N2 - We have proposed a new method for in-situ doping of multiwall carbon nanotubes (MWCNTs) by catalytic CVD using nickel boron (NiB) as the catalyst. Raman spectrum measurements were carried out to determine the effects of doping using NiB catalysts with different B-concentrations at different CVD temperatures. The characteristic shifts in the Raman spectra which indicate carrier doping were demonstrated for the NiB catalyst with 18 atomic % B at the CVD temperature of 900°C. The CNT crystallinity was improved by a new catalyst structure with a B-capping layer over the NiB catalyst.
Carbon nanotubes can perform as a catalyst in a fuel cell, avoiding the use of expensive platinum on which most catalysts are based. Researchers have found that incorporating nitrogen and iron atoms into the carbon lattice of nanotubes results in .
A carbon nanotube with closed ends.
Another type of nanotube has closed ends, formed by some of the carbon atoms combining into pentagons on the end of the nanotube, as shown in the following figure.
Template Synthesis of Nano Test Tubes - Nano Letters …
A significant nanoparticle discovery that came to light in 1991 was carbon nanotubes. Where buckyballs are round, nanotubes are cylinders that haven’t folded around to create a sphere. Carbon nanotubes are composed of carbon atoms linked in hexagonal shapes, with each carbon atom covalently bonded to three other carbon atoms. Carbon nanotubes have diameters as small as 1 nm and lengths up to several centimeters. Although, like buckyballs, carbon nanotubes are strong, they are not brittle. They can be bent, and when released, they will spring back to their original shape.
Template Synthesis of Nano Test Tubes
The properties of nanotubes have caused researchers and companies to consider using them in several fields. For example, because carbon nanotubes have the highest strength-to-weight ratio of any known material, researchers at NASA are combining carbon nanotubes with other materials into composites that can be used to build lightweight spacecraft.
Facile Decoring Route to Carbon Nano Test Tubes.
Carbon nanotubes can occur as multiple concentric cylinders of carbon atoms, called multi-walled carbon nanotubes (MWCTs) and shown in the following figure. Logically enough, carbon nanotubes that have only one cylinder are called single-walled carbon nanotubes (SWCTs). Both MWCT and SWCT are used to strengthen composite materials.
Nanotube Applications and Uses - carbon nano tubes
Researchers at North Carolina State University have demonstrated the use of for Li-ion batteries. They are predicting that the use of silicon can increase the capacity of Li-ion batteries by up to 10 times. However silicon expands during a batteries discharge cycle, which can damage silicon based anodes. By depositing silicon on nanotubes aligned parallel to each other the researchers hope to prevent damage to the anode when the silicon expands.