Anti-counterfeiting labels of photonic crystals with versatile structural colors†

IF 4.6 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Nguyen Hoang Minh, Kwanoh Kim, Do Hyun Kang, Yeong-Eun Yoo and Jae Sung Yoon
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Abstract

Labels with structural color based on photonic crystals (PCs) have drawn significant attention due to their unique color emission, offering promising solutions for anti-counterfeiting applications. However, to meet the demands of future high-security applications, conventional structural color labels require further improvement. This study introduces a novel approach to fabricate highly encrypted anti-counterfeiting labels by combining close-packed and non-close-packed monolayers of nanoparticles (NPs) onto adhesive surfaces. The photonic crystals, arranged in specific geometric shapes, exhibit overt–covert characteristics. The hidden label is only revealed under specific external triggers, such as attaching or removing a transparent cover film. The principle of color modulation of the photonic crystal is elucidated, highlighting the role of packing density and refractive index matching. Additionally, the scalability and cost-effectiveness of the fabrication process in this study are expected to facilitate future commercialization. Various anti-counterfeiting applications, including water-responsive labels and multi-layer authentication, are demonstrated also, which enables higher security levels and versatility of this study.

Abstract Image

具有多种结构颜色的光子晶体防伪标签。
基于光子晶体(PC)的结构色标签因其独特的颜色发射而备受关注,为防伪应用提供了前景广阔的解决方案。然而,为了满足未来高安全性应用的需求,传统的结构色标签需要进一步改进。本研究介绍了一种在粘合剂表面结合紧密堆积和非紧密堆积纳米粒子(NPs)单层来制造高度加密防伪标签的新方法。以特定几何形状排列的光子晶体表现出明显的隐蔽特性。只有在特定的外部触发条件下,如贴上或撕下透明覆盖膜,隐藏的标签才会显现出来。光子晶体的颜色调制原理得到了阐明,突出了堆积密度和折射率匹配的作用。此外,本研究中的制造工艺具有可扩展性和成本效益,有望促进未来的商业化。本研究还展示了各种防伪应用,包括水响应标签和多层验证,从而提高了本研究的防伪水平和多功能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nanoscale Advances
Nanoscale Advances Multiple-
CiteScore
8.00
自引率
2.10%
发文量
461
审稿时长
9 weeks
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