Mobility, carbon nanotubes

Snow, E. S. Campbell, P. M. Ancona, M. G. Novak, J. P. 2005. High-mobility carbon-nanotube thin-film transistors on a polymeric substrate. Appl. Phys. Lett. 86 033105-033107. 

TT-Electron materials, which are defined as those having extended Jt-electron clouds in the solid state, have various peculiar properties such as high electron mobility and chemical/biological activities. We have developed a set of techniques for synthesizing carbonaceous K-electron materials, especially crystalline graphite and carbon nanotubes, at temperatures below 1000°C. We have also revealed new types of physical or chemical interactions between Jt-electron materials and various other materials. The unique interactions found in various Jt-electron materials, especially carbon nanotubes, will lay the foundation for developing novel functional, electronic devices in the next generation. 

Durkop, T. Getty, S. A. Cobas, E. Fuhrer, M. S. 2004. Extraordinary mobility in semiconducting carbon nanotubes. Nano Lett. 4 35-39. 

Co-MCM-41 catalyst in H2 at temperatures up to 993 K. It is this intermediate species that preserves the tetrahedral environment in the silica framework and provides the resistance to complete reduction to the metal in the presence of H2. The Co(II) species is resistant to reduction in pure CO the intermediate Co(I) species is more reactive in CO, likely forming cobalt carbonyl-like compounds with high mobility in the MCM-41. These mobile species are the precursors of the metal clusters that grow the carbon nanotubes. Controlling the rates of each step of this two-step reduction process is a key to controlling the sizes of the cobalt metal clusters formed in the cobalt MCM-41 catalysts. 

A method for covalently incorporating Wilkinson s complex onto a multi-walled carbon nanotube is described. Semiconductor carbon nanotubes derived from these materials had mobilities and transconductance properties that were superior to those of existing semiconductors. 

Liier L, Hoseinkhani S, Polli D, Crochet J, Hertel T, Lanzani G (2009) Size and mobility of excitons in (6, 5) carbon nanotubes. Nat Phys 5 54... 

Carbon nanotubes these offer very high mobilities, but difficulties remain in fabricating devices without large shunt losses (Kymakis et al, 2003). 

The rotational barrier associated with zinc was 1.67 kJ mol and with BDC 1 kJ mol, higher than single-walled carbon nanotubes (0.105 kJ mof ). The width of the rotational band (4 cm ) was much less than for carbon (20 cm ) showing a lower dihydrogen mobility and hence stronger binding in [Zii4(BDC)30] than carbon. 

The concept of single-file diffusion has most successfully been applied for MD simulations in carbon nanotubes [36-39], yielding both the square-root time dependence of the molecular mean square displacement and a remarkably high mobility of the individual, isolated diffusants. In [40-42], the astonishingly high single-particle mobilities in single-file systems have been attributed by MD simulations to a concerted motion of clusters of the adsorbed molecules. 

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