Air-stable, surface-oxide free Cu nanoparticles for highly conductive Cu ink and their application to printed graphene transistors

Sunho Jeong, Su Hyeon Lee, Yejin Jo, Sun Sook Lee, Yeong Hui Seo, Byeong Wan Ahn, Gyeomuk Kim, Gun Eik Jang, Jang Ung Park, Beyong Hwan Ryu, Youngmin Choi

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Air-stable, surface-oxide free Cu nanoparticles are, for the first time, synthesized by surrounding completely the Cu surface with oleic acid incorporated as a capping molecule. XPS analysis, in conjunction with TEM analysis, revealed that the oleic acid is chemisorbed to the Cu surface via a chemical interaction wherein a monodentate bond is included, without leaving behind free (non-interacting) oleic acid, thereby providing complete surface protection against oxidation. By eliminating the surface oxide layer that critically degrades the electrical properties, the surface-oxide free Cu nanoparticle ink facilitates the realization of a solution-processed Cu electrode layer with resistivity as low as 4 μΩ cm, comparable to the resistivity of noble metal-based, solution-processed counterparts. In addition, high resolution Cu electrode patterns with 5 μm line-width are directly printed using an electrohydrodynamic inkjet technique, and graphene transistors with the printed Cu electrodes demonstrate potential applications in printed electronics.

Original languageEnglish
Pages (from-to)2704-2710
Number of pages7
JournalJournal of Materials Chemistry C
Volume1
Issue number15
DOIs
Publication statusPublished - 2013 Apr 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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    Jeong, S., Lee, S. H., Jo, Y., Lee, S. S., Seo, Y. H., Ahn, B. W., Kim, G., Jang, G. E., Park, J. U., Ryu, B. H., & Choi, Y. (2013). Air-stable, surface-oxide free Cu nanoparticles for highly conductive Cu ink and their application to printed graphene transistors. Journal of Materials Chemistry C, 1(15), 2704-2710. https://doi.org/10.1039/c3tc00904a