Air-stable, surface-oxide free Cu nanoparticles for highly conductive Cu ink and their application to printed graphene transistors
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- Air-stable, surface-oxide free Cu nanoparticles for highly conductive Cu ink and their application to printed graphene transistors
- Jeong, Sunho; Lee, Su Hyeon; Jo, Yejin; Lee, Sun Sook; Seo, Yeong-Hui; Ahn, Byeong Wan; Kim, Gyeomuk; Jang, Gun-Eik; Park, Jang-Ung; Ryu, Beyong-Hwan; Choi, Youngmin
- Capping molecules; Chemical interactions; Graphene transistors; Ink-jet technique; Printed electronics; Solution-processed; Surface oxide layer; Surface protection
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY C, v.1, no.15, pp.2704 - 2710
- 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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