Kang Jeong Eun, Jeong Myeong Hoon, Choi Kyoung Jin
Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
ACS Omega. 2025 Apr 9;10(15):14738-14744. doi: 10.1021/acsomega.4c08898. eCollection 2025 Apr 22.
With the growing interest in wearable or stretchable electronics, research on stretchable electrodes has also been active. Generally, metal electrodes have high conductivity but very low stretchability, while organic electrodes have high stretchability but lower conductivity than metals. In this paper, metal/organic hybrid electrodes were fabricated on elastic poly(dimethylsiloxane) (PDMS) substrates to take advantage of the high conductivity of metals and the high stretchability of organic semiconductors. Additionally, by prestraining the PDMS substrate, the stretchability of the electrodes was further increased. However, the uniaxially prestrained electrodes produced compressive stresses in the direction perpendicular to the stretching direction due to Poisson's effect, resulting in many cracks. To solve this problem, biaxial prestrain was introduced to the PDMS substrate. The electrodes fabricated with uniaxial prestrain exhibited a structure with wrinkles aligned in one dimension, whereas the electrodes with biaxial prestrain displayed highly ordered, two-dimensional wrinkle patterns arranged on the electrode surface. The electrodes with biaxial prestrain maintained stable electrical performance even after 200 cycles of stretching at a strain of 50%, withstanding up to 130% strain. Furthermore, of all the poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT:PSS)-based electrodes reported so far, our electrode showed the lowest sheet resistance of 0.91 Ω/sq. The strategy of our study offers promising opportunities for integrated wearable devices.
随着对可穿戴或可拉伸电子产品的兴趣日益浓厚，对可拉伸电极的研究也十分活跃。一般来说，金属电极具有高导电性但拉伸性极低，而有机电极具有高拉伸性但导电性低于金属。在本文中，在弹性聚二甲基硅氧烷（PDMS）基板上制备了金属/有机混合电极，以利用金属的高导电性和有机半导体的高拉伸性。此外，通过对PDMS基板进行预拉伸，电极的拉伸性进一步提高。然而，由于泊松效应，单轴预拉伸电极在垂直于拉伸方向上产生压应力，导致出现许多裂纹。为了解决这个问题，对PDMS基板引入了双轴预拉伸。单轴预拉伸制备的电极呈现出一维排列的皱纹结构，而双轴预拉伸的电极在电极表面显示出高度有序的二维皱纹图案。双轴预拉伸的电极即使在50%应变下进行200次拉伸循环后仍保持稳定的电性能，可承受高达130%的应变。此外，在目前报道的所有基于聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）的电极中，我们的电极显示出最低的方阻，为0.91Ω/sq。我们的研究策略为集成可穿戴设备提供了广阔的前景。
