title: Screen-printed nanoparticles as anti-counterfeiting tags.
abstract: Metallic nanoparticles with different physical properties have been screen printed as authentication tags on different types of paper. Gold and silver nanoparticles show unique optical signatures, including sharp emission bandwidths and long lifetimes of the printed label, even under accelerated weathering conditions. Magnetic nanoparticles show distinct physical signals that depend on the size of the nanoparticle itself. They were also screen printed on different substrates and their magnetic signals read out using a magnetic pattern recognition sensor and a vibrating sample magnetometer. The novelty of our work lies in the demonstration that the combination of nanomaterials with optical and magnetic properties on the same printed support is possible, and the resulting combined signals can be used to obtain a user-configurable label, providing a high degree of security in anti-counterfeiting applications using simple commercially-available sensors.
authors.affiliation: Institute of Nanoscience of Aragon (INA) and Department of Chemical Engineering and Environmental Technology, University of Zaragoza, C/Mariano Esquillor, s/n, I + D + i Building, 50018, Zaragoza, Spain. CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Centro de Investigación Biomédica en Red. C/Monforte de Lemos 3-5, Pabellón 11, 28029 Madrid, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Campos-Cuerva
authors.forename: Maciej
authors.initials: M
authors.lastname: Zieba
authors.forename: Victor
authors.initials: V
authors.lastname: Sebastian
authors.forename: Gema
authors.initials: G
authors.lastname: Martínez
authors.forename: Javier
authors.initials: J
authors.lastname: Sese
authors.forename: Silvia
authors.initials: S
authors.lastname: Irusta
authors.forename: Vicente
authors.initials: V
authors.lastname: Contamina
authors.forename: Manuel
authors.initials: M
authors.lastname: Arruebo
authors.forename: Jesus
authors.initials: J
authors.lastname: Santamaria