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Wireless Monitoring Using a Stretchable and Transparent Sensor Sheet Containing Metal Nanowires
Author(s) -
Araki Teppei,
Uemura Takafumi,
Yoshimoto Shusuke,
Takemoto Ashuya,
Noda Yuki,
Izumi Shintaro,
Sekitani Tsuyoshi
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201902684
Subject(s) - materials science , stretchable electronics , wireless sensor network , biosignal , miniaturization , wireless , nanotechnology , electronics , transparency (behavior) , computer science , electrical engineering , engineering , telecommunications , computer network , computer security
Mechanically and visually imperceptible sensor sheets integrated with lightweight wireless loggers are employed in ultimate flexible hybrid electronics (FHE) to reduce vital stress/nervousness and monitor natural biosignal responses. The key technologies and applications for conceptual sensor system fabrication are reported, as exemplified by the use of a stretchable sensor sheet completely conforming to an individual's body surface to realize a low‐noise wireless monitoring system (<1 µV) that can be attached to the human forehead for recording electroencephalograms. The above system can discriminate between Alzheimer's disease and the healthy state, thus offering a rapid in‐home brain diagnosis possibility. Moreover, the introduction of metal nanowires to improve the transparency of the biocompatible sensor sheet allows one to wirelessly acquire electrocorticograms of nonhuman primates and simultaneously offers optogenetic stimulation such as toward‐the‐brain–machine interface under free movement. Also discussed are effective methods of improving electrical reliability, biocompatibility, miniaturization, etc., for metal nanowire based tracks and exploring the use of an organic amplifier as an important component to realize a flexible active probe with a high signal‐to‐noise ratio. Overall, ultimate FHE technologies are demonstrated to achieve efficient closed‐loop systems for healthcare management, medical diagnostics, and preclinical studies in neuroscience and neuroengineering.