Nanotubes single-layer

Fig. I. Field emission dala from a mounted nanotube. An activated nanotube emits a higher current when heated by the laser than when the laser beam is bloeked (a). When aetivated by exposing the nanotube to oxygen while heating the tip, this behavior is reversed, and the emission current increases dramatically when the laser is blocked. The activated state can also be achieved by laser heating while maintaining a bias voltage of —75 V. Note that the scale of the two plots is different the activated current is always higher than the inactivated current. As discussed in the text, these dala led to the conclusion that the emitting feature is a chain of carbon atoms pulled from a single layer of the nanotube —an atomic wire.

Of particular importance to carbon nanotube physics are the many possible symmetries or geometries that can be realized on a cylindrical surface in carbon nanotubes without the introduction of strain. For ID systems on a cylindrical surface, translational symmetry with a screw axis could affect the electronic structure and related properties. The exotic electronic properties of ID carbon nanotubes are seen to arise predominately from intralayer interactions, rather than from interlayer interactions between multilayers within a single carbon nanotube or between two different nanotubes. Since the symmetry of a single nanotube is essential for understanding the basic physics of carbon nanotubes, most of this article focuses on the symmetry properties of single layer nanotubes, with a brief discussion also provided for two-layer nanotubes and an ordered array of similar nanotubes. 

CARBON NANOTUBES WITH SINGLE-LAYER WALLS... 

Some other results fall in between or outside these main groups. In the case of nickel, in addition to long, straight nanotubes in the soot, shorter single-layer... 

Parameter studies have shown that single-layer nanotubes can be produced by the arc method under a wide range of conditions, with large variations in variables such as the buffer gas pressure (100-500 Torr), gas flow rate, and metal concentration in the... 

Carbon nanotubes with single-layer walls... 

Fig. 2a. Bundles and individual single-layer carbon nanotubes bridge across a gap in a carbon film.

Fig. 2c. Aggregated single-layer nanotubes from soot produeed by co-vaporizing Co and Bi.

Bissett, M.A., et al., Dendron growth from vertically aligned single-watted carbon nanotube thin layer arrays for photovoltaic devices. Physical Chemistry Chemical Physics, 2011.13(13) p. 6059-6064. 

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