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작성일 : 17-02-23 13:16
Worm structure piezoelectric energy harvester_Energy
 글쓴이 : supervisor
조회 : 103  
   2017_alluri_Energy.pdf (2.9M) [1] DATE : 2017-02-23 13:16:45
Worm structure piezoelectric energy harvester using ionotropic gelation of barium titanate-calcium alginate composite
Nagamalleswara Rao Alluri a, 1, Sophia Selvarajan b, 1, Arunkumar Chandrasekhar c,
Balasubramaniam Saravanakumar c, Gae Myoung Lee d, Ji Hyun Jeong a, Sang-Jae Kim c, *

A laterally aligned flexible composite linear worm-based piezoelectric energy harvester made up of
piezoelectric barium titanate nanoparticles and a three dimensional gel network of calcium alginate
biopolymer was aimed to harness the low frequency mechanical energy. It is highly desirable to fabricate
innovative micro/nanostructures for high performance energy harvesting beyond the conventional thin
films, and small scale fabrication of nanowires (or rods). The open circuit voltage of a single composite
worm-based energy harvester (diameter z 550 mm, length z 2.5 cm) increases up to 5 times by
increasing the frequency of mechanical load (11 N) from 3 to 20 Hz. Similarly, 1.5 times voltage increment
was observed by increasing the length of the composite worm from 1.5 to 3.5 cm upon the biomechanical
hand force. The energy harvester can function as an efficient portable/wearable selfpowered
device due to its good flexibility, and multiple lengths of composite linear worms can be utilized
to drive low-power electronic devices. In this work, the composite worms were prepared by an
ionotropic gelation approach, which is eco-friendly, non-toxic, having low processing temperature/time,
and potential for cost-effective, large-scale fabrication, making it suitable for low frequency based selfpowered
devices.