Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 8, Pages 9824-9832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22676
Keywords
liquid metal; hydrogel; sensor; biosignal detection; healable electronics
Funding
- Construction Technology Research Project [18SCIP-B146646-01]
- Ministry of Land, Infrastructure and Transport, Korea
- Korea Agency for Infrastructure Technology Advancement (KAIA) [146647] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 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.
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