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Depozice a zpracování uhlíkových nanotrubek připravených metodou PECVD za atmosférického tlaku
Kučerová, Z. ; Zajíčková, L. ; Jašek, O. ; Eliáš, M. ; Synek, P. ; Matějková, Jiřina ; Rek, Antonín ; Buršík, Jiří
Carbon nanotubes (CNTs) were synthesized by plasma enhanced chemical vapor deposition from mixture of argon, methane and hydrogen using microwave plasma torch at atmospheric pressure. Nanotubes grew on a complex substrate system consisting of silicon wafer, buffer layer and thin catalytic iron film. As confirmed by scanning electron microscopy (SEM), this deposition technique produces bundles or ropes of nanotubes covered by crust composed of catalytic particles, amorphous carbon and other impurities such as fullerenes or other carbon nanoparticles. Because many scientific and technological applications, as well as characterization techniques require individual nanotubes a great attention has to be paid to the post-deposition processing of the deposit. The nanotube bundle could be separated by ultrasonication of the deposit in organic or inorganic liquid. Most commonly used liquids are water or ethanol.
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Charakterizace mikrostrtuktury kvazikrystalického aproximantu Al77,5Cr16,5Fe6
Svoboda, Milan ; Buršík, Jiří ; Janovec, J. ; Dolinšek, J.
Characterisation of the quasicrystalline approximant in Al77,5Cr16,5Fe6 alloy is the main aim of this work. The characterisation was performed by transmission electron microscopy,electron diffraction,scanning electron microscopy and energy dispersive X-ray spectroscopy. By using those methods we have identified 2 phases differing each other especially by content of iron.
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