TY - JOUR
T1 - Totally shape-conformable electrode/hydrogel composite for on-skin electrophysiological measurements
AU - Nagamine, Kuniaki
AU - Chihara, Shun
AU - Kai, Hiroyuki
AU - Kaji, Hirokazu
AU - Nishizawa, Matsuhiko
N1 - Funding Information:
This work was partly supported by Center of Innovation Program (COI), Creation of Innovation Centers for Advanced Interdisciplinary Research Area Program from Japan Science and Technology Agency, JST , Regional Innovation Strategy Support Program “Knowledge-based Medical Device Cluster/Miyagi Area”, Translational Research Network Program seeds A from Japan Agency for Medical Research and Development , and by Grant-in-Aid for Scientific Research A ( 25246016 ) and Challenging Exploratory Research ( K15K13315 ) from the Ministry of Education, Culture, Sports, Science and Technology, Japan .
Publisher Copyright:
© 2016
PY - 2016/12/1
Y1 - 2016/12/1
N2 - An Au film electrode supported by a conductive elastic film was tightly bonded on a stretchable double-network hydrogel sheet by means of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) grown from the electrode surface into the hydrogel. This electrode/hydrogel composite showed stable resistance of 35 ± 5 Ω sq−1 even during successive 20% stretching because of the pre-formed, designed cracks in the Au film. The large interfacial electric double layer capacitance (9.5 ± 0.3 mF cm−2) of the PEDOT adhesive layer at the interface of the layered composite was found to stabilize the electrode potential against external noises, and decrease the electric impedance at the frequency of 5–500 Hz, which is the typical range of electromyographic signals. The electrical robustness and shape-conformability of the composite electrode were demonstrated by monitoring electromyographic signals of the joint of a human forefinger. In addition, it was also demonstrated that an ionic liquid-containing gel (ionogel) serves as a substrate of the composite for longer-term monitoring over 3 days on air-exposed human skin.
AB - An Au film electrode supported by a conductive elastic film was tightly bonded on a stretchable double-network hydrogel sheet by means of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) grown from the electrode surface into the hydrogel. This electrode/hydrogel composite showed stable resistance of 35 ± 5 Ω sq−1 even during successive 20% stretching because of the pre-formed, designed cracks in the Au film. The large interfacial electric double layer capacitance (9.5 ± 0.3 mF cm−2) of the PEDOT adhesive layer at the interface of the layered composite was found to stabilize the electrode potential against external noises, and decrease the electric impedance at the frequency of 5–500 Hz, which is the typical range of electromyographic signals. The electrical robustness and shape-conformability of the composite electrode were demonstrated by monitoring electromyographic signals of the joint of a human forefinger. In addition, it was also demonstrated that an ionic liquid-containing gel (ionogel) serves as a substrate of the composite for longer-term monitoring over 3 days on air-exposed human skin.
KW - Conducting polymer
KW - Electrode/hydrogel hybrid
KW - Electrophysiological measurements
KW - Shape-conformable device
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U2 - 10.1016/j.snb.2016.06.076
DO - 10.1016/j.snb.2016.06.076
M3 - Article
AN - SCOPUS:84975840884
VL - 237
SP - 49
EP - 53
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
ER -