Cooking up carbon doughnuts.
Daniel T. Colbert of Rice University in Houston and his coworkers have now found, amid the tangled mass of buckytubes and ropes typically produced from carbon vapor, doughnut-shaped rings of carbon atoms. Such rings apparently result when the ends of a growing nanotube meet and fuse.
Carbon doughnuts show up regularly in electron micrographs and scanning force microscope images of laser-grown carbon nanotube material. "We see these perfect circles nearly every time we look," says Rice's Richard E. Smalley. Ring diameters typically range from 300 to 500 nanometers.
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|Title Annotation:||discovery of doughnut-shaped rings of carbon atoms|
|Article Type:||Brief Article|
|Date:||Mar 29, 1997|
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