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@prefix dct: <http://purl.org/dc/terms/> .
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    dct:description """
              This work deals with the interest in ion beams for controlling nanocrystals synthesis in glasses.<br />We show two different ways to reach this aim, insisting on importance of redox phenomena induced by the<br />penetration and implantation of ions in glasses. We first show that we can use the great energy density depo-<br />sited by the ions to tailor reducing conditions, favorable to metallic nanocrystal precipitation. In particular,<br />we show that microscopic mechanism of radiation induced silver precipitation in glasses are analogous to<br />the ones of classical photography. Ion beams can also be used to overcome supersaturation of elements in a<br />given matrix. In this work, we synthesized lead chalcogenide nanocrystals (PbS, PbSe, PbT e) whose optical<br />properties are interesting for telecom applications. We demonstrate the influence of complex chalcogenide<br />chemistry in oxide glasses, and its relationship with the observed loss of growth control when nanocrystals<br />are synthesized by sequential implantation of Pb and S in pure silica. As a consequence of this understanding,<br />we demonstrate a novel and controlled synthesis of PbS nanocrystals, consisting in implanting sulfur into a<br />Pb-containing glass, before annealing. Choice of glass composition provides a better control of precipitation<br />physico-chemistry, whereas use of implantation allows high nanocrystal volume fractions to be reached. Our<br />study of IR emission properties of these nanocrystals shows a very high excitation cross section, and evidence<br />for a dark exciton emitting level.
            """ ;
    dct:identifier "tel-00068157" ;
    dct:issued "2026-05-23T17:43:17.092116"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-23T17:43:17.092121"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "ION BEAM ASSISTED SYNTHESIS OF NANOCRYSTALS IN GLASSES<br />(SILVER AND LEAD CHALCOGENIDES)" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
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    dcat:keyword "ag",
        "infoeu-reposemanticsdoctoralthesis",
        "ion-irradiation",
        "irradiation-ionique",
        "lognormal",
        "lognormale",
        "nanocristaux",
        "nanocrystals",
        "pbs",
        "photoluminescence",
        "physphysphysics-physicsphysics-physics",
        "precipitation",
        "silicate-glass",
        "theses",
        "verre-silicate" ;
    dcat:landingPage <https://theses.hal.science/tel-00068157> .

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    dct:issued "2026-05-23T17:43:17.229822"^^xsd:dateTime ;
    dct:modified "2026-05-23T17:43:17.048371"^^xsd:dateTime ;
    dct:title "ION BEAM ASSISTED SYNTHESIS OF NANOCRYSTALS IN GLASSES<br />(SILVER AND LEAD CHALCOGENIDES)" ;
    dcat:accessURL <https://theses.hal.science/tel-00068157> .

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