Carbon nanotubes electrical conductivity

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An important difference between boron nitride nanotubes and carbon nanotubes is their conductivity. Carbon nanotubes conduct electrical current but boron nitride tubes act as insulators. In 2003, scientists were able to combine these two sorts of nanotubes into one structure a conducting carbon nanombe with an insulating boron nitride sheath. 

The newest addition to the forms of elemental carbon is the nanotube. A carbon nanotube is a long cylinder of carbon atoms, connected together in much the same way as in a fullerene. Both the diameter and the length of carbon nano-tubes can vary. Properties of nanotubes, such as their ability to conduct electrical charge, change dramatically with the dimensions of the tube. Carbon nanotubes are under intensive study. For example, a carbon nanotube laid down on a silicon chip forms a molecular transistor. Such devices may eventually lead to further miniaturization of the chips that are at the heart of modem computers. 

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