Carbon nanotubes are cylinder-shaped graphite sheets. They may consist of a single layer (SWCNTs) or many layers (MWCNTs). They have high thermal and electrical conductivity and are utilized in a wide variety of applications. Some high growth applications of carbon nanotubes are in electronic devices, electrochemical sensors and biosensors, transistors, lithium-ion (li-ion) batteries, hydrogen storage cells, cathode ray tubes, electrostatic discharge protection and electrical shielding applications.