Abstract
Milligrams of onion-like fullerenes, so-called carbon onions, have been synthesized by heating diamond clusters in inert ambient at atmospheric pressure. Diamond clusters, of which average grain size is 5nm, were heated up to 1730°C and maintained at the temperature for 1minute in argon using an infrared image furnace. Transformation of diamond clusters into onion-like fullerenes was confirmed by high-resolution electron microscopy, which showed onion-like fullerenes have a well-controlled size ranging from 5 to 10 nm. Ball-on-disk type friction testing was conducted to characterize the tribological properties of onion-like fullerenes as a solid lubricant. As a result, onion-like fullerenes have exhibited lower friction, compared with graphite powders, in both air and vacuum. This low friction property of onion-like fullerenes has been displayed on a sliding disk with lower surface roughness and higher hardness.
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