High performance flexible micro-supercapacitor for powering a vertically integrated skin-attachable strain sensor on a bio-inspired adhesive
- Authors
- Park, H.; Song, C.; Jin, S.W.; Lee, H.; Keum, K.; Lee, Y.H.; Lee, G.; Jeong, Y.R.; Ha, J.S.
- Issue Date
- 5월-2021
- Publisher
- Elsevier Ltd
- Keywords
- All-in-one system; Bio-signal monitoring; Flexible micro-supercapacitor; Micropillar adhesive; Mixed oxide electrode; Non-aqueous electrolyte
- Citation
- Nano Energy, v.83
- Indexed
- SCIE
SCOPUS
- Journal Title
- Nano Energy
- Volume
- 83
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128929
- DOI
- 10.1016/j.nanoen.2021.105837
- ISSN
- 2211-2855
- Abstract
- We report on the fabrication of a high performance flexible micro-supercapacitor (MSC) for powering a vertically integrated skin-attachable strain sensor on a gecko-inspired micro-structured adhesive. Combined utilization of the mixed manganese/vanadium (Mn/V) oxide grown on MWCNT electrode and the sulfone-based electrolyte, PC/SL/LiClO4/PMMA, enhances both the capacitance and operation voltage up to 2 V of MSC. Thus, the fabricated MSC exhibits excellent electrochemical performance with an areal capacitance of 11.8 mF cm−2 and an areal energy density of 6.58 µWh cm−2 at an areal power density of 200 µW cm−2. The MSC shows mechanical stability over 1000 repetitive bends at a bending radius of 3.7 mm. The strain sensor made of fragmentized graphene foam embedded in PDMS film provides a high gauge factor of 12.6 up to 50% strain to detect strains due to various bio-signals. Our gecko-inspired adhesive made of PDMS micropillars inked with a mixture of PDMS and Silbione to have spatula tips exhibits not only high adhesion property but also high durability over repeated cycles of attachment-detachment and negligible skin irritation. After vertical integration of the MSC, strain sensor, and the adhesive film, bio-signals such as an arterial pulse, swallowing, and frowning of the brow are successfully detected using energy stored in the MSC. © 2021 Elsevier Ltd
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