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Issue 15, 2013
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Air-stable, surface-oxide free Cu nanoparticles for highly conductive Cu ink and their application to printed graphene transistors

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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.

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

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Publication details

The article was received on 21 Dec 2012, accepted on 13 Feb 2013 and first published on 13 Feb 2013


Article type: Paper
DOI: 10.1039/C3TC00904A
Citation: J. Mater. Chem. C, 2013,1, 2704-2710

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

    S. Jeong, S. H. Lee, Y. Jo, S. S. Lee, Y. Seo, B. W. Ahn, G. Kim, G. Jang, J. Park, B. Ryu and Y. Choi, J. Mater. Chem. C, 2013, 1, 2704
    DOI: 10.1039/C3TC00904A

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