State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, P. R. China.
University of Chinese Academy of Sciences , Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2017 Aug 2;9(30):25455-25464. doi: 10.1021/acsami.7b06835. Epub 2017 Jul 21.
Counterfeiting of valuable certificates, documents, and banknotes is a serious issue worldwide. As a result, the need for developing novel anticounterfeiting materials is greatly increasing. Herein, we report a new kind of ultralong hydroxyapatite nanowire (HAPNW)-based paper with luminescence, fire resistance, and waterproofness properties that may be exploited for anticounterfeiting applications. In this work, lanthanide-ion-doped HAPNWs (HAPNW:Ln) with lengths over 100 μm have been synthesized and used as a raw material to fabricating a free-standing luminescent, fire-resistant, water-proof paper through a simple vacuum filtration process. It is interesting to find that the luminescence intensity, structure, and morphology of HAPNW:Ln highly depend on the experimental conditions. The as-prepared HAPNW:Ln paper has a unique combination of properties, such as high flexibility, good processability, writing and printing abilities, luminescence, tunable emission color, waterproofness, and fire resistance. In addition, a well-designed pattern can be embedded in the paper that is invisible under ambient light but viewable as a luminescent color under ultraviolet light. Moreover, the HAPNW:Ln paper can be well-preserved without any damage after being burned by fire or soaked in water. The unique combination of luminescence, fire resistance, and waterproofness properties and the nanowire structure of the as-prepared HAPNW:Ln paper may be exploited toward developing a new kind of multimode anticounterfeiting technology for various high-level security antiforgery applications, such as in making forgery-proof documents, certificates, labels, and tags and in packaging.
伪造有价证书、文件和钞票是一个全球性的严重问题。因此，对开发新型防伪材料的需求正在大幅增加。在此，我们报告了一种新型的基于超长羟基磷灰石纳米线（HAPNW）的纸张，具有发光、防火和防水性能，可用于防伪应用。在这项工作中，我们合成了长度超过 100 μm 的掺镧离子的羟基磷灰石纳米线（HAPNW:Ln），并将其用作原料，通过简单的真空过滤工艺制备出一种具有自支撑发光、防火、防水性能的纸张。有趣的是，发现 HAPNW:Ln 的发光强度、结构和形态高度依赖于实验条件。所制备的 HAPNW:Ln 纸具有独特的性能组合，如高柔韧性、良好的可加工性、书写和打印能力、发光、可调发射颜色、防水性和防火性。此外，可以在纸张中嵌入一个精心设计的图案，在环境光下不可见，但在紫外光下可以看到发光颜色。而且，HAPNW:Ln 纸在被火燃烧或浸泡在水中后，可以完好无损地保存，没有任何损坏。所制备的 HAPNW:Ln 纸具有独特的发光、防火和防水性能以及纳米线结构，可能会被开发用于各种高级安全防伪应用的新型多模式防伪技术，例如用于制作防伪文件、证书、标签和标记以及包装。
