期刊
NANO ENERGY
卷 74, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104932
关键词
Wearable sensor; 3D textile; Multi-local strain; Multi-modal sensing; Amplified piezoelectricity
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1A2B6005220]
- Technology Innovation Program - Ministry of Trade, Industry AMP
- Energy (MOTIE, Republic of Korea) [20003970]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20003970] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a new wearable multi-local strain sensor (MLS-sensor) based on 3D textile structure with pre-strained monofilament was proposed, which features two modes. First, the vibration mode detects bio-signals from voice printing, respiration and blood pulse. Second, the tensile and compression mode, which detects signals from body movement based on pressure of fingertip and gait, four movement of neck, and joint movement (elbow and knee). Previous research studies mainly focused on investigation on how to enhance the output performance of piezoelectric PVDF film via nanostructure. However, this study explores how macro-sized 3D textile structure can improve the piezoelectric performance of PVDF film. Whereas, 3D textile structure has been commonly utilized as a pressure absorber due to the space caused by the monofilament that exhibits viscoelastic behavior. The MLS-sensor utilizes the pre-strained monofilament of 3D textile structure as a pressure transmitter to create amplified strain resulting from multi-local strain (MLS) in PVDF film in order to improve the PVDF piezoelectric performance. The MLS-sensor was shown to amplify the piezoelectric output voltage (4.6 V) up to 5 times (25.6 V) using the same pressure.
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