Hong Jin-Yong, Kim Wook, Choi Dukhyun, Kong Jing, Park Ho Seok
School of Chemical Engineering, Sungkyunkwan University , Suwon 440-746, Korea.
Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
ACS Nano. 2016 Oct 25;10(10):9446-9455. doi: 10.1021/acsnano.6b04493. Epub 2016 Oct 4.
Stretchable and transparent electrodes have been developed for applications in flexible and wearable electronics. For customer-oriented practical applications, the electrical and optical properties of stretchable electrodes should be independent of the directions of the applied stress, and such electrodes are called omnidirectionally stretchable electrodes. Herein, we report a simple and cost-effective approach for the fabrication of omnidirectionally stretchable and transparent graphene electrodes with mechanical durability and performance reliability. The use of a Fresnel lens-patterned electrode allows multilayered graphene sheets to achieve a concentric circular wavy structure, which is capable of sustaining tensile strains in all directions. The as-prepared electrodes exhibit high optical transparency, low sheet resistance, and reliable electrical performances under various deformation (e.g., bending, stretching, folding, and buckling) conditions. Furthermore, computer simulations have also been carried out to investigate the response of a Fresnel lens-patterned structure on the application of mechanical stresses. This study can be significant in a large variety of potential applications, ranging from stretchable devices to electronic components in various wearable integrated systems.
可拉伸透明电极已被开发用于柔性和可穿戴电子设备。对于以客户为导向的实际应用，可拉伸电极的电学和光学性能应与所施加应力的方向无关，这种电极被称为全向可拉伸电极。在此，我们报告了一种简单且经济高效的方法来制造具有机械耐久性和性能可靠性的全向可拉伸透明石墨烯电极。使用菲涅耳透镜图案化电极可使多层石墨烯片实现同心圆形波浪结构，该结构能够承受各个方向的拉伸应变。所制备的电极在各种变形（如弯曲、拉伸、折叠和屈曲）条件下表现出高光学透明度、低表面电阻和可靠的电学性能。此外，还进行了计算机模拟以研究菲涅耳透镜图案化结构在机械应力作用下的响应。这项研究在从可拉伸设备到各种可穿戴集成系统中的电子元件等众多潜在应用中可能具有重要意义。
