Abstract
In order to improve the luminescent stability of water-based anti-counterfeit ink, a new fluorescent material is prepared by doping dye into silica nanoparticles. Water soluble anionic dye 1, 3, 6, 8-pyrenesulfonic acid sodium salt (PTSA) is selected as the dopant. In this work, PTSA is successfully trapped into silica nanoparticles (SiNPs) by the reverse microemulsion method using cationic polyelectrolyte poly (dimethyl diallyl ammonium chloride; PDADMAC) as a bridge. The UV absorption spectra, fluorescence emission spectra and fluorescent decay curves are used to describe the luminescent properties of the PTSA-doped silica nanoparticles (PTSA-SiNPs). In addition, the as-prepared PTSA-SiNPs and polyurethane waterborne emulsion are used to prepare water-based anti-counterfeit ink, and fluorescent patterns are successfully printed through screen-printing. The samples printed by the ink exhibit desirable fluorescence properties, heat stability, robust photostability, and a fluorescent anti-counterfeit effect, which makes the PTSA-SiNPs promising luminescent materials for anti-counterfeit applications.
Highlights
In modern anti-counterfeit printing technology, fluorescent anti-counterfeit ink is widely used in the anti-counterfeit of commercial bills, high-grade commodity packaging and labels because of its convenience in verification and prevention of forgery [1,2]
pyrenesulfonic acid tetrasodium salt (PTSA)-silica nanoparticles (SiNPs) are successfully prepared by the reverse microemulsion method using
PTSA-SiNPs are successfully prepared by the reverse microemulsion method using cationic polymer PDADMAC as a bridge
Summary
In modern anti-counterfeit printing technology, fluorescent anti-counterfeit ink is widely used in the anti-counterfeit of commercial bills, high-grade commodity packaging and labels because of its convenience in verification and prevention of forgery [1,2]. Some effective research has been achieved by using dye-doped silica nanoparticle (SiNP) material in water-soluble anti-counterfeit ink [15,16]. The reverse microemulsion system is a water/oil type microemulsion, which is composed of an oil-continuous phase, a water-dispersed phase, a surfactant and a cosurfactant It is very suitable for preparing water-soluble dye-doped SiNPs. The water is surrounded by the interface composed of the surfactant and cosurfactant, and it forms a 10–100 nm nanoscale space with uniform size. The as-prepared PTSA-SiNPs are applied in the formulation of water-based fluorescent anti-counterfeit ink. The samples printed by the ink have a good anti-counterfeit effect and fluorescence stability, and, notably, they show excellent light resistance and heat resistance, providing a potential and high-quality blue fluorescent material for application in water-based ink
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