Title :
Piezoelectrets and their applications as wearable physiological-signal sensors and energy harvesters
Author :
Peng Fang;Qifang Zhuo;Yanhu Cai;Lan Tian;Haoshi Zhang;Yue Zheng;Guanglin Li;Liming Wu;Xiaoqing Zhang
Author_Institution :
Key Lab of Human-Machine Intelligence-Synergy Systems, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China
fDate :
6/1/2015 12:00:00 AM
Abstract :
Piezoelectrets are polymer-foam based space-charge electrets with strong piezoelectric effect. The piezoelectricity in piezoelectrets occurs due to the elastic heterogeneous cellular structure and the regularly arranged dipolar space charges stored therein. Some polymers have been experimented for piezoelectret preparation, where polypropylene (PP) is the mostly applied material at present. PP piezoelectrets have several promising features, such as large piezoelectric d33 coefficient, small thickness, light weight, low cost, large area scale, as well as flexibility and even stretchability, which would enable them very suitable for applications in signal sensing and energy harvesting. In this work, the electromechanical properties of flexible and stretchable PP piezoelectrets are introduced and some of their possible applications as wearable physiological-signal sensors and micro-energy harvesters are demonstrated by experiments.
Keywords :
"Sensors","Foot","Energy harvesting","Films","Biomedical monitoring","Monitoring","Piezoelectricity"
Conference_Titel :
Wearable and Implantable Body Sensor Networks (BSN), 2015 IEEE 12th International Conference on
DOI :
10.1109/BSN.2015.7299373