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12 Mar 2001

Volume 78, Issue 11, pp. 1463-1639

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Production and measurements of individual single-wall nanotubes and small ropes of carbon

Sivaram Arepalli, Pavel Nikolaev, William Holmes, and Bradley S. Files

Appl. Phys. Lett. 78, 1610 (2001); http://dx.doi.org/10.1063/1.1352659 (3 pages) | Cited 13 times

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This work focuses on the size and spatial dependence of single-wall carbon nanotubes produced by the pulsed-laser vaporization technique. The study indicates that very long (tens of microns) individual nanotubes form in the vicinity of the target, and subsequently coalesce into bundles. The role of the inner flow tube is confirmed to restrict plume expansion and improve interactions between carbon atoms resulting in nanotube and rope formation. The effect of the flowing buffer gas seems to influence the dispersion of particulate contaminant material in the nanotube product. More particulate matter is produced at lower oven temperatures. © 2001 American Institute of Physics.
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81.07.De Nanotubes
61.46.-w Structure of nanoscale materials
81.16.Mk Laser-assisted deposition

Nanoscale p-n junction fabrication in silicon due to controlled dopant electromigration

Leonid Chernyak and Mikhail Klimov

Appl. Phys. Lett. 78, 1613 (2001); http://dx.doi.org/10.1063/1.1355009 (3 pages)

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An external electric field (up to 106 V/cm) was used for nanoscale p-n junction fabrication in Si doped with Li (Si:Li) in situ in a scanning probe microscope. Creation of nano-p-n junctions was ascribed to the thermally assisted electromigration of Li+ ions. Tunneling I–V spectroscopy provided evidence for a conversion of the electrical conductivity type from p to n. A local temperature increase during an electric field-induced p-n junction fabrication was estimated to be up to 160 °C. © 2001 American Institute of Physics.
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66.30.Qa Electromigration
85.40.Ry Impurity doping, diffusion and ion implantation technology
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
61.72.uf Ge and Si
81.07.Lk Nanocontacts
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