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Twistable and Stretchable Sandwich Structured Fiber for Wearable Sensors and Supercapacitors

Title
Twistable and Stretchable Sandwich Structured Fiber for Wearable Sensors and Supercapacitors
Author
김선정
Keywords
Strain sensor; elastomeric supercapacitor; buckled nanotubes; sandwich fiber
Issue Date
2016-11
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v. 16, NO. 12, Page. 7677-7684
Abstract
Twistable and stretchable fiber-based electrochemical devices having high performance are needed for future applications, including emerging wearable electronics. Weavable fiber redox supercapacitors and strain sensors are here introduced, which comprise a dielectric layer sandwiched between functionalized buckled carbon nanotube electrodes. On the macroscopic scale, the sandwiched core rubber of the fiber acts as a dielectric layer for capacitive strain sensing and as an elastomeric substrate that prevents electrical shorting and irreversible structural changes during severe mechanical deformations. On the microscopic scale, the buckled CNT electrodes effectively absorb tensile or shear stresses, providing an essentially constant electrical conductance. Consequently, the sandwich fibers provide the dual functions of (1) strain sensing, by generating approximately 115.7% and 26% capacitance changes during stretching (200%) and giant twist (1700 rad.m(-1) or 270 turns.m(-1)), respectively, and (2) electrochemical energy storage, providing high linear and areal capacitances (2.38 mF.cm(-1) and 11.88 mF.cm(-2)) and retention of more than 95% of initial energy storage capability under large mechanical deformations.
URI
https://pubs.acs.org/doi/10.1021/acs.nanolett.6b03739http://repository.hanyang.ac.kr/handle/20.500.11754/100908
ISSN
1530-6984; 1530-6992
DOI
10.1021/acs.nanolett.6b03739
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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