Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 1, Issue 15, Pages 2704-2710Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc00904a
Keywords
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Funding
- Industrial Core Technology Development Program
- Ministry of Knowledge Economy [10031709]
- Korea Research Institute of Chemical Technology (KRICT)
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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 mu Omega cm, comparable to the resistivity of noble metal-based, solution-processed counterparts. In addition, high resolution Cu electrode patterns with 5 mu m line-width are directly printed using an electrohydrodynamic inkjet technique, and graphene transistors with the printed Cu electrodes demonstrate potential applications in printed electronics.
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