Abstract
Multi-scale hybrid structures of multi-walled carbon nanotubes (MWCNTs) and micrometric alumina particles (μAl 2O 3) have been produced. The hybrid structures are obtained by in situ grafting carbon nanotubes (CNTs) on spherical μAl 2O 3 particles using an easy chemical vapor deposition method, without any pre-patterned catalyst treatment. The study of the influence of temperature and hydrogen ratio shows three regular hybrid structures defined according to CNT arrangement on μAl 2O 3. Furthermore, the organization modes demonstrate that the hybrid structures are strongly dependent on the diameter, length and area number density of CNTs. This dependency has been explained using a proposed nano-cantilever beam model. It evaluates the maximum deflection of one CNT due to weak van der Waals interactions. The model analysis shows that the MWCNT organizations are a result of varying competitive interactions between MWCNT rigidity and their attractive forces on the large curvature surface of μAl 2O 3. In addition, the influence of specific characteristics of μAl 2O 3 on hybrid structures is also discussed.
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