| 학회 | 한국재료학회 |
| 학술대회 | 2019년 가을 (10/30 ~ 11/01, 삼척 쏠비치 호텔&리조트) |
| 권호 | 25권 2호 |
| 발표분야 | G. 나노/박막 재료 분과 |
| 제목 | Plasmonic-Tuned Flash Cu Nanowelding with Ultrafast Interlocking on Flexible Plastics |
| 초록 | Flexible electronics have the potential to create a paradigm shift in healthcare monitoring, conformal photovoltaics and wireless communication devices. To draw on the widespread application of flexible devices, stretchable electrodes have been extensively developed using metal nanoparticles, metal nanowires, carbon nanotubes etc. However, challenges like, complication in encapsulation and transfer processes, large interconnection area and limited stretchability have hindered the widespread application of present conductors. Light-material interactions for flexible systems (e.g., inorganic-based laser lift-off, photoreduction, light sintering and low temperature polycrystalline silicon) have attracted considerable attention as a powerful solution for conducting electrodes on plastics. Monochromatic lasers have been used to demonstrate the plasmonic welding of flexible conductors, but they fall short in terms of conductivity, high roughness and lack of mass productivity. Flash lamp can be an excellent alternative for lasers, considering the economical high productivity. Herein, a novel stretchable Copper conductor with excellent conductivity and stretchability via flash-induced multiscale tuning between Copper and an elastomer interface is reported. The flash-induced instantaneous photoreduction of Copper oxide nanoparticles to Copper nanoparticles and subsequent welding leads to outstanding conductivity (≈37 kS cm−1) of the buckled elastic electrode. Microscale-randomly wrinkled Copper is formed on an elastomer substrate through a single pulse of a millisecond flash light, enabling the elongation of Copper to exceed 20% regardless of the stretching direction. The nanoscale interlocked interface between the Copper nanoparticles (NPs) and the elastomer increases the adhesion force of Copper, which contributes to a significant improvement of the Copper stability and stretchability under harsh yielding stress. The 3D structure of randomly wrinkled Copper is modelled by finite element analysis simulations to show that the flash-activated stretchable Copper conductors can endure strain over 20% in all directions. Finally, the wrinkled Copper is utilized for wireless near-field communication on the skin of human wrist. |
| 저자 | Abani1, keon Jae Lee2 |
| 소속 | 1Department of Materials Science and Engineering, 2KAIST |
| 키워드 | <P>light-material interaction; Plasmonic-tuned; flexible electrode; Cu electrode</P> |
