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Highly Elastic Graphene‐Based Electronics Toward Electronic Skin
Author(s) -
Yun Yong Ju,
Ju Jongil,
Lee Joong Hoon,
Moon SungHwan,
Park SoonJung,
Kim Young Heon,
Hong Won G.,
Ha Dong Han,
Jang Heeyeong,
Lee Geon Hui,
Chung HyungMin,
Choi Jonghyun,
Nam Sung Woo,
Lee SangHoon,
Jun Yongseok
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201701513
Subject(s) - materials science , graphene , microfabrication , gauge factor , electronics , nanotechnology , strain gauge , flexible electronics , optoelectronics , wearable technology , wearable computer , composite material , computer science , fabrication , electrical engineering , engineering , medicine , alternative medicine , pathology , embedded system
Epidermal electronics are extensively explored as an important platform for future biomedical engineering. Epidermal devices are typically fabricated using high‐cost methods employing complex vacuum microfabrication processes, limiting their widespread potential in wearable electronics. Here, a low‐cost, solution‐based approach using electroconductive reduced graphene oxide (RGO) sheets on elastic and porous poly(dimethylsiloxane) (PDMS) thin films for multifunctional, high‐performance, graphene‐based epidermal bioelectrodes and strain sensors is presented. These devices are fabricated employing simple coatings and direct patterning without using any complicated microfabrication processes. The graphene bioelectrodes show a superior stretchability (up to 150% strain), with mechanical durability up to 5000 cycles of stretching and releasing, and low sheet resistance (1.5 kΩ per square), and the graphene strain sensors exhibit a high sensitivity (a gauge factor of 7 to 173) with a wide sensing range (up to 40% strain). Fully functional applications of dry bioelectrodes in monitoring human electrophysiological signals (i.e., electrocardiogram, electroencephalography, and electromyogram) and highly sensitive strain sensors for precise detection of large‐scale human motions are demonstrated. It is believed that our unique processing capability and multifunctional device platform based on RGO/porous PDMS will pave the way for low‐cost processing and integration of 2D materials for future wearable electronic skin.