PROCESS FOR SYNTHESIZING CARBON NANOTUBES ON MULTIPLE SUPPORTS

摘要

The present invention relates to a process for synthesizing carbon nanotubes by continuous chemical vapour deposition at the surface of reinforcements, said reinforcements constituting a mixture A (i) of particles and/or fibres of a material comprising at least one oxygen atom and (ii) of particles and/or fibres of a material chosen from carbides and/or of a material comprising at least one silicon atom, said process comprising the following steps, carried out under a stream of inert gas(es) optionally as a mixture with hydrogen: (i) heating of said mixture of reinforcements A in a reaction chamber at a temperature ranging from 400° C. to 900° C.; (ii) introducing into said chamber a source of carbon consisting of acetylene and/or xylene, and a catalyst comprising ferrocene; (iii) exposing said heated mixture A to the source of carbon and to the catalyst comprising ferrocene for a sufficient time to obtain carbon nanotubes at the surface of the reinforcements constituting said mixture A; (iv) recovering a mixture B at the end of step (iii), optionally after a cooling step, said mixture B consisting of the mixture (A) of reinforcements comprising carbon nanotubes at their surface; (v) optionally, separation (a) of the particles and/or fibres of a material comprising at least one oxygen atom, (b) of the particles and/or fibres of a material chosen from carbides and/or of a material comprising at least one silicon atom.

主权项

1. A process for the synthesis of carbon nanotubes (abbreviation CNTs) by chemical vapor deposition (abbreviation CVD) at the surface of articles, said articles being provided in the form of a mixture A (i) of particles and/or fibers of a material comprising at least one oxygen atom and (ii) of particles and/or fibers of a material chosen from carbides and/or of a material comprising at least one silicon atom, said process comprising the following steps, carried out under a stream of inert gas(es), optionally in mixture with hydrogen:
(i) heating, in a reaction chamber, said mixture A of articles at a temperature of between 400° C. and 900° C.; (ii) introducing, into said chamber, a carbon source comprising acetylene and/or xylene and a ferrocene-comprising catalyst; (iii) exposing said heated mixture A to said carbon source and to said ferrocene-comprising catalyst for a period of time sufficient to obtain CNTs at the surface of the articles forming said mixture A; (iv) recovering a mixture B at the end of step (iii), optionally after a cooling step, said mixture B being formed of the mixture A of articles comprising CNTs at their surface; (v) optionally separating the particles and/or fibers of a material comprising at least one oxygen atom, said particles and/or fibers comprising CNTs at their surface, from the particles and/or fibers of a material chosen from carbides and/or comprising at least one silicon atom, said particles and/or fibers comprising CNTs at their surface.