Nanogallery
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TODAY DECEMBER 12, 2018

Superconductivity of nanowires produced by metal decoration of carbon nanotubes

The picture shows a superconducting MoGe nanowire (gray line) produced by sputter-coating a single-wall carbon nanotube placed across a deep trench etched into the substrate
The left picture shows a superconducting MoGe nanowire (gray line) produced by sputter-coating a single-wall carbon nanotube placed across a deep trench etched into the substrate.
The left picture shows a superconducting MoGe nanowire (gray line) produced by sputter-coating a single-wall carbon nanotube placed across a deep trench etched into the substrate. The trench appears black in the picture. The wire shown on the picture is about 8 nm in diameter. The smallest diameter that was obtain reliably with this method is 5 nm. A quantum superconductor-insulator (SI) transition is found in ultrathin superconducting nanowires of this type. The plots on the right show the measurements on a series of nanowires of various thickness. An SI transition is seen. The transition occurs when the normal resistance of the wire reached the quantum resistance for Cooper pairs, i.e. Rq=h/4e2~6.45 kW.


1. A. Bezryadin, Superconductivity in nanowires: Fabrication and quantum transport (Wiley-VCH, October 2012).
2. A. Bezryadin, C.N. Lau, and M. Tinkham, "Quantum suppression of superconductivity in ultrathin nanowires," Nature 404, 971974 (2000).
See also images:

The cylindrical superstructures are composed of silver nanoparticles with V-shaped amphiphilic arms. The short rod-like and spherical assemblies are made of gold nanoparticles with the same V-shaped amphiphilic arms.  The self-assembly occurs upon slow addition of water to solution of nanoparticles in organic solvent called tetrahydrofuran. The resulting mixture is then dialyzed against pure water in order to remove organic solvent and obtain a pure aqueous solution of the superstructures (they remain in water without any precipitation, just like micelles).
Nanowerk Nanotechnology Portal
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Nanohedron
http://www.nanohedron.com

Biomolecules
http://perso.curie.fr/Simon.Sc..


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