Journal
NEW CARBON MATERIALS
Volume 27, Issue 5, Pages 352-361Publisher
ELSEVIER
DOI: 10.1016/S1872-5805(12)60021-3
Keywords
Carbon nanotubes; Carbon fibers; Surface; Pretreatment; Modified CVD method
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Funding
- National Natural Science Foundation of China [51002170]
- Innovation Program of Shanghai Institute of Ceramics Chinese Academy of Sciences [Y12ZC6160G]
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Carbon nanotubes (CNTs) were synthesized on carbon fibers by a modified thermal chemical vapor deposition (CVD) method. The fibers were first treated at a temperature of 973 K and then treated by a mixture of sulfur acid and nitric acid with a volume ratio of 1:3 to improve the dispersion of catalyst precursor Fe(NO3)(3)center dot 9H(2)O on the surface before impregnation with a catalyst solution. The carbon fibers then underwent simultaneous catalyst reduction and CNT growth to decrease the contact time between the transition metal and the carbon fiber surface, and a uniform and thick CNT forest could be obtained with no significant decrease of the mechanical strength of the carbon fibers compared with those produced by traditional thermal CVD. An in-depth analysis shows that the process parameters have a great influence on the CNT growth rate, such as the type of solvent, concentration of Fe(NO3)(3)center dot 9H(2)O, the ratio of H-2 to C2H2, and the growth time. It was revealed that a better CNT forest could be obtained when the catalyst solvent is ethanol, the Fe concentration is 100 mmol/L, the ratio of H-2/C2H2 is 4/1, the temperature is 1 023 K and the growth time is 30 min.
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