Newly Designed Cu/Cu 10 Sn 3 Core/Shell Nanoparticles for Liquid Phase-Photonic Sintered Copper Electrodes: Large-Area, Low-Cost Transparent Flexible Electronics

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Chemistry of Materials, ISSN: 0897-4756, Vol: 28, Issue: 13, Page: 4714-4723

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Oh, Sang-Jin, Kim, Tae Gon, Kim, So-Yun, Jo, Yejin, Lee, Sun Sook, Kim, Kukjoo, Ryu, Beyong-Hwan, Park, Jang-Ung, Choi, Youngmin, Jeong, Sunho
American Chemical Society (ACS), AMER CHEMICAL SOC
Chemistry, Chemical Engineering, Materials Science, Conductive materials, Copper, Cost effectiveness, Flexible electronics, Nanoparticles, Sintering, Synthesis (chemical), Tin, Touch screens Conductive electrodes, Core/shell nanoparticles, Cu-based electrodes, Electrode fabrication, Electrode material, Polyethylene naphthalate, Printing techniques, Wireless power transmission
article description
The conductive nanomaterials applicable to unconventional printing techniques have attracted a great deal of attention, and in particular, cost-effective copper-based electrode materials have been recognized as viable candidates for replacement of the expensive silver counterpart. In this study, we synthesize newly designed Cu/CuSn core/shell nanoparticles, as an additive material for overcoming the critical drawbacks in Cu nanoparticle-based electrodes, in combination with a large-area processable, continuous photonic sintering process on a time scale of 10 s. By virtue of the low-melting point nature of the CuSn phase, the facile electrode fabrication process is easily triggered, yielding resistivities of 27.8 and 12.2 μω cm under energy dose conditions of 0.97 and 1.1 J/cm, respectively, at which highly conductive electrodes cannot be obtained from phase-pure Cu nanoparticles. The suspension mixture of Cu and Cu/CuSn nanoparticles permits roll-to-roll processable, highly uniform Cu-based electrodes (with a sheet resistance and a standard deviation of 1.21 and 0.29 ω/square, respectively) even on vulnerable polyethylene naphthalate substrate, while the electrodes derived from CuSn phase-free Cu nanoparticles suffer from nonuniform characteristics and even a partially insulating nature. The practical applicability of Cu/CuSn core/shell nanoparticles is demonstrated with the fabrication of a touch screen panel and an antenna for wireless power transmission.

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