CVD synthesis of carbon nanotubes was carried out using
ethanol paralysis in tubular quartz reactor at atmospheric pressure of
hydrogen. Ni, Co and Fe catalyst were used for CNT deposition. The CNT samples
obtained under various experimental conditions were studied by scanning
electron microscopy (SEM), X-ray fluorescent microanalysis and Raman
spectroscopy. The ratio of ID/IG of D (~1360 cm-1) and G (~1580 cm-1) Raman peaks was
monitored to estimate the crystalline of graphite-like material. The optimal
conditions for synthesis of CNTs on the Si-substrates and on the SiO2-based
fiberglass were determined. MWNT were produced with 25-30 nm diameters, up to 30
microns in length and with crystallite size La from 2.7nm to 7nm. DC
electrical properties of carbon composites MWNT/SiO2-fiberglass were
examined. Specific resistance was about 10 cm
and more depending on CNT content. It was found that the resistivity of the
carbon composites MWNT/SiO2 is sensitive to external pressure.
Processing of composite with binding polymer significantly improves stability
and repeatability of its voltage-current characteristics.
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