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Author Flahaut, E. ♦ Laurent, Ch. ♦ Peigney, A. ♦ Flahaut, Emmanuel
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Catalytic Cvd Synthesis ♦ Triple-walled Carbon Nanotube ♦ Catalyst Preparation ♦ Citric Acid ♦ Catalyst Composition ♦ Catalyst Preparation Condition ♦ Double-walled Cnts ♦ Ccvd Synthesis Towards Cnts ♦ Combustion Route ♦ Co-axial Wall ♦ Carbon Nanotube ♦ Catalytic Chemical Vapour Deposition ♦ Ccvd Condition ♦ Carbon Nanofibres ♦ Combustion Condition ♦ Identical Chemical Composition ♦ Triple-walled Cnts
Abstract We report the influence of catalyst preparation conditions for the synthesis of carbon nanotubes (CNTs) by catalytic chemical vapour deposition (CCVD). Catalysts were prepared by the combustion route using either urea or citric acid as the fuel. We found that the milder combustion conditions obtained in the case of citric acid can either limit the formation of carbon nanofibres (defined as carbon structures not composed of perfectly co-axial walls or only partially tubular) or increase the selectivity of the CCVD synthesis towards CNTs with fewer walls, depending on the catalyst composition. It is thus for example possible in the same CCVD conditions to prepare (with a catalyst of identical chemical composition) either a sample containing more than 90 % double- and triple-walled CNTs, or a sample containing almost 80 % double-walled CNTs.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study