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Licensed Unlicensed Requires Authentication Published by De Gruyter October 1, 2014

Formation of Carbon Nano Onions by Thermo-Mechanical Processing of Graphite Powders

Bildung von Kohlenstoff-Nanozwiebeln mittels thermo-mechanischer Bearbeitung von Graphitpulvern
Ömer Güler and Ertan Evin
From the journal Materials Testing

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.


* Correspondence Address, Dr. Ömer Güler, Fırat University, Engineering Faculty, Metalurgical and Materials Eng. Dep., Elazıg/Turkey, E-Mail:

Ömer Güler was born in Turkey in 1982. He worked as research assistant at Fırat University in Metalurgical and Material Eng. Dep., Turkey from 2004 to 2012 and worked as Asst. Prof. for one year. His PhD thesis is concerning “carbon nanotubes synthesis via ball milling process”. Also his work areas are Carbon nanotube synthesis by CVD method, CNT reinforced composites, and some advanced materials.

Ertan Evin was born in Turkey in 1969. He worked as Assc. Prof. in Fırat University Metalurgical and Material Ang. Dep., Turkey. His work areas are superconductors, superalloys, carbon nanotubes and nanomaterials.


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Published Online: 2014-10-01
Published in Print: 2014-03-03

© 2014, Carl Hanser Verlag, München