Method for producing carbon coated nanoparticles of a...

Details Method for producing carbon coated nanoparticles of a... Method for producing carbon coated nanoparticles of a...

C - Chemistry, Metallurgy

01

G

C01G 23/04 (2006.01) B82B 3/00 (2006.01) C01B 31/30 (2006.01) C01G 25/02 (2006.01) C01G 27/02 (2006.01)

Patent

CA 2690121

The invention relates to a method for producing nanoparticles of at least one oxide of a transition metal selected from Ti, Zr, Hf, V, Nb and Ta, which are coated with amorphous carbon, wherein said method includes the following successive steps: (i) a liquid mixture containing as precursors at least one alkoxyde of the transition metal, an alcohol, and an acetic acid relative to the transition metal is prepared and diluted in water in order to form an aqueous solution, the precursors being present in the solution according to a molar ratio such that it prevents or sufficiently limits the formation of a sol so that the aqueous solution can be freeze-dried, and such that the transition metal, the carbon and the oxygen are present in a stoichiometric ratio according to which they are included in the nanoparticles; (ii) the aqueous solution is freeze-dried; (ii) the freeze-dried product obtained during the preceding step is submitted to pyrolysis under vacuum or in an inert atmosphere in order to obtain the nanoparticles. The invention also relates to the application of the method for producing transition metal carbide.

Procédé de fabrication de nanoparticules d'au moins un oxyde de métal de transition choisi parmi Ti, Zr, Hf, V, Nb et Ta enrobées de carbone amorphe, le procédé comprenant les étapes successives suivantes : (i) un mélange liquide contenant en tant que précurseurs au moins un alkoxyde du métal de transition, un alcool, de l'acide acétique en excès vis à vis du métal de transition est préparé puis dilué dans de l'eau afin de former une solution aqueuse, les précurseurs étant présents dans la solution aqueuse selon un rapport molaire tel qu'il prévient ou limite suffisamment la formation d'un sol pour que la solution aqueuse soit lyophilisable et tel que le métal de transition, le carbone et l'oxygène sont présents selon le rapport stoechiométrique dans lequel ils se trouvent dans les nanoparticules, (ii) la solution aqueuse est soumise à une lyophilisation, (iii) le lyophilisât obtenu à l'étape précédente est pyrolyse sous vide ou sous atmosphère inerte afin d'obtenir les nanoparticules. L'invention concerne également l'application du procédé à la fabrication de carbure de métal de transition.

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