Journal
SMART MATERIALS AND STRUCTURES
Volume 23, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/23/2/025003
Keywords
electrospinning; near-field electrospinning; PVDF; energy harvester; nonwoven fiber fabric
Funding
- National Science Council of Taiwan [NSC-100-2628-E-110-006-MY3]
- National Science Council Core Facilities Laboratory for Nano-Science and Nano-Technology in National Sun Yat-sen University, Kaohsiung-Pingtung area, Taiwan
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One-dimensional piezoelectric nanomaterials have attracted great attention in recent years for their possible applications in mechanical energy scavenging devices. However, it is difficult to control the structural diameter, length, and density of these fibers fabricated by micro/nano-technologies. This work presents a hollow cylindrical near-field electrospinning (HCNFES) process to address production and performance issues encountered previously in either far-field electrospinning (FFES) or near-field electrospinning (NFES) processes. Oriented polyvinylidene fluoride (PVDF) fibers in the form of nonwoven fabric have been directly written on a glass tube for aligned piezoelectricity. Under a high in situ electrical poling field and strong mechanical stretching (the tangential speed on the glass tube collector is about 1989: 3 mm s(-1)), the HCNFES process is able to uniformly deposit large arrays of PVDF fibers with good concentrations of piezoelectric beta-phase. The nonwoven fiber fabric (NFF) is transferred onto a polyethylene terephthalate (PET) substrate and fixed at both ends using copper foil electrodes as a flexible textile-fiber-based PVDF energy harvester. Repeated stretching and releasing of PVDF NFF with a strain of 0.05% at 7 Hz produces a maximum peak voltage and current at 76 mV and 39 nA, respectively.
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