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Theses

SYNTHÈSE ASSISTÉE PAR FAISCEAUX D'IONS D'AGRÉGATS DANS
LES VERRES (ARGENT ET CHALCOGÉNURES DE PLOMB)

Abstract : This work deals with the interest in ion beams for controlling nanocrystals synthesis in glasses.
We show two different ways to reach this aim, insisting on importance of redox phenomena induced by the
penetration and implantation of ions in glasses. We first show that we can use the great energy density depo-
sited by the ions to tailor reducing conditions, favorable to metallic nanocrystal precipitation. In particular,
we show that microscopic mechanism of radiation induced silver precipitation in glasses are analogous to
the ones of classical photography. Ion beams can also be used to overcome supersaturation of elements in a
given matrix. In this work, we synthesized lead chalcogenide nanocrystals (PbS, PbSe, PbT e) whose optical
properties are interesting for telecom applications. We demonstrate the influence of complex chalcogenide
chemistry in oxide glasses, and its relationship with the observed loss of growth control when nanocrystals
are synthesized by sequential implantation of Pb and S in pure silica. As a consequence of this understanding,
we demonstrate a novel and controlled synthesis of PbS nanocrystals, consisting in implanting sulfur into a
Pb-containing glass, before annealing. Choice of glass composition provides a better control of precipitation
physico-chemistry, whereas use of implantation allows high nanocrystal volume fractions to be reached. Our
study of IR emission properties of these nanocrystals shows a very high excitation cross section, and evidence
for a dark exciton emitting level.
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https://tel.archives-ouvertes.fr/tel-00068157
Contributor : Roch Espiau de Lamaestre <>
Submitted on : Wednesday, May 10, 2006 - 4:49:29 PM
Last modification on : Wednesday, September 16, 2020 - 4:17:40 PM
Long-term archiving on: : Monday, September 17, 2012 - 2:25:10 PM

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Roch Espiau de Lamaestre. SYNTHÈSE ASSISTÉE PAR FAISCEAUX D'IONS D'AGRÉGATS DANS
LES VERRES (ARGENT ET CHALCOGÉNURES DE PLOMB). Physique [physics]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00068157⟩

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