Self-Healable Hydrogel-Liquid Metal Composite Platform Enabled by a 3D Printed Stamp for a Multimodular Sensor System

Yoon Young Choi, Dong Hae Ho, Jeong Ho Cho

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


Hydrogels and liquid metals have been emerging as potential materials for use in self-healing electronics. This paper presents a simple fabrication procedure for a custom-designed hydrogel-liquid metal composite and its various applications. The hydrogel is patterned using three-dimensional printed molds for creating an electrical pathway, which is subsequently filled with liquid metal. The lifetime and self-healing property of the hydrogel improve drastically through coating of its surface with a moisture protectant layer and via the formation of an oxidized layer of liquid metal, respectively. Three joined units of the resulting hydrogel-liquid metal composite are successfully applied as self-healable electrodes in a customizable multimodular sensor system consisting of a photoresistor, a thermistor, and a tilt switch. The composite is also used as an electrode for biosignal (electromyogram, electrocardiogram, and electrodermal activity) detection, and its sensing ability is found to be comparable to that of a conventional Ag/AgCl electrode. The demonstrated hydrogel-liquid metal composite provides wide scope for researchers to achieve practical advances in self-healing electronics.

Original languageEnglish
Pages (from-to)9824-9832
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number8
Publication statusPublished - 2020 Feb 26

Bibliographical note

Funding Information:
This work was supported by the Construction Technology Research Project (Grant No. 18SCIP-B146646-01) funded by the Ministry of Land, Infrastructure and Transport, Korea.

Publisher Copyright:
Copyright © 2020 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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