Abstract
This study reports on the thermo-mechanical synthesis of carbon nano onions from elemental graphite powders. Initially, amorphous carbon was obtained by high energy ball milling technique from graphite powders. X-ray spectra taken from ball milled samples indicated that the hexagonal graphite, composed of layers, was transformed into the amorphous carbon for a shorter milling time of 5 h by high energy input about 78 times of gravity. Subsequent isothermal annealing of milled graphite powders was conducted at 1400 °C for 4 h in Ar gas. It was revealed via investigation of transmission electron microscopy that carbon nano onions were formed after annealing.
Kurzfassung
In dem vorliegenden Beitrag wird über die thermo-mechanische Herstellung von Kohlenstoff-Nanozwiebeln aus elementaren Graphitpulvern berichtet. Anfänglich wurde hierzu amorpher Kohlenstoff mittels einer hochenergetischen Kugelmahltechnik aus Graphitpulvern hergestellt. Die Röntgenspektren, die von den kugelgemahlenen Proben erstellt wurden, weisen darauf hin, dass der hexagonale aus Schichten aufgebaute Graphit in amorphen Kohlenstoff bei einer kürzeren Mahlzeit von fünf Stunden mittels eines hohen Energieeintrages der 78-fachen Schwerkraft umgewandelt wurde. Nachfolgend wurde ein isothermisches Anlassen der gemahlenen Graphitpulver bei 1400 °C über vier Stunden in Ar-Gas durchgeführt. Mittels einer TEM-Untersuchung ergab sich, dass sich nach dem Glühen Kohlenstoff-Nanozwiebeln gebildet hatten.
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