Abstract
In order to prevent counterfeiting of down fiber from consumers, rare earth fluorescent materials are developed in the field of material identification and anticounterfeiting. Herein, the development of verifiable down fiber based on infrared excitation‐infrared emission was described. A novel method was approached to prepare security down fiber, which involved modification of down‐conversion nanoparticles (DCNPs) by sulfonic groups and self‐assembly onto down fiber through electrostatic force. DCNPs were successfully prepared from ytterbium‐deposited NaYF4 nanoparticles using a complexation precipitation approach, in which the trivalent ytterbium ions served as the luminescent center. Sulfonic down‐conversion nanoparticles (SO3‐SiO2@DCNPs) were fabricated by the hydrolysis of 3‐mercaptopropyl triethoxysilane (MPTES) and next oxidation to enhance the combination of the DCNPs with down fiber. The synthesis of DCNPs and SO3‐SiO2@DCNPs and its pendant to down were confirmed by XRD, SEM, XPS, FT‐IR, Zeta potential meter, and PL, which revealed the presence of DCNPs in the size average 86 nm. The obtained DCNPs and security down fiber were launching an invisible red‐shifted emission of 930∼1080 nm (corresponding to the 2F5/2 ⟶ 2F7/2 transitions in Yb3+). After washing, the infrared emission of security down fiber was evaluated and proved to be effective with fine results, which showed its potential application in the field of security.
Highlights
Counterfeit product throws a growing threat to both producers and customers, as it leads to revenue loss and market chaos [1]
Visible emission facilitates the identification of counterfeit by naked eye, it exposes the protocol of tracked materials during the checking process that involves a risk for deteriorating the security level of Advances in Materials Science and Engineering anticounterfeiting [3]
X-ray photoelectron spectroscopy (XPS) was carried out using ermo Fisher Escalab 250Xi with the Al Kα radiation. e morphology and size distribution of as-prepared products were examined by transmission electron microscopy (TEM) using a JEM-2100 electron microscope operating at 200 kV. e surface charges of down fiber previously ground into powder and SO3-SiO2@down-conversion nanoparticles (DCNPs) were studied at different pH levels by Zeta potential analysis using a Malvern Zetasizer Nano
Summary
In order to prevent counterfeiting of down fiber from consumers, rare earth fluorescent materials are developed in the field of material identification and anticounterfeiting. The development of verifiable down fiber based on infrared excitationinfrared emission was described. A novel method was approached to prepare security down fiber, which involved modification of down-conversion nanoparticles (DCNPs) by sulfonic groups and self-assembly onto down fiber through electrostatic force. Sulfonic down-conversion nanoparticles (SO3-SiO2@ DCNPs) were fabricated by the hydrolysis of 3-mercaptopropyl triethoxysilane (MPTES) and oxidation to enhance the combination of the DCNPs with down fiber. E obtained DCNPs and security down fiber were launching an invisible red-shifted emission of 930∼1080 nm (corresponding to the 2F5/2 ⟶ 2F7/2 transitions in Yb3+). The infrared emission of security down fiber was evaluated and proved to be effective with fine results, which showed its potential application in the field of security
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