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Assemblage dirigé de nanoparticules colloïdales par nanoxérographie : développement et application à la réalisation de marquages sécurisés

Abstract : Directed assembly of colloidal nanoparticles is a fundamental step for observation and quantitative measurement of their physical properties, as well as using them for the conception and manufacturing of innovative functional devices. This research aim to enhance a technique used for fast directed assembly of a wide range of colloidal nanoparticles : atomic force microscopy (AFM) nanoxerography. This technique consists of two steps : (i) injection of charge patterns written on a thin layer of electret, followed by (ii) an immersion of the electret into the colloidal solution. This last step allows nearly instantaneous selective deposition of nanoparticles onto the charge patterns. Fine tuning of few experimental levers and chemical synthesis of customized nanoparticles solution with finely tuned physical properties has allowed us to further our understanding of the assembly obtained with AFM nanoxerography mechanics. Three previously known limitations of the technique have been lifted : binary assembly, single nanoparticle assembly and multilayered assembly. Results obtained have then been used to design and produce microtags out of rare-earth based photo-luminescent NaYF4 nanocrystals, with tremendous potential for product traceability and fight against counterfeiting.
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  • HAL Id : tel-02083558, version 1

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Pierre Moutet. Assemblage dirigé de nanoparticules colloïdales par nanoxérographie : développement et application à la réalisation de marquages sécurisés. Micro et nanotechnologies/Microélectronique. INSA de Toulouse, 2014. Français. ⟨NNT : 2014ISAT0046⟩. ⟨tel-02083558⟩

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