Cheng Hongrui, Wei Xiaofeng, Qiu Haijiang, Wang Wensong, Su Wenyue, Zheng Yuanhui
College of Chemistry, Fuzhou University Fuzhou 350116 China
National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University Fuzhou 350002 PR China.
RSC Adv. 2021 May 21;11(30):18381-18386. doi: 10.1039/d1ra02089g. eCollection 2021 May 19.
Carbon-based fluorescent security labels are effective methods to prevent counterfeiting. However, the properties of poor optical stability, complex and energy-consuming synthesis processes and weak bonding with substrates of carbon-based fluorescent materials limit their application prospects. Here, a novel fluorescent patterning strategy is developed to achieve covert, chemically stable and solvent-tolerant cellulose-based security labels by UV exposure. The unsaturated double bonds as the origin of the fluorescence were generated during the photodegradation process under UV exposure. The fluorescent emission of cellulose-based materials reveals excellent stability under acidic, alkaline, reducing, oxidizing and non-polar solvent environments. These advantages give the cellulose nanofiber based security label fantastic potential applications.
碳基荧光防伪标签是防止假冒的有效方法。然而，碳基荧光材料存在光学稳定性差、合成过程复杂且耗能以及与基材结合力弱等特性，限制了它们的应用前景。在此，开发了一种新颖的荧光图案化策略，通过紫外线曝光实现隐蔽、化学稳定且耐溶剂的纤维素基防伪标签。在紫外线曝光下的光降解过程中产生了作为荧光来源的不饱和双键。纤维素基材料的荧光发射在酸性、碱性、还原、氧化和非极性溶剂环境下显示出优异的稳定性。这些优点赋予了纤维素纳米纤维基防伪标签巨大的潜在应用价值。
