Department of Chemistry, College of Science, University of Tabuk, 71474 Tabuk, Saudi Arabia.
Department of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia.
Int J Biol Macromol. 2023 May 31;238:124028. doi: 10.1016/j.ijbiomac.2023.124028. Epub 2023 Mar 15.
Fluorescent inks have been emerged as a desirable encoding technique to enhance anticounterfeiting printing of commercial goods. However, significant drawbacks with fluorescent inks, such as poor durability, low efficiency, and high cost. Herein, we describe the preparation of a self-healing authentication ink based on carboxymethyl cellulose (CMC) hydrogel immobilized with nitrogen-doped carbon dots (NCD) nanoparticles (NPs) for cutting-edge anticounterfeiting applications. Security inks that self-heal are very durable. Under ambient conditions, the prepared NCD@CMC hydrogel could self-heal with a high healing efficiency. It might stick to diverse surfaces such as plastic, glass and paper sheets. The self-healing composite ink demonstrated outstanding photostability under UV light. Straightforward and environmentally friendly method was applied on the agricultural waste of rice straw toward the production of NCD using hydrothermal carbonization in an aqueous medium, and in the presence of NHOH as an inexpensive passivating agent. The quantum yield (QY) for NCD reached 24.09 %. Various concentrations of NCD NPs were employed to produce self-healable nanocomposite inks with a variety of emission properties. Stamping homogeneous films onto paper surfaces produced a transparent layer. The CIE Lab and emission spectra of prints independently verified the capability of NCD nanocomposite inks to vary their color to blue under UV illumination. To measure the particle diameter of the prepared NCD, their morphological characteristics were examined by transmission electron microscopy (TEM) to indicate diameters of 10-25 nm. Utilizing various analytical techniques, the morphology and chemical composition of the fluorescent prints were examined. We examined the mechanical qualities of the stamped papers as well as the rheological characteristics of the ink hydrogel. Due to their colorless appearance, the excitation band of the printed films was peaked at 364 nm, while their emission was peaked at 465 nm. The current smart ink holds high potential for numerous applications like smart packaging and authentication, and shows great promise as a practical and mass production approach for easily creating anticounterfeiting stamps.
荧光油墨作为一种增强商业商品防伪印刷的理想编码技术已经出现。然而，荧光油墨存在显著的缺点，如耐久性差、效率低和成本高。在此，我们描述了一种基于羧甲基纤维素（CMC）水凝胶固定氮掺杂碳点（NCD）纳米粒子（NPs）的自修复认证油墨的制备，用于尖端防伪应用。自修复的安全油墨非常耐用。在环境条件下，制备的 NCD@CMC 水凝胶可以以高修复效率自修复。它可以附着在各种表面上，如塑料、玻璃和纸张。自修复复合油墨在紫外光下表现出优异的光稳定性。采用简单、环保的方法，以水稻秸秆农业废弃物为原料，在水介质中通过水热碳化法制备 NCD，以 NHOH 为廉价的钝化剂，制备 NCD。NCD 的量子产率（QY）达到 24.09%。采用不同浓度的 NCD NPs 制备了具有不同发射性能的自修复纳米复合材料油墨。将均匀的薄膜压印到纸张表面，形成透明层。CIE Lab 和打印光谱独立验证了 NCD 纳米复合材料油墨在紫外光照射下能够将颜色变为蓝色的能力。为了测量制备的 NCD 的粒径，通过透射电子显微镜（TEM）观察其形态特征，表明粒径为 10-25nm。利用各种分析技术，对荧光打印的形态和化学成分进行了研究。我们还研究了印花纸张的机械性能以及油墨水凝胶的流变特性。由于打印膜的无色外观，其激发带在 364nm 处峰值，发射带在 465nm 处峰值。当前的智能油墨具有广泛的应用潜力，如智能包装和认证，并显示出作为一种实用和大规模生产方法的巨大潜力，可轻松创建防伪印章。
