| 초록 |
Conductive failure during the device operation can cause unexpected shutdown of whole electronic devices, ultimately limiting the device lifetime. To solve this problem, various systems to realize healable electrical conductors have been reported; however, rapid, noninvasive, and on-demand healing, factors that are all synergistically required, especially for wearable device applications, still remains challenging. In this study, we propose a light-powered healable electrical conductor (conceptualized as photofluidic diffusional system by azobenzene materials) for simple-, fast-, and easy-to-implement wearable devices (e.g., the electrical skin, sensitive to mechanical motion). Contrary to other conductive healing systems such as capsules, heat, water, and mechanical forces, green light even with relatively low intensity has potential to provide repetitive recovery of a damaged electrical conductive pathway without any direct invasion and within a few minutes (less than 3 min). Also, the multiple cracks resulting from vigorous motions of wearable devices can be simultaneously recovered regardless of the light incident angles and crack propagation directions, thus, making light-powered healing more accessible to wearable devices beyond existing system options. To develop and demonstrate the key concepts of this system, combined studies on materials, integrations, and light-powering strategy for recovering a damaged wearable electrical conductor are systematically carried out in the present work. |
