Multigram Synthesis of Cu-Ag Core–Shell Nanowires Enables the Production of a Highly Conductive Polymer Filament for 3D Printing Electronics


Journal Article

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim This article reports a synthesis that yields 4.4 g of Cu nanowires in 1 h, and a method to coat 22 g of Cu nanowires with Ag within 1 h. Due to the large diameters of Cu nanowires (≈240 nm) produced by this synthesis, a Ag:Cu mol ratio of 0.04 is sufficient to coat the nanowires with ≈3 nm of Ag, and thereby protect them from oxidation. This multigram Cu-Ag core–shell nanowire production process enabled the production of the first nanowire-based conductive polymer composite filament for 3D printing. The 3D printing filament has a resistivity of 0.002 Ω cm, >100 times more conductive than commercially available graphene-based 3D printing filaments. The conductivity of composites containing 5 vol% of 50-µm-long Cu-Ag nanowires is greater than composites containing 22 vol% of 20-µm-long Ag nanowires or 10-µm-long flakes, indicating that high-aspect ratio Cu-Ag nanowires enable the production of highly conductive composites at relatively low volume fractions. The highly conductive filament can support current densities between 2.5 and 4.5 × 105 A m−2 depending on the surface-to-volume ratio of the printed trace, and was used to 3D print a conductive coil for wireless power transfer.

Full Text

Duke Authors

Cited Authors

  • Cruz, MA; Ye, S; Kim, MJ; Reyes, C; Yang, F; Flowers, PF; Wiley, BJ

Published Date

  • May 1, 2018

Published In

Volume / Issue

  • 35 / 5

Electronic International Standard Serial Number (EISSN)

  • 1521-4117

International Standard Serial Number (ISSN)

  • 0934-0866

Digital Object Identifier (DOI)

  • 10.1002/ppsc.201700385

Citation Source

  • Scopus