Universal assembly of liquid metal particles in polymers enables elastic printed circuit board.
basic_science · Level V
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- Record sourced from PubMed, PMID 36356149.
- Also identified by DOI 10.1126/science.abo6631.
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Abstract
An elastic printed circuit board (E-PCB) is a conductive framework used for the facile assembly of system-level stretchable electronics. E-PCBs require elastic conductors that have high conductivity, high stretchability, tough adhesion to various components, and imperceptible resistance changes even under large strain. We present a liquid metal particle network (LMP<sub>Net</sub>) assembled by applying an acoustic field to a solid-state insulating liquid metal particle composite as the elastic conductor. The LMP<sub>Net</sub> conductor satisfies all the aforementioned requirements and enables the fabrication of a multilayered high-density E-PCB, in which numerous electronic components are intimately integrated to create highly stretchable skin electronics. Furthermore, we could generate the LMP<sub>Net</sub> in various polymer matrices, including hydrogels, self-healing elastomers, and photoresists, thus showing their potential for use in soft electronics.