2. Academic Validation
  3. Ultrathin Hydrogel Films Toward Breathable Skin-Integrated Electronics

Ultrathin Hydrogel Films Toward Breathable Skin-Integrated Electronics

  • Adv Mater. 2022 Oct 20;e2206793. doi: 10.1002/adma.202206793.
Simin Cheng 1,  Zirui Lou 1,  Lan Zhang 2,  Haotian Guo 1,  Zitian Wang 1,  Chuanfei Guo 3,  Kenjiro Fukuda 4,  Shaohua Ma 1,  Guoqing Wang 2,  Takao Someya 4 5,  Hui-Ming Cheng 6 7,  Xiaomin Xu 1
Affiliations

Affiliations

  • 1 Shenzhen International Graduate School & Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, 518055, China.
  • 2 College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China.
  • 3 Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
  • 4 Center for Emergent Matter Science & Thin-Film Device Laboratory, RIKEN, Saitama, 351-0198, Japan.
  • 5 Electrical and Electronic Engineering and Information Systems, The University of Tokyo, Tokyo, 113-8656, Japan.
  • 6 Faculty of Materials Science and Engineering, Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
  • 7 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China.
PMID: 36267034 DOI: 10.1002/adma.202206793
Abstract

On-skin electronics that offer revolutionary capabilities in personalized diagnosis, therapeutics, and human-machine interfaces require seamless integration between the skin and electronics. A common question remains whether an ideal interface can be introduced to directly bridge thin-film electronics with the soft skin, allowing the skin to breathe freely and the skin-integrated electronics to function stably. Here we report an ever-thinnest hydrogel that is compliant to the glyphic lines and subtle minutiae on the skin without forming air gaps, produced by a facile cold-lamination method. The hydrogels exhibit high water-vapor permeability, allowing nearly unimpeded transepidermal water loss and free breathing of the skin underneath. We demonstrate hydrogel-interfaced flexible (opto)electronics without causing skin irritation or accelerated device performance deterioration. The long-term applicability was recorded for over one week. With combined features of extreme mechanical compliance, high permeability, and biocompatibility, the ultrathin hydrogel interface will promote the general applicability of skin-integrated electronics. This article is protected by copyright. All rights reserved.

Keywords

flexible (opto)electronics; mechanical compliance; skin-integrated electronics; ultrathin hydrogel; water-vapor permeability.

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