Use of Carbon Black in Carbon Nanotechnology
1 November 2007Carbon blacks are soot particles produced by pyrolysis of industrial waste and these are recently been studied for various physical parameters. On the basis of a number of factors such as low production cost and purity these carbon blacks can be a starting material for carbon nanotechnology.
One of the major drawback of carbon blacks is its low crystallinity as observed by high resolution transmission electron micrographs (HRTEM) and the carbon blacks are categorised as amorphous carbon. Researchers have produced carbon nano-onions from carbon blacks upon irradiation of electron beam of high current density of 150A/cm square. It has already been observed by the researchers that carbon black samples having low crystallinity fail to form carbon onions.
The nano-onions formed during the process show some of the characteristics. Larger nano-onions formed during the process have comparitively more structural defect than small onions. During the process the outermost graphite layer is mostly removed under electron beam irradiation and the innermost shell look like fullerene.
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