By Sadegh Imani Yengejeh, Seyedeh Alieh Kazemi, Andreas Öchsner
This quantity offers a complete method for categorizing carbon nanotubes and their variations by way of nano sheets, nanotubes, microscopic and atomic changes. moreover, the fabric and geometric houses of those nano-configurations are addressed. finally, it introduces a couple of universal software program applications for geometry new release and a number of other advertisement finite point programs.
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Additional info for A Primer on the Geometry of Carbon Nanotubes and Their Modifications
18 illustrates the configuration of CNTs which were simulated from straight model to twisted CNT with a 10° twisting angle. 19. 20. g. Si-doping, carbon vacancy and perturbation, which might impure the structure of perfect CNTs. 1 Doping This random imperfection corresponds to the case where a finite number of c arbon atoms were replaced by silicon, nitrogen, boron, etc. 21 for the silicon atom. 22. 23. Chapter 6 Degenerated Tubes Beside carbon nanotubes, there are some other configurations of nanostructures, such as nanocones, capped CNTs, fullerene molecules, etc.
In particular, all armchair CNTs are metallic, and zigzag tubes are metallic when n1 is a multiple of three. 13 illustrate the configuration of some hetero-junction CNTs with pentagon and heptagon pair defects. By introducing these pair defects at two diametrically-opposed sides of the structure, the axis of the two connected nanotubes make an angle around 35°. Bending angles of that order of magnitude have been observed experimentally by TEM . It is possible to have a smaller angle by locating the pentagon and heptagon closer to each other .
2 Buckminsterfullerene Buckminsterfullerene (or Bucky-balls) is some kind of spherical-shaped fullerene molecule which has cage-like fused-ring configurations . 3 illustrates a model of buckminsterfullerene. 3 Capped CNTs By rolling up a graphene sheet as a cylinder and capping each side of the cylinder with half of the fullerene molecule, a capped CNT is modeled. 4 shows single-walled armchair and zigzag capped CNTs. 1 Material and Geometric Properties In a CNT, carbon atoms are bonded together by covalent bonds which have their specific lengths and angles in a three-dimensional space.
A Primer on the Geometry of Carbon Nanotubes and Their Modifications by Sadegh Imani Yengejeh, Seyedeh Alieh Kazemi, Andreas Öchsner