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Research Article | Open Access

Suspended superconducting weak links from aerosol-synthesized single-walled carbon nanotubes

Jukka-Pekka Kaikkonen1( ), Abhilash Thanniyil Sebastian1, Patrik Laiho3, Nan Wei3, Marco Will1,2, Yongping Liao3, Esko I. Kauppinen3, Pertti J. Hakonen1,2( )
Low Temperature Laboratory, Department of Applied Physics, School of Science, Aalto University, PO Box 15100, FI-00076 Aalto, Finland
QTF Centre of Excellence, Department of Applied Physics, School of Science, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland
Department of Applied Physics, School of Science, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland
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An erratum to this article is available online at:
https://doi.org/10.1007/s12274-020-3110-4

Graphical Abstract

Abstract

We report a new scheme for fabrication of clean, suspended superconducting weak links from pristine single-walled carbon nanotubes (SWCNT). The SWCNTs were grown using the floating-catalyst chemical vapour deposition (FC-CVD) and directly deposited on top of prefabricated superconducting molybdenum-rhenium (MoRe) electrodes by thermophoresis at nearly ambient conditions. Transparent contacts to SWCNTs were obtained by vacuum-annealing the devices at 900 °C, which enabled proximity-induced supercurrents up to 53 nA. SWCNT weak links fabricated on MoRe/palladium bilayer sustained supercurrents up to 0.4 nA after annealing at relatively low temperature of 220 °C. The fabrication process does neither expose SWCNTs to lithographic chemicals, nor the contact electrodes to the harsh conditions of in situ CVD growth. Our scheme facilitates new experimental possibilities for hybrid superconducting devices.

Keywords

carbon nanotubeJosephson junctionfloating catalyst chemical vapour depositionthermophoresiselectrical transport

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Nano Research
Volume 13 Issue 12,
December 2020
Pages 3433-3438
DOI: 10.1007/s12274-020-3032-1
Cite this article:
Kaikkonen J-P, Sebastian AT, Laiho P, et al. Suspended superconducting weak links from aerosol-synthesized single-walled carbon nanotubes. Nano Research, 2020, 13(12): 3433-3438. https://doi.org/10.1007/s12274-020-3032-1
Topics:
Binary alloysChemical vapor depositionElectrodesNanotubesRhodium alloysSingle walled carbon nanotubes (SWCN)Temperature

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Received: 16 January 2020
Revised: 04 August 2020
Accepted: 04 August 2020
Published: 03 September 2020
© The Author(s) 2020

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