Universal assembly of liquid metal particles in polymers enables elastic printed circuit board

• DOI: 10.1126/science.abo6631
• Publication Date: 2022-11-10T18:58:42Z
• Authors: Wonbeom Lee; Hyunjun Kim; Inho Kang; Hongjun Park; Jiyoung Jung; Haeseung Lee; Hyunchang Park; Ji Su Park; Jong Min Yuk; Seunghwa Ryu; Jae-Woong Jeong; Jiheong Kang
• Keywords: Stretchable electronics; Flexible Electronics; Liquid metal; Particle (ecology)

An elastic printed circuit board (E-PCB) is a conductive framework used for the facile assembly of system-level stretchable electronics. E-PCBs require conductors that have high conductivity, stretchability, tough adhesion to various components, and imperceptible resistance changes even under large strain. We present liquid metal particle network (LMPNet) assembled by applying an acoustic field solid-state insulating composite as conductor. The LMPNet conductor satisfies all aforementioned requirements enables fabrication multilayered high-density E-PCB, in which numerous electronic components are intimately integrated create highly skin Furthermore, we could generate polymer matrices, including hydrogels, self-healing elastomers, photoresists, thus showing their potential use soft