Hu Songnan, Yue Fengxia, Peng Fang, Zhou Xin, Chen Yian, Song Tao, Qi Haisong
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China.
Carbohydr Polym. 2024 Sep 15;340:122315. doi: 10.1016/j.carbpol.2024.122315. Epub 2024 May 25.
Utilizing advanced multiple channels for information encryption offers a powerful strategy to achieve high-capacity and highly secure data protection. Cellulose nanocrystals (CNCs) offer a sustainable resource for developing information protection materials. In this study, we present an approach that is easy to implement and adapt for the covalent attachment of various fluorescence molecules onto the surface of CNCs using the Mannich reaction in aqueous-based medium. Through the use of the Mannich reaction-based surface modification technique, we successfully achieved multi-color fluorescence in the resulting CNCs. The resulting CNC derivatives were thoroughly characterized by two dimensional heteronuclear single quantum coherence nuclear magnetic resonance (2D HSQC NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron (XPS) spectroscopy. Notably, the optical properties of CNCs were well maintained after modification, resulting in films exhibiting blue and red structural colors. This enables the engineering of highly programmable and securely encoded anti-counterfeit labels. Moreover, subsequent coating of the modified CNCs with MXene yielded a highly secure encrypted matrix, offering advanced security and encryption capabilities under ultraviolet, visible, and near-infrared wavelengths. This CNC surface-modification enables the development of multimodal security labels with potential applications across various practical scenarios.
利用先进的多通道进行信息加密提供了一种强大的策略，以实现高容量和高度安全的数据保护。纤维素纳米晶体（CNC）为开发信息保护材料提供了一种可持续的资源。在本研究中，我们提出了一种易于实施和适应的方法，用于在水基介质中使用曼尼希反应将各种荧光分子共价连接到CNC表面。通过使用基于曼尼希反应的表面改性技术，我们在所得的CNC中成功实现了多色荧光。所得的CNC衍生物通过二维异核单量子相干核磁共振（2D HSQC NMR）光谱、傅里叶变换红外（FT-IR）光谱和X射线光电子能谱（XPS）进行了全面表征。值得注意的是，改性后CNC的光学性质得到了很好的保持，从而使薄膜呈现出蓝色和红色结构色。这使得能够设计出高度可编程和安全编码的防伪标签。此外，随后用MXene对改性后的CNC进行涂层，得到了一个高度安全的加密矩阵，在紫外、可见和近红外波长下具有先进的安全和加密能力。这种CNC表面改性能够开发出具有多模态安全标签，在各种实际场景中具有潜在应用。
