Journal
NANO ENERGY
Volume 69, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104415
Keywords
Triboelectric generator; Electromagnetic generator; Hybrid generator; Magnetic-field-induced spray self-assembly; Microneedle array
Categories
Funding
- National Natural Science Foundation of China [51575543, 51975597]
- General Program of Shenzhen Innovation Funding [JCYJ20170818164246179]
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Most triboelectric-electromagnetic hybrid generators (TEHGs) are not suitable for monitoring human motions as wearable self-powered sensors owing to the rigid, complicated and bulky structures. In this work, we developed a novel magnetized microneedle-array (MA) based flexible TEHG for monitoring human motions. The magnetic-field-induced spray self-assembly method with electro-magnetizing technique was firstly proposed to cost-effectively fabricate magnetized microneedles for TEHG. The magnetized microneedles in TEHG simultaneously serve as the frictional layer of triboelectric generator (TEG) and bendable magnetic poles of electromagnetic generator (EMG). TEG utilized the closed bending-friction-restoring behavior of microneedles to generate triboelectricity while EMG used the rotation of magnetized microneedles to produce the induced electromotive force. TEG could output the open-circuit voltage (V-OC) of 10 V and the EMG could generate the short-circuit current (I-SC) of 80 mu A under the 30 N and 1 Hz compressing-releasing operations. We demonstrated that the MA-based TEHG, integrated in insole and attached on elbow as the self-powered sensors, could exactly detect triggering frequency of human motions. Considering the unique advantages, including flexibility, small dimension, light weight, and easy scale up, further applications of TEHG in wearable electronics, self-powered sensors, and healthcare monitoring system are promising.
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