Croissance de nanofilaments d'oxyde d'aluminium et d'oxyde de gallium dans un arc électrique : étude microstructurale et propriétés optiques

Abstract : Nanowires of aluminas and gallium oxide were synthesized by controlled oxidation of molten metal in an electric arc. The obtained powders are constituted of several morphologies of nanowires and nanoparticules, and several phases. The microstructural analysis carried out by diffraction of x-rays, SEM, TEM and associated spectroscopies enable to connect each morphology to the phase constituting it. The analysis of the stability of the different phases of alumina made it possible to specify the thermal conditions of the nanowires formation. A vapour-solid mechanism of growth is proposed starting from the study of the process. The photoluminescence and cathodoluminescence properties of gallium oxide and alumina powders were studied. The emission bands come mainly from structural defects (vacancies). An original band of luminescence was identified in the red for the alumina powders that contained a rare
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Claire Arnoult. Croissance de nanofilaments d'oxyde d'aluminium et d'oxyde de gallium dans un arc électrique : étude microstructurale et propriétés optiques. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL081N⟩. ⟨tel-01752546⟩

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