Dual-responsive PU inverse photonic crystal film with high flexibility for anti-counterfeiting†

IF 5.1 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xin Zhang, Ziyuan Zhang and Fuchang Yu
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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.

Abstract Image

双响应PU逆光子晶体膜,高柔性防伪†
响应性光子晶体在外界刺激下可以改变其颜色,在比色传感、检测和防伪等领域受到广泛关注。特别是具有大孔结构的逆光子晶体(IPC)有利于外部刺激的传输。本文以SiO2为模板,采用HF刻蚀工艺制备了具有双响应特性的PU-IPC逆光子晶体膜。与在刺激下具有可逆体积膨胀或收缩特性的传统水凝胶IPC膜相比,PU大孔结构在不同浓度乙醇浸泡后呈现出不同的颜色变化,从崩溃状态逐步恢复到有序状态。具有高柔韧性的PU-IPC薄膜在乙醇中预浸泡一段时间后,表现出优异的机械变色性能。利用双响应特性,通过选择性蚀刻或掩膜法制备了精美的图案,在不同浓度的乙醇中显示出动态的颜色。这种双响应PU-IPC薄膜在防伪方面具有很大的应用潜力。
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来源期刊
Journal of Materials Chemistry C
Journal of Materials Chemistry C MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED
CiteScore
10.80
自引率
6.20%
发文量
1468
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
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