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A highly sensitive and stress-direction-recognizing asterisk-shaped carbon nanotube strain sensor

Title
A highly sensitive and stress-direction-recognizing asterisk-shaped carbon nanotube strain sensor
Author
이화성
Keywords
CONDUCTIVITY; SKIN; TRANSPARENT; COMPOSITES; FILMS
Issue Date
2019-06
Publisher
Royal Society of Chemistry
Citation
JOURNAL OF MATERIALS CHEMISTRY C, v. 7, No. 31, Page. 9504-9512
Abstract
Flexible strain sensors are recognized as a key component of electronic-skin technology. One of the important features for strain sensors is that they should be able to sensitively recognize the direction of the external stress to accurately detect the various motions of humans or matter. Herein, we successfully developed a directionally responsive piezoresistive strain sensor with asterisk-shaped CNT sensing electrodes to recognize the direction of an applied external stress, thereby overcoming some of the shortcomings of established sensors. Under 5% strain, the change in relative resistance of the sensor developed here differed by up to a factor of 24.5 for different orientations of the sensor electrode relative to the source of the stress, i.e., a high angular dependence of the sensing performance on the external stress direction was observed. In particular, the asterisk-shaped CNT strain sensors showed a super-linear relationship between response and strain for low strains of up to 5%, allowing them to provide a good sensing platform for recognizing micro-deformations. Finally, we demonstrated that our sensor could recognize the direction of the movement of an applied brush and the magnitude and direction of the tilt of a home-built joystick attached onto the sensor device.
URI
https://pubs.rsc.org/en/content/articlehtml/2019/tc/c9tc02486ghttps://repository.hanyang.ac.kr/handle/20.500.11754/125318
ISSN
2050-7526; 2050-7534
DOI
10.1039/C9TC02486G
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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