ZHU Wenhu1,†, SUN Fenglin1,†, WANG Rong1, JOO SangWoo4, CONG Chenhao2,3,*, LI Xinlin1,*
1 College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, Shandong, China 2 School of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea 3 Qingrou (Qingdao) Intelligent Technology Co.,Ltd., Qingdao 266071, Shandong, China 4 School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
Abstract: With the rapid development of the field of great health, flexible electrodes have attracted much attention as the most basic functional unit on human wearable devices. However, most of the electrodes still have the characteristics of limited stretching degree and poor conductivity, which restrains their practical application. In this paper, a hydrogel-based and multi-hydrogen-bond-containing conductive ink for screen printing technology was prepared using polyvinyl alcohol (PVA) as the conductive hydrogel matrix, poly(3, 4-ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT:PSS) as the conductive network, water as the solvent, and tannic acid (TA) as the cross-linking agent. And a complex physical network structure was subsequently constructed using ice crystals as the templates and freeze-thaw cycling technique. Further the stretchable electrode was prepared through screen printing technique using the polydimethylsiloxane (PDMS) substrate whose surface was hydrophilically pre-modified by sodium dodecyl sulfate (SDS). The eventually produced TA-PVA/PEDOT:PSS hydrogel electrode exhibited a ultimate tensile strain of 480%. In addition, the idea of constructing this multiple hydrogen bonding system has the potential to be extended for application to other self-healing conductive hydrogel electrodes.
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2025, Vol. 39 
