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conferenceseries
.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Piezo-energy harvester of aligned electrospun PVDF nanofibers
Wen-Yuan Zeng, Chang-Mou Wu and Min-Hui Chou
National Taiwan University of Science and Technology, Taiwan
P
olyvinylidene Fluoride (PVDF) is a popular piezoelectric polymer because of its high flexibility, biocompatibility and
simplicity of production. These features make PVDF attractive in energy conversion applications between mechanical force
and electrical power, such as strain sensors, mechanical actuators and energy harvesters. The aforementioned applications rely
on the piezoelectric property of PVDF and it is well-known that appropriate mechanical stretching and electrical polarization
are essential factors to achieve good piezoelectricity. Electro-spinning processes can provide PVDF fibers mechanical stretching
and electrical poling simultaneously and produce ultrafine and well-distributed nanofibers. Furthermore, previous studies
discovered that the nanoparticles addition such as carbon nanomaterials or metallic nanoparticles could help improving the
β content of the electrospun PVDF nanofibers. In this study, a rotation drum was used to collect aligned PVDF nanofibers
during the electro-spinning process. The aligned fiber membranes were collected by changing the electro-spinning parameters
of the rotating speed and the applied voltage. The PVDF nanofiber membranes collected by rotating drum showed higher β
content and better mechanical property than the membranes collected on a fixed copper grid collector. The results showed
that the orientation and contents of β phase of the aligned nanofiber membranes were both increased with the rotating speed
and the applied voltage during the electro-spinning process. The β content of the PVDF fiber membrane reached to 87% at
rotating speed of 3000 rpm and applied electric field of 1500 V/cm. Moreover, the aligned PVDF nanofibers with Carbon
Nanotubes (CNTs) addition exhibited enhanced β phase content. The received PVDF nanofiber membranes were loaded and
evaluated by three types of dynamic mechanical forces: Compression, tensile and bending. According to the different types of
the mechanical loading, corresponding piezoelectric units were circumspectly designed. The piezoelectric response (electrical
output voltage) of the PVDF nanofiber membranes increased linearly with the applied forces and showed good stability during
the cyclic loading.
Biography
Wen-Yuan Zeng is currently pursuing her Master’s degree in Materials Science and Engineering from National Taiwan University of Science and Technology. She
has completed her graduate studies in Materials Science and Engineering from National Taiwan University of Science and Technology.
pinkgirls0111@gmail.comWen-Yuan Zeng et al., J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-008