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Carbon nanotube bags: Catalytic formation, physical properties, two-dimensional alignment and geometric structuring of densely filled carbon tubes
Citation key ISI:000169765800020
Author Schneider, J J and Engstler, J and Franzka, S and Hofmann, K and Albert, B and Ensling, J and Gutlich, P and Hildebrandt, P and Dopner, S and Pfleging, W and Gunther, B and Muller, G
Pages 2888-2895
Year 2001
ISSN 0947-6539
Address PO BOX 10 11 61, D-69451 BERLIN, GERMANY
Journal Chem. Eur. J
Volume 7
Number 13
Month JUL 2
Abstract The catalytic CVD synthesis, using propyne as carbon precursor and Fe(NO3)(3) as catalyst precursor inside porous alumina, gives carbon nanotube (CNT) bags in a well-arranged two-dimensional order. The tubes have the morphology of bags or fibers, since they are completely filled with smaller helicoidal CNTs. This morphology has so far not been reported for CNTs. Owing to the dense filling of the outer mother CNTs with small helicoidal CNTs, the resulting CNT fibers appear to be stiff and show no sign of inflation, as sometimes observed with hollow CNTs. The fiber morphology was observed by raster electron microscopy (REM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The carbon material is graphitic as deduced from spectroscopic studies (X-ray diffraction, Raman and electron energy-loss spectroscopy (EELS)). From Mossbauer studies, the presence of two different oxidation states (Fe-0 and Fe-III) of the catalyst is proven. Geometric structuring of the template by two different methods has been studied. Inkjet catalyst printing shows that the tubes can be arranged in defined areas by a simple and easily applied technique. Laser-structuring creates grooves of nanotube fibers embedded in the alumina host. This allows the formation of defined architectures in the mum range. Results on hydrogen absorption and field emission properties of the CNT fibers are reported.
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