A Personalized Electronic Tattoo for Healthcare Realized by On-the-Spot Assembly of an Intrinsically Conductive and Durable Liquid-Metal Composite

Gun Hee Lee, Heejin Woo, Chanwoong Yoon, Congqi Yang, Jae Young Bae, Wonsik Kim, Do Hoon Lee, Heemin Kang, Seungmin Han, Seung Kyun Kang, Seongjun Park, Hyung Ryong Kim, Jae Woong Jeong, Steve Park

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Conventional electronic (e-) skins are a class of thin-film electronics mainly fabricated in laboratories or factories, which is incapable of rapid and simple customization for personalized healthcare. Here a new class of e-tattoos is introduced that can be directly implemented on the skin by facile one-step coating with various designs at multi-scale depending on the purpose of the user without a substrate. An e-tattoo is realized by attaching Pt-decorated carbon nanotubes on gallium-based liquid-metal particles (CMP) to impose intrinsic electrical conductivity and mechanical durability. Tuning the CMP suspension to have low-zeta potential, excellent wettability, and high-vapor pressure enables conformal and intimate assembly of particles directly on the skin in 10 s. Low-cost, ease of preparation, on-skin compatibility, and multifunctionality of CMP make it highly suitable for e-tattoos. Demonstrations of electrical muscle stimulators, photothermal patches, motion artifact-free electrophysiological sensors, and electrochemical biosensors validate the simplicity, versatility, and reliability of the e-tattoo-based approach in biomedical engineering.

Original languageEnglish
Article number2204159
JournalAdvanced Materials
Volume34
Issue number32
DOIs
Publication statusPublished - 2022 Aug 11

Bibliographical note

Funding Information:
G.‐H.L. and H.W. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF‐2017M3A9E4047243, NRF‐2022R1A2C2006076, NRF‐2022M3E5E9017759, and NRF‐2020R1C1C1007589). The research has been conducted as part of the KAIST UP Program.

Funding Information:
G.-H.L. and H.W. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF-2017M3A9E4047243, NRF-2022R1A2C2006076, NRF-2022M3E5E9017759, and NRF-2020R1C1C1007589). The research has been conducted as part of the KAIST UP Program.

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • bioelectronics
  • electronic tattoos
  • liquid-metal particles
  • personalized healthcare
  • solution processing

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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