The electrical and mechanical properties and actual structure of carbon nanotubes are discussed in detail. These are large macromolecules that are unique for their size, shape, and remarkable physical properties. In these last twenty years, carbon nanotubes have attracted much attention from physicists, chemists, material scientists, and electronic device engineers because of their excellent structural, electronic, optical, chemical and mechanical properties. Physical and chemical properties of carbon nanotubes. Generally, synthesis methods of carbon nanotubes can be classified into two main categories corresponding to different temperatures. Carbon nanotubes cnts are tubes made of carbon with diameters typically measured in. Download limit exceeded you have exceeded your daily download allowance. Carbon nanotubesproperties and applications juniper publishers. A few to a few tens of concentric cylinders with the regular periodic interlayer spacing locate around ordinary central hollow and made mwcnts. A carbon nanotube cnt is a hexagonal array of carbon atoms rolled up into a long, thin, hollow cylinder 2 and are known for their size, shape.
The outstanding electrical, mechanical and thermal properties of carbon nanotubes cnts 1,2 have made them among the most promising materials in a. Properties, synthesis, purification, and medical applications article pdf available in nanoscale research letters 91. The production of carbon nanotubes can be done by plasma based synthesis method or arc discharge evaporation method, laser ablation method, thermal synthesis process, chemical vapor deposition and. Rollup of a graphene sheet leading to the three different types of cnt. In graphene, carbon atoms are densely organized in a regular sp2. We show that carbon nanotubes may take on properties that are normally associated with molecular species, such as solubility in organic solvents, solution based. Electrical conductivity of individual carbon nanotubes. The high temperature routes, such as the electricarc discharge technique. Carbon nanotubes carbon nanotubes, long, thin cylinders of carbon, were discovered in 1991 by sumio iijima.
Pure cnt consist of only one or several hexag onal graphene sheets of carbon. The field of nanotechnology and nanoscience push their investigation forward. These electrical properties, however, do not depend on whether the tube is rolled up above. Carbon can bond in different ways to construct structures with completely different properties. The interest in carbon nanotubes has been greatly stimulated by theoretical predictions that their electronic properties are strongly modulated by small structural variations18. The carbon network of the shells is closely related to the honeycomb arrangement of the carbon atoms in the graphite sheets. Carbon nanotubes cnts have been under scientific investigation more than fifteen years since their unique properties predestine them for numerous potential applications. Multiwalled carbon nanotubes, nm400, nm401, nm402, nm403. The electronic properties of carbon nanotubes uci physics and. Single wall carbon nanotubes swcnts have unique mechanical and. Studying the electronic properties of carbon nanotubes one can start with the simplest model, a graphene sheet and treat the curvature as. The chapter concludes with a short survey of nearterm applications which take advantage of nanotube electronic properties. Most of the physical properties of carbon nanotubes derive from graphene. The amazing mechanical and electronic properties of the nanotubes stem in their quasione.1017 819 767 162 1109 183 205 1250 205 1511 265 490 68 1450 1466 883 1481 869 1219 1541 70 125 412 1395 1228 170 368 855 1116 646 706 794 353 1481 1383 1494