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|Type:||Artigo de evento|
|Title:||Effects Of The Process Parameters On The Carbon Nanotubes Growth By Thermal Cvd|
|Abstract:||Multiwall carbon nanotubes were grown by thermal chemical vapor deposition with a metal catalyst. This approach employs a metal film deposition onto a SiO2/Si substrate followed by a thermal annealing to generate metal particles able to convert carbon containing gas (methane or acetylene) into carbon nanotubes. Nickel was used as a metal catalyst, and the influence of different growth parameters on the CVD process was investigated. The studies have shown that the effect of the methane concentration depends essentially on the process temperature. We have also observed that the catalytic capacity of the nickel depends on the carbon gas precursor reactivity. Moreover, it is generally assumed that the metal particle size determines the carbon nanotube diameter but, according to our research, this seems to be valid only for relatively small metal particles when the tip growth mechanism predominates. For relatively large metal particles, a hybrid growth mechanism (probably involving both tip and base growth models) can be considered, and the size of the particle does not determine the diameter of the resulting nanotube.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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