Journal
CARBON
Volume 90, Issue -, Pages 25-33Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.03.048
Keywords
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Funding
- Thuringian Ministry for Economics, Labor and Technology [FKZ2011FGR0089]
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Carbon nanotubes and carbon nanofibers were grown at different temperatures on porous ceramic Al2O3 substrates with single channel geometry by means of a chemical vapor deposition technique using methane as carbon source and palladium as catalyst. Time-resolved in-situ Fourier transformed infrared spectroscopy was used for the investigation of methane decomposition for characterizing the catalyst's performance. With increasing synthesis temperature, a structural transition from carbon nanofibers to carbon nanotubes was observed. At a synthesis temperature of 700 degrees C, solely carbon nanofibers were found, whereas at 800 degrees C a mixture of two types of bamboo-shaped carbon nanofibers were obtained, suggesting a structural transition. A synthesis temperature to 850 degrees C results in bamboo-shaped multi-walled carbon nanofibers and multiwalled carbon nanotubes. The carbon products and the observed structural transition were characterized by means of field emission scanning electron microscopy, high-resolution transmission electron microscopy, thermal gravimetric analysis, and Raman spectroscopy. (C) 2015 Elsevier Ltd. All rights reserved.
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