive attention in colorimetric sensing, detection and anti-counterfeiting. In particular, the inverse photonic crystal (IPC) with a macroporous structure is beneficial for the transmission of external stimuli. Herein, inverse photonic crystal films of polyurethane (PU-IPC) with dual responsive character were fabricated by using SiO<small><sub>2</sub></small> particles as template followed by a HF etching process. Compared with the conventional hydrogel based IPC films with a reversible volume swelling or shrinking character under stimuli, the PU macro-porous structure shows varied color changes upon soaking in ethanol with different concentrations owing to the stepwise recovery from a collapsed state to an ordered state. Moreover, the PU-IPC film with high flexibility shows excellent mechanochromic property when pre-soaked in ethanol for a while. Based on the dual responsive character, exquisite patterns were fabricated by selective etching or mask methods on it, which could display dynamic colors in ethanol with different concentrations. This dual responsive PU-IPC film has great potential applications in anticounterfeiting.</p>","PeriodicalId":84,"journal":{"name":"Journal of Materials Chemistry C","volume":" 35","pages":" 11936-11942"},"PeriodicalIF":5.1000,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry C","FirstCategoryId":"1","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2023/tc/d3tc02444j","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Responsive photonic crystals that can change their color under external stimuli have received extensive attention in colorimetric sensing, detection and anti-counterfeiting. In particular, the inverse photonic crystal (IPC) with a macroporous structure is beneficial for the transmission of external stimuli. Herein, inverse photonic crystal films of polyurethane (PU-IPC) with dual responsive character were fabricated by using SiO2 particles as template followed by a HF etching process. Compared with the conventional hydrogel based IPC films with a reversible volume swelling or shrinking character under stimuli, the PU macro-porous structure shows varied color changes upon soaking in ethanol with different concentrations owing to the stepwise recovery from a collapsed state to an ordered state. Moreover, the PU-IPC film with high flexibility shows excellent mechanochromic property when pre-soaked in ethanol for a while. Based on the dual responsive character, exquisite patterns were fabricated by selective etching or mask methods on it, which could display dynamic colors in ethanol with different concentrations. This dual responsive PU-IPC film has great potential applications in anticounterfeiting.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors