Facile fabrication of encryption composite materials with trilayer quasi-amorphous heterostructure

简便制备具有三层准晶异质结构的加密复合材料

Encryption materials represent a major direction of information security,but it is challenging to realize the ideal security combining the complete hiding of complex coding,stability in transmission,camouflage,and reliable decoding.Herein,we report an innovative strategy for rationally constructing encryption composite materials with high security and portability.Compared with common colloidal photonic watermarks,our encrypted optical devices are composed of thermoplastic polyurethanes(TPU)protective layers,polystyrene(PS)switching layers and a Cd S coding layer.The optical shielding properties and phase state transition of PS layers enable high-level encoding and decoding security through thermal activation of light transmittance control.Meanwhile,the Cd S layer can be clearly revealed in decoding mode because of the high refractive index.Besides,the confinement protection of integrated TPU films prevents the trilayer quasi-amorphous heterostructure from damage.To establish the practical advantage,portable information carriers can be prepared for camouflage.Accordingly,the reliable encoding and decoding system,and ability to integrate with easy-to-carry products,make our composites a potentially high-security encryption device for anti-fraud technology.

加密材料是信息安全领域的一个主要研究方向,然而将复杂编码的完全隐藏、传输过程中的稳定性、伪装性和可靠的解码方法相结合来实现理想的信息安全,仍具有挑战性.本文报道了一种创新策略,用于合理构建具有高安全性和便携性的加密复合材料.与普通的胶体光子水印相比,这种加密光学器件由热塑性聚氨酯(TPU)保护层、聚苯乙烯(PS)转换层和CdS编码层组成.通过热激活的透光率控制,PS层的光屏蔽作用和相态转变使复合材料具有高级别的编解码安全性.同时,由于高折射率,CdS层在解码模式下可以清晰地显示出来.此外,TPU膜的限域保护能够有效防止三层准晶异质结构的破损.为了建立实际应用优势,可以制备便携式信息载体进行伪装.因此,可靠的编解码体系以及与便携性载体相结合的能力,使这种高安全性加密器件具有应用于反欺诈领域的潜力.