High-pressure catalytic chemical vapor deposition of ferromagnetic ruthenium-containing carbon nanostructures
作者： Vyacheslav O. Khavrus , E. M. M. Ibrahim , Alicja Bachmatiuk , Mark H. Rümmeli , A. U. B. Wolter
DOI: 10.1007/S11051-012-0914-5
关键词:
摘要: We report on the high-pressure catalytic chemical vapor deposition (CCVD) of ruthenium nanoparticles (NPs) and single-walled carbon nanotubes (SWCNTs) by means gas-phase decomposition acetonitrile ruthenocene in a tubular quartz flow reactor at 950 °C elevated pressures (between 2 8 bar). The deposited material consists Ru metal cores with sizes ranging between 1 3 nm surrounded matrix. CCVD seems to be an effective route obtain composite materials containing metallic NPs, this work, inside nanostructured matrix protecting them from oxidation ambient air. find that contradiction weak paramagnetic properties characterizing bulk ruthenium, synthesized samples are ferromagnetic as predicted for nanosized particles nonmagnetic materials. At low pressure, very small catalyst able catalyze growth SWCNTs. Their yield decreases increasing reaction pressure. Transmission electron microscopy, selected area energy-dispersive X-ray analysis, Raman spectroscopy, magnetic measurements were used analyze confirm NPs nanotubes. A discussion mechanism Ru-containing nanostructures is presented.
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