Nanotechnology relates to the creation of devices, structures and systems whose size ranges from 1 to 100 nanometers (nm). These creations also exhibit novel physical, chemical or biological properties because of their nano scale size. Carbon nanotubes are micron-long and nanometer-thick cylindrical shells of carbon that have been making a pivotal contribution to the advancement of technology at the molecular level. Carbon nanotubes have been found to exhibit incredible strength and elasticity as well as extraordinary thermal and electrical conductivities. To understand the CNT’s structure, it helps to imagine folding a two dimensional graphene sheet. Depending on the dimensions of the sheet and how it is folded, several variations of nanotubes can arise. Also, just like the single or the multilayer nature of graphene sheets, the resulting tubes may be a single or a multiwall type.
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