Synthesis of oxidation-resistant core-shell copper nanoparticles

Inhyuk Kim, Youngwoo Kim, Kyoohee Woo, Eui Hyun Ryu, Kyung Yol Yon, Guozhong Cao, Jooho Moon

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We present a simple method to synthesize non-oxidizable copper nanoparticles surrounded by copper formate. The formation of the core-shell nanoparticles was achieved via surface reaction induced by the injection of formic acid on the preformed core particles. High resolution transmission electron microscopy revealed that copper particles with a diameter of 77 nm are conformally surrounded by a 5 nm thick layer of copper formate, which prevents oxidation of the copper. This non-metallic shell was readily reduced to Cu during low temperature annealing without leaving behind organic residues, resulting in highly conductive films with a resistivity of 13.5 μΩ cm after annealing at 250°C for 1 h in nitrogen. Time- and temperature- dependent sheet resistance measurements demonstrated that the resistivity of the core-shell nanoparticle films will double after exposure to an ambient atmosphere at room temperature for 27 years. Our core-shell Cu nanoparticles are a promising and cost-effective alternative to silver nanoparticles for the efficient production of printed conductors with enhanced chemical stability.

Original languageEnglish
Pages (from-to)15169-15177
Number of pages9
JournalRSC Advances
Volume3
Issue number35
DOIs
Publication statusPublished - 2013 Sep 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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    Kim, I., Kim, Y., Woo, K., Ryu, E. H., Yon, K. Y., Cao, G., & Moon, J. (2013). Synthesis of oxidation-resistant core-shell copper nanoparticles. RSC Advances, 3(35), 15169-15177. https://doi.org/10.1039/c3ra41480a