35 research outputs found
Fabrication of lead free flexible electrospun hybrid nanofibers for designing mechanical energy harvester
No full textThe inclusion of electroactive β-phase in Sn2+ incorporated PVDF composite film for improving dielectric properties and piezoelectric energy generation
No full textThe past, present, and future of piezoelectric fluoropolymers: Towards efficient and robust wearable nanogenerators
No full textPolyvinylidene difluoride (PVDF) derivatives in metal/PVDF/metal (MPM) sandwich structures have been studied extensively since 1969. Cousin copolymers of the same family have been discovered with fascinating piezoelectric, pyroelectric, electrocaloric, and ferroelectric properties. Solution processing, flexibility, lightweight, and thermal stability make this class of materials complementary to inorganics. Thus, PVDF based polymers potentially compete with inorganic materials for a broad range of technologies such as energy generators, loudspeakers, coolers, and memories. However, the stable non-electroactive α-phase and hydrophobic nature of PVDF are the main barriers for developoing high performing and robust MPM devices in electronic applications. In this review, we present an up-to-date overview on different methods to induce the electroactive β-phase and improve the adhesion strength with metals to ensure robust and durable MPM devices. We go through advantages and disadvantages of several methods and pinpoint future opportunities in this research area. A special attention is paid to wearable piezoelectric nanogenerators for energy harvesting from human body motion, where flexible PVDF derivatives are compared with rigid piezoelectric ceramics. While the piezoelectric coefficient of PVDF (d33 ~ 24–34 pm/V) is one order lower than ceramic materials, novel co-polymers of PVDF display d33 > 1000 pm/V upon bias. This shows promise to bring piezoelectrics to flexible and large-area applications such as smart textiles. We also discussed challenges to improve wearability, such as light weight, breathability, and flexibility.Funding Agencies|Linköpings Universitet, LiU, (2009-00971); Knut och Alice Wallenbergs Stiftelse, (KAW 2022-0383)</p
Native Cellulose Microfiber-Based Hybrid Piezoelectric Generator for Mechanical Energy Harvesting Utility
No full textNative Cellulose Microfiber-Based Hybrid Piezoelectric Generator for Mechanical Energy Harvesting Utility
No full textA flexible hybrid piezoelectric generator
(HPG) based on native cellulose microfiber (NCMF) and polydimethylsiloxane
(PDMS) with multi wall carbon nanotubes (MWCNTs) as conducting filler
is presented where the further chemical treatment of the cellulose
and traditional electrical poling steps for piezoelectric voltage
generation is avoided. It delivers a high electrical throughput that
is an open circuit voltage of ∼30 V and power density ∼9.0
μW/cm<sup>3</sup> under repeated hand punching. We demonstrate
to power up various portable electronic units by HPG. Because cellulose
is a biocompatible material, suggesting that HPG may have greater
potential in biomedical applications such as implantable power source
in human body
Native Cellulose Microfiber-Based Hybrid Piezoelectric Generator for Mechanical Energy Harvesting Utility
No full textA flexible hybrid piezoelectric generator
(HPG) based on native cellulose microfiber (NCMF) and polydimethylsiloxane
(PDMS) with multi wall carbon nanotubes (MWCNTs) as conducting filler
is presented where the further chemical treatment of the cellulose
and traditional electrical poling steps for piezoelectric voltage
generation is avoided. It delivers a high electrical throughput that
is an open circuit voltage of ∼30 V and power density ∼9.0
μW/cm<sup>3</sup> under repeated hand punching. We demonstrate
to power up various portable electronic units by HPG. Because cellulose
is a biocompatible material, suggesting that HPG may have greater
potential in biomedical applications such as implantable power source
in human body
Biomechanical and Acoustic Energy Harvesting from TiO<sub>2</sub> Nanoparticle Modulated PVDF Nanofiber Made High Performance Nanogenerator
No full textBiomechanical and Acoustic Energy Harvesting from TiO<sub>2</sub> Nanoparticle Modulated PVDF Nanofiber Made High Performance Nanogenerator
No full textAn
integrated platform made with a piezoelectric nanogenerator (NG) is
designed to convert daily human activities and acoustic vibration
into useable electrical energy. The titanium dioxide (TiO2) nanoparticles (NPs) are playing a significant role as external
fillers in poly(vinylidene fluoride) (PVDF) electrospun nanofiber
that improves the overall performance of the NG. It effectively enhanced
the piezoelectric β-phase content (16% higher F (β)) and
mechanical (148% increment of tensile strength) properties of composite
PVDF nanofiber. The superior integration of NG has been demonstrated
to generate electricity from a human gait. The acoustic sensitivity
and energy conversion efficiency are found to be 26 V Pa–1 and 61%, respectively, which are superior in comparison to the reported
results. By scavenging the mechanical energy, NG is capable of charging
up a 1 μF capacitor; for example, ∼20 V is within 50
s that ensures its ability to power up commercial LED tape and a LCD
screen. Thus, in this work, a high performance piezoelectric NG is
presented that has potential application in the health care sector
and robotics area, in particular for use as a self-powered system
The enhanced ionic thermal potential by a polarized electrospun membrane
No full textInspired by thermally sensitive ion channels in human skin, a polarized membrane composed of a ferroelectric polymer fiber matrix is used to double the heat-induced potential in ionic thermoelectric devices. The comparison of the thermal potentials between different directions of polarization and temperature gradient indicates the importance of cation-dipole interactions for the enhancement. Adding a polarized membrane to ionic thermoelectric devices induces dipole-ion interaction and enhances the thermal voltage by more than double.Funding Agencies|EU commission [101058284]; Swedish Research Council [VR 2018-04037]; AForsk Foundation [23-220]; Advanced Functional Materials Centerat Linko ping University</p
Selective detection of environmentally hazardous Hg2+ ion by bio-functionalized reusable silver nanoparticles
No full text
