Carbon-Nanotube-Templated, Sputter-Deposited, Flexible Superconducting NbN Nanowire Yarns

Jeong Gyun Kim, Haeyong Kang, Yourack Lee, Jeongmin Park, Joonggyu Kim, Thuy Kieu Truong, Eun Sung Kim, Doo Hyun Yoon, Young Hee Lee, Dongseok Suh

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Flexible superconducting yarns consisting of sputter-deposited NbN nanowires on highly aligned carbon nanotube (CNT) array sheets are reported. In the microscopic view, the NbN nanowires are formed on top of individual CNT fibrils, and the superconductivity property of the twist-spun NbN–CNT yarn system is comparable to that of a typical NbN thin film on a normal solid substrate. Because of its intrinsic porosity, the system exhibits superior mechanical flexibility with a small bending radius. It also remains a superconducting state even when subjected to severe mechanical deformations, primarily due to the proximity superconductivity through carbon nanotube bundles. The results demonstrate the possibility of fabricating flexible superconducting yarns in a conventional thin-film deposition process, using ultraflexible free-standing CNT sheets as a template. In addition, preliminary tests on reducing the normal-state resistance toward superconducting cable applications are presented.

Original languageEnglish
Article number1701108
JournalAdvanced Functional Materials
Issue number30
StatePublished - 11 Aug 2017

Bibliographical note

Funding Information:
J.-G.K. and H.K. contributed equally to this work. The authors thank Dr. Jiong Zhao for his discussion about the TEM data. This work was supported by the Institute for Basic Science (IBS-R011-D1) (Y.H.L.) and by the National Research Foundation of Korea (NRF-2016R1A2B2012336) (D.S.), funded by the Ministry of Science, ICT & Future Planning, Republic of Korea.

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • NbN nanowires
  • carbon nanotube sheets
  • flexible superconducting yarns
  • superconducting niobium nitrides


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