Bifunctional magnetic-upconverting luminescent cellulose fibers for anticounterfeiting purposes

• Published in: Journal of alloys and compounds Vol. 829; p. 154456
• Main Authors: Skwierczyńska, Małgorzata, Woźny, Przemysław, Runowski, Marcin, Perzanowski, Marcin, Kulpiński, Piotr, Lis, Stefan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.07.2020; Elsevier BV
• Subjects: Cellulose fibers; Continuous improvement; Core/shell nanomaterials; Counterfeiting; Documents and textiles protection; Fluorides; Lanthanide(III) ions; Luminescence & magnetism; Magnetic properties; Mechanical properties; Multifunctional nanoparticles; Nanoparticles; Textiles; Documents and textiles protection; Luminescence & magnetism; Lanthanide(III) ions; Core/shell nanomaterials; Multifunctional nanoparticles
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.154456

Counterfeiting of valuable documents, currency and branded products is a growing problem that has serious economic and security implications for governments and companies, as well as for ordinary people/customers. In order to prevent and detect falsification, continuous improvement of anticounterfeiting technology is required. This article presents the fabrication process and properties of the luminescent (upconverting)-magnetic cellulose fibers and their application in textiles. For the first time such functionalized fibers and corresponding luminescent-magnetic textiles are prepared. Cellulose fibers with bifunctional properties were obtained by core/shell type nanostructures based on lanthanide doped fluorides and magnetite nanoparticles. They show a bright red emission under the NIR excitation and magnetic response, along with very good mechanical properties. The fabric with upconverting-magnetic properties made of the as-prepared fibers is a perfect example of advanced, multimodal protection of materials such as textiles and documents against counterfeiting. [Display omitted] •The novel, upconverting-magnetic cellulose fibers were prepared.•The synthesized bi-functional fibers were modified with core/shell nanostructures.•The modified cellulose fibers were obtained by the NMMO method.•Under NIR irradiation the modified fibers exhibited bright, red emission.•The functionalized fibers responded to the applied external magnetic field.