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Nanostructures à propriétés optiques et thermiques pour l’élaboration de « Nanothermomètres »

Abstract : The study of the variation of luminescent properties with temperature is one of the promising way to measure temperature. Recent studies showed that luminescent nanomaterials allow a local and contactless temperature determination. This could be very useful in many applications like medicine, aeronautic, and marine or in the understanding of catalytic mechanism. ZnGa2O4:Cr3+ is a potential nanothermometer because of its high sensitivity on a large temperature range. Indeed, the luminescence lifetime is drastically dependent on temperature since the 4T2 and 2E emitted levels are in thermal equilibrium. In this study, we firstly optimized the luminescence properties of 10 nm in diameter nanoparticles with the aim of improving their capability as thermal nanosensor. In order to generate a local temperature increase, gold nanorods are then synthetized. Under an appropriate excitation, such gold nanoparticles may induce a heating due to their plasmonic properties. Once the calibration of the nanosensor is effective and the heat generation is highlighted by thermal camera pictures, both nanoheaters and nanothermometers were introduced in the same medium. The variation of the optical nanosensor response is promising. Thus this coupled system is considered as a potential candidate for hyperthermia treatments with a precise and controlled temperature.
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  • HAL Id : tel-02613761, version 1

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Estelle Glais. Nanostructures à propriétés optiques et thermiques pour l’élaboration de « Nanothermomètres ». Chimie inorganique. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS496⟩. ⟨tel-02613761⟩

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