ka
Fig. 8. Splitting of the DOS in zigzag nanotubes. Two minimum energy positions are found in the conduction band for zigzag nanotubes, n, 0 measured from the energy at the K point. Open circles denote metallic carbon nanotubes for k K1 vectors away from the K point along the K M and K r lines, which are the directions of the energy minima see Fig. 6 . The inset shows an expanded view of the figure at small E yo and small ka for semiconducting nanotubes. The closed circles denote semiconducting...
Applications in Chemical Force Microscopy and Force Spectroscopy
In Chemical Force Microscopy CFM , the AFM tip is modified with specific chemical functional groups 90 . This enables the tip to generate contrast dependent on the chemical properties of the sample from the friction signal in contact mode or the phase lag signal in tapping mode simultaneously with topography 91 . Functionalized tips have also been employed in force spec-troscopy. In this mode of operation the tip is brought into contact with a surface, then retracted. The forces applied to the...
References Pis
1. S. Iijima, Nature 354, 56 1991 55 2. T. W. Ebbesen and P. M. Ajayan, Nature 358, 220 1992 55 3. S. Iijima, T. Ichihashi, Nature 363, 603 1993 55, 67 4. D. S. Bethune, C. H. Kiang, M. S. de Vries, G. Gorman, R. Savoy, J. Vazquez, R. Beyers, Nature 363, 605 1993 55 5. A. Thess, R. Lee, P. Nikolaev, H. Dai, P. Petit, J. Robert, C. Xu, Y. H. Lee, S. G. Kim, D. T. Colbert, G. Scuseria, D. Tomanek, J. E. Fischer, R. E. Smalley, Science 273, 483 1996 56, 67, 69, 70, 72, 73, 78 6. C. Journet, W. K....
Resonance Raman Scattering of MWNTs
Multi-walled carbon nanotubes MWNTs prepared by the carbon arc method are thought to be composed of a coaxial arrangement of concentric nanotubes. For example, 13C-NMR 64 and magnetoresistance measurements 65,66 show Aharonov-Bohm effects that are associated with the concentric tube structures. On the other hand, the thermal expansion measurements 67 and the doping effects 68 suggest that some kinds of MWNTs have scroll structures. If the RBMs, which are characteristic of SWNTs 35 , are...
References Gnt
1. M. S. Dresselhaus, G. Dresselhaus, Science of Fullerenes and Carbon Nanotubes Academic, San Diego 1996 173, 179 2. B. I. Yakobson, R. E. Smalley, Amer. Sci. 85, 324 1997 173 3. C. Dekker, Phys. Today 52, 22 1999 173 4. M. M. J. Treacy, T. W. Ebbesen, J. M. Gibson, Nature 381, 678 1996 173, 197 5. E. W. Wong, P. E. Sheehan, C. M. Lieber, Science 277, 1971 1997 173, 192, 194, 197, 198 B. I. Yakobson, C. J. Brabec, J. Bernholc, Phys. Rev. Lett.76, 2511 1996 173 N. Hamada, S. Sawada, A....