Inks based on metallic nanoparticles used as optical and magnetic markings for anti-counterfeiting purposes

• Autores: Maciej Zieba
• Directores de la Tesis: Manuel Arruebo Gordo (dir. tes.), Jesús Santamaría Ramiro (dir. tes.)
• Lectura: En la Universidad de Zaragoza ( España ) en 2016
• Idioma: español
• Tribunal Calificador de la Tesis: Manuel Ricardo Ibarra García (presid.), Miguel Ángel Caballero López (secret.), Xavier Obradors Berenguer (voc.)
• Materias:
  • Ciencias tecnológicas
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• Resumen

  • Nanotechnology is a field of research with a high potential for brand protection. The list of nano-based anti-counterfeiting techniques, such as nanoholography, nanolithography or nanobarcodes is long and increases every year. The cooperation between industry and academia seems necessary to obtain successful results in order to understand which protection technologies are easily applicable to the corresponding manufacturing process. In this work we have studied the possibility of developing more sophisticated (difficult to counterfeit) and more effective (easily read and validated) methods based on printed nanoparticles with specific magnetic and optical signals as anti-counterfeiting tags and this is the main objective of this thesis.

    We have explored the possibility of obtaining advanced anti-counterfeiting capabilities by using a relatively simple method, susceptible of industrial application. We have chosen nanoparticles without (or with minimal) functionalization (gold, silver, up-conversion and magnetite) and applied them on different paper (and other) supports by inkjet and screen printing technologies. The chosen nanoparticle combination can therefore provide optical and magnetic signals on the same tagging act, i.e., multiple tags can be screen printed, overlapped on the same spot, and the resulting signals easily detected. Other aspects relevant to their potential application such as the influence of the paper support and the ability of the labels to withstand accelerated weathering conditions after tagging have also been studied.

    In this thesis novel nano-based inks with optical properties (based on gold and silver nanoparticles) and with magnetic properties (based on magnetite nanoparticles) were formulated and the nanoparticles synthesized in the laboratory were mixed with commercially available inks purchased from Epson and HP without modifying their intrinsic characteristics.

    It can be concluded that due to the narrow absorption peaks and high synthesis reproducibility gold and silver nanoparticles can be used as optical nanotags and it is possible to formulate nano-based inks with high stability that can be printed using inkjet and serigraphy.