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Theses

Silver and/or mercury doped thioarsenate and thiogermanate glasses : Transport, structure and ionic sensibility

Abstract : The aim of the thesis is to study the physicochemical properties of the silver halide doped chalcogenide glasses for the possibility to use them as chemical sensors for quantitative analysis of Hg²⁺ ions. First, the macroscopic properties of AgY-As₂S₃ (Y = Br, I), HgS-GeS₂, AgI-HgS-As₂S₃ and AgI-HgS-GeS₂ glassy systems such as the densities and the characteristic temperatures (Tg and Tc) were measured and analyzed according to the glass compositions. Second, the transport properties were studied using complex impedance and dc conductivity. Measurements show that the silver halide doped chalcogenide glasses exhibit two drastically different ion transport regimes above the percolation threshold at xc ≈ 30 ppm : (i) critical percolation, and (ii) modifier-controlled regimes. Third, to unveil the composition/structure/property relationships, various structural studies were carried out. Raman spectroscopy, high-energy X-ray diffraction, neutron diffraction and small-angle neutron scattering experiments, together with RMC/DFT and AMID modelling were employed. Finally, the last part was a preliminary study of the characteristics of new chemical sensors. It was devoted to study the relationship between the membranes' composition and sensitivity but also detection limits.
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https://tel.archives-ouvertes.fr/tel-02001885
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Submitted on : Thursday, January 31, 2019 - 2:05:30 PM
Last modification on : Tuesday, May 21, 2019 - 9:01:52 PM
Long-term archiving on: : Wednesday, May 1, 2019 - 5:52:29 PM

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  • HAL Id : tel-02001885, version 1

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Rayan Zaiter. Silver and/or mercury doped thioarsenate and thiogermanate glasses : Transport, structure and ionic sensibility. Material chemistry. Université du Littoral Côte d'Opale, 2018. English. ⟨NNT : 2018DUNK0485⟩. ⟨tel-02001885⟩

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