Superconducting MgB₂ Nanohelices Grown on Various Substrates
Masses of superconducting MgB2 nanohelices and nanowires were grown on various substrates by reaction of Mg metal with diborane (B2H6). The growth occurs via a self-catalyzed vapor-liquid-solid (VLS) mechanism. It is postulated that strain in the wires due to the presence of screw dislocations is responsible for the helical morphology. The several hundred micrometer long helices have a range of diameters and pitch and are made up of wires from 50 to 200 nm in diameter. Magnetic measurements indicate that the helices superconduct below~32 K. These nanohelices could be used to manufacture highly flexible superconducting cables or "nanosolenoids".
M. Nath and B. A. Parkinson, "Superconducting MgB₂ Nanohelices Grown on Various Substrates," Journal of the American Chemical Society, vol. 129, no. 37, pp. 11302-11303, American Chemical Society (ACS), Sep 2007.
The definitive version is available at http://dx.doi.org/10.1021/ja072475x
Keywords and Phrases
Boron Derivative; Magnesium Derivative; catalysis; Catalyst; Crystal Structure; Electron Diffraction; Scanning Electron Microscope; Superconductor; Surface Property; X Ray Powder Diffraction
International Standard Serial Number (ISSN)
Article - Journal
© 2007 American Chemical Society (ACS), All rights reserved.