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 journalArticlepeer-review

54 Citations (Scopus)


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
Issue number35
Publication statusPublished - 2013 Sept 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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