A nanotube may be a tube-shaped material, made from carbon, having a diameter measuring on the nanometer scale. A nanometer is one-billionth of a meter, or about one ten-thousandth of the thickness of a person's hair. The graphite layer appears somewhat sort of a rolled-up net with endless unbroken hexagonal mesh and carbon molecules at the apexes of the hexagons. Carbon Nanotubes have many structures, differing long , thickness, and within the sort of helicity and number of layers.