Nano-Scale Characterization of a Piezoelectric Polymer (Polyvinylidene Difluoride, PVDF)

Lee, Hyungoo; Cooper, Rodrigo; Wang, Ke; Liang, Hong

doi:10.3390/s8117359

Cited by 23 publications

(10 citation statements)

References 23 publications

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“…Piezoelectric material-based NGs may play an important role because they can scavenge mechanical energy and transform it into a more flexible form, such as electrical energy. To date, piezoelectric materials based on PZT (lead zirconate titanate) [1][2][3], BaTiO 3 [4,5], polyvinylidene difluoride (PVDF) [6,7], BNT (bismuth sodium titanate) [8], and zinc oxide (ZnO) [9][10][11][12][13][14][15][16][17][18][19][20] have been the most widely investigated ones for use in transducers, actuators, transformers, photonics, optoelectronics, and sensors. However, fiber-based piezoelectric NGs [21][22][23] have not been extensively developed for keyboards because they must be resistant to large mechanical loads.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Zinc Oxide-Based Electrospun Nanofibers for Mechanical Energy Harvesting

Suyitno

Purwanto

Hidayat

et al. 2014

Journal of Nanotechnology in Engineering and Medicine

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Doped and undoped zinc oxide fibers were fabricated by electrospinning at various solution flow rates of 2, 4, and 6 ll/min followed by sintering at 550 C. The nanogenerators (NGs) fabricated from the fibers were examined for their performance by applying loads (0.25-1.5 kg) representing fingers taps on the keyboard. A higher solution flow rate resulted in a larger fiber diameter, thus reducing nanogenerator voltage. The maximum power density for undoped zinc oxide-based and doped zinc oxide-based nanogenerators was 17.6 and 51.7 nW/cm 2 , respectively, under a load of 1.25 kg. Enhancing nanogenerator stability is a topic that should be investigated further.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Zinc Oxide-Based Electrospun Nanofibers for Mechanical Energy Harvesting

Suyitno

Purwanto

Hidayat

et al. 2014

Journal of Nanotechnology in Engineering and Medicine

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“…A recent comparison of electrospun cellulose acetate fibers and commercial glass fiber media challenged with solid (NaCl) and liquid (diethyl hexyl sebacate oil) aerosols at high face velocities (45 cm/s) revealed that electrospun fiber media had higher filter indices [ 35 ]. Filter media with electrostatic charges on fiber surfaces can enhance particle capture and reduce the most particle penetrating particle size (MPPS) in the range of 150 nm, as compared to glass filter media of similar fiber sizes, but without electrostatic field enhancement [ 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols

Lolla

Abutaleb

et al. 2016

Materials

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Electrospun polyvinylidene fluoride (PVDF) fiber mats with average fiber diameters (≈200 nm, ≈2000 nm) were fabricated by controlled electrospinning conditions. These fiber mats were polarized using a custom-made device to enhance the formation of the electret β-phase ferroelectric property of the fibers by simultaneous uniaxial stretching of the fiber mat and heating the mat to the Curie temperature of the PVDF polymer in a strong electric field of 2.5 kV/cm. Scanning electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry and Brunauer-Emmett-Teller (BET) surface area analyses were performed to characterize both the internal and external morphologies of the fiber mat samples to study polarization-associated changes. MATLAB simulations revealed the changes in the paths of the electric fields and the magnetic flux inside the polarization field with inclusion of the ferroelectric fiber mats. Both polarized and unpolarized fiber mats were challenged as filters against NaCl particles with average particle diameters of about 150 nm using a TSI 8130 to study capture efficiencies and relative pressure drops. Twelve filter experiments were conducted on each sample at one month time intervals between experiments to evaluate the reduction of the polarization enhancement over time. The results showed negligible polarization loss for the 200-nm fiber sample. The polarized mats had the highest filter efficiencies and lowest pressure drops.

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“…Finally, Lee and co-workers [98] have studied the conductivity of polyvinylidene difluoride (PVDF) microstructures under predefined stress via C-AFM. In their work, the same region of the sample was scanned before and after the application of an electrical signal.…”

Section: Advanced Toolsmentioning

confidence: 99%

Atomic Force Microscopy: A Powerful Tool to Address Scaffold Design in Tissue Engineering

Marrese

Guarino

Ambrosio

2017

JFB

104

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Functional polymers currently represent a basic component of a large range of biological and biomedical applications including molecular release, tissue engineering, bio-sensing and medical imaging. Advancements in these fields are driven by the use of a wide set of biodegradable polymers with controlled physical and bio-interactive properties. In this context, microscopy techniques such as Atomic Force Microscopy (AFM) are emerging as fundamental tools to deeply investigate morphology and structural properties at micro and sub-micrometric scale, in order to evaluate the in time relationship between physicochemical properties of biomaterials and biological response. In particular, AFM is not only a mere tool for screening surface topography, but may offer a significant contribution to understand surface and interface properties, thus concurring to the optimization of biomaterials performance, processes, physical and chemical properties at the micro and nanoscale. This is possible by capitalizing the recent discoveries in nanotechnologies applied to soft matter such as atomic force spectroscopy to measure surface forces through force curves. By tip-sample local interactions, several information can be collected such as elasticity, viscoelasticity, surface charge densities and wettability. This paper overviews recent developments in AFM technology and imaging techniques by remarking differences in operational modes, the implementation of advanced tools and their current application in biomaterials science, in terms of characterization of polymeric devices in different forms (i.e., fibres, films or particles).

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Nano-Scale Characterization of a Piezoelectric Polymer (Polyvinylidene Difluoride, PVDF)

Cited by 23 publications

References 23 publications

Fabrication and Characterization of Zinc Oxide-Based Electrospun Nanofibers for Mechanical Energy Harvesting

Fabrication and Characterization of Zinc Oxide-Based Electrospun Nanofibers for Mechanical Energy Harvesting

Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols

Atomic Force Microscopy: A Powerful Tool to Address Scaffold Design in Tissue Engineering

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