. . . . . . . . . .    ANM 2010     3rd International Conference on Advanced Nano Materials     12-15 September 2010 - Agadir, Morocco Back    Abstract ANMM320 SOLVOTHERMAL PREPARATION AND PHYSICO-CHEMICAL CHARACTERIZATION OF DISULFIDE MOLYBDENUM NANOSPHERES MoS2 N. ALLALI1, H. AKRAM1, M. EL FARJI1, T. CHAFIK1, M. DANOT2, A. M. MARIE2, A. LAFOND2 (1) Laboratoire de Génie Chimique et Valorisation des Ressources, Université Abdelmalek Essaadi, Faculté des Sciences et Techniques de Tanger, BP 416, 90000 Tanger, Maroc (2) Institut des Matériaux Jean Rouxel, CNRS-UMR N° 6502, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 3, France . Nanomaterials with controlled morphology such as nanospheres, nanotubes or nanofibers are increasingly appealing to the global scientific community. Furthermore, these materials are used in diverse industrial applications where the texture of the product must adapt to exacting standards and prerequisites. More particularly, disulfide molybdenum nanospheres can be used in tribology as a solid lubricant and in oil refining as catalysts for hydrotreatment. However, the methods of elaboration currently used to obtain this type of morphology require synthesis at high temperatures (of over 400 °C) and often result in a low rate of nanoparticles in the final product, which can be a major handicap for industrial applications. The research presented in this paper suggests a new elaboration method for MoS2 nanospheres; it allowed us to obtain, at low temperatures, a 100% nanospheres in the final product. The method consists in provoking the reaction, in a closed autoclave, of elemental sulfur with ammonium heptamolybdate, in the presence of a reducer at temperatures nearing 200°C, and using ethylenediamine as a solvent. Research with Scanning Electron Microscopy (SEM) and High Resolution Transmission Electronic Microscopy (HRTEM) have shown that these nanospheres are hollow with an envelope of between 10 and 20 nm; they have diameters ranging from 100 to 500 nm; and the S/Mo molar ratio neighbors 2, which confirms the formulation MoS2. Moreover, these nanoparticles are amorphous and have diverse grain sizes, which we measured by laser granulometry. Their maximum size is 5000 nm, which proves the existence of aggregates of 10 to 15 nanospheres, confirmed by HRTEM. . © nanoAC . . . . . . . . . .

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