Microstructure and piezoelectric properties of PVDF films

Hausler, E.; Kaufmann, Walter; Petermann, J.; Stein, Lewin

doi:10.1080/00150198408017508

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…The β‐phase is the strongest polar phase due to the all‐trans conformation in which fluorine atoms and hydrogen atoms are on the opposite sides of the polymer backbone and results in a net dipole moment. This polar phase provides PVDF with piezoelectric and pyroelectric properties [5]. The nonpolar α‐phase predominates at melting crystallization below 160°C, whereas the oriented polar β‐phase is normally obtained by drawing of α‐phase films between 70°C and 100°C [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesize procedures, mechanical and electrical properties of poly(vinylidene fluoride) nanocomposite thin films containing multiwalled carbon nanotubes

2011

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A procedure is proposed to prepare poly(vinylidene fluoride) (PVDF) multiwalled carbon nanotubes (MWCNTs) nanocomposite thin films with improved mechanical and dielectric properties compared to the pure PVDF films. The PVDF/MWCNT mixture with a composition range from 0.0 to 5.0% MWCNTs by weight was formed using solution blending and the ultrasonic dispersion method and then spin coated on a rotating glass substrate to produce films nearly 20 l thick. Results indicate that the appropriate addition of MWCNTs (up to 3.0 wt%) to PVDF can significantly increase its elastic modulus while decrease its fracture toughness. The elastic modulus shows softening at a 5.0 wt% MWCNT loading. The DC and AC conductivity of the composite films were also examined with various MWCNTs concentrations. The dielectric constants were found more than doubled for 0.5 wt% MWCNTs composite compared to the values for the pure PVDF. POLYM. COM-POS., 33:509-514,

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Section: Introductionmentioning

confidence: 99%

Synthesize procedures, mechanical and electrical properties of poly(vinylidene fluoride) nanocomposite thin films containing multiwalled carbon nanotubes

2011

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“…It covers a wide range of magnitude and frequency from cell contraction to ocean waves. The mechanical-electric energy conversion has been demonstrated using piezoelectric cantilever working at its resonating mode. − However, the applicability and adaptability of the traditional cantilever based energy harvester is greatly impeded by the large unit size, large triggering force and specific high resonance frequency. Recently, a series of rationally designed nanogenerators (NGs) with piezoelectric nanowires (NWs) have shown great potential to scavenge tiny and irregular mechanical energy. − However, insufficient electric output hinders their practical applications.…”

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confidence: 99%

Flexible High-Output Nanogenerator Based on Lateral ZnO Nanowire Array

et al. 2010

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We report here a simple and effective approach, named scalable sweeping-printing-method, for fabricating flexible highoutput nanogenerator (HONG) that can effectively harvesting mechanical energy for driving a small commercial electronic component. The technique consists of two main steps. In the first step, the vertically aligned ZnO nanowires (NWs) are transferred to a receiving substrate to form horizontally aligned arrays. Then, parallel stripe type of electrodes are deposited to connect all of the NWs together. Using a single layer of HONG structure, an open-circuit voltage of up to 2.03 V and a peak output power density of ∼11 mW/cm 3 have been achieved. The generated electric energy was effectively stored by utilizing capacitors, and it was successfully used to light up a commercial light-emitting diode (LED), which is a landmark progress toward building self-powered devices by harvesting energy from the environment. This research opens up the path for practical applications of nanowire-based piezoelectric nanogeneragtors for self-powered nanosystems.KEYWORDS Nanogenerator, ZnO, nanowire, light-emitting diode, self-powering E nergy harvesting is critical to achieve independent and sustainable operations of nanodevices, aiming at building self-powered nanosystems. 1-3 Taking the forms of irregular air flow/vibration, ultrasonic waves, body movement, and hydraulic pressure, mechanical energy is ubiquitously available in our living environment. It covers a wide range of magnitude and frequency from cell contraction to ocean waves. The mechanical-electric energy conversion has been demonstrated using piezoelectric cantilever working at its resonating mode. [4][5][6][7] However, the applicability and adaptability of the traditional cantilever based energy harvester is greatly impeded by the large unit size, large triggering force and specific high resonance frequency. Recently, a series of rationally designed nanogenerators (NGs) with piezoelectric nanowires (NWs) have shown great potentialtoscavengetinyandirregularmechanicalenergy. [8][9][10][11][12][13][14][15] However, insufficient electric output hinders their practical applications. We report here a simple and effective approach, named scalable sweeping-printing-method, for fabricating flexible high-output nanogenerator (HONG). An open-circuit voltage of up to 2.03 V and a peak output power density of ∼11 mW/cm 3 have been achieved. The generated electric energy was effectively stored by utilizing capacitors, and it was successfully used to light up a commercial lightemitting diode (LED), which is a landmark progress toward building self-powered devices by harvesting energy from the environment. Furthermore, by optimizing the density of the NWs on the substrate and with the use of multilayer integration, a peak output power density of ∼0.44 mW/cm 2 and volume density of 1.1 W/cm 3 are predicted.The mechanism of converting mechanical energy by a single ZnO NW that is laterally bonded to a substrate has been discussed in details in our previous rep...

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“…Considering that body movements generate > 100 W of power 1 , several methods of mechanical energy harvesting have been studied, some more suited for low frequencies than others. Piezoelectric (PZ) based energy harvesters offer promise for flexible wearable electronics with embeds in shoes 3,4 , fibers 5,6 and bio implants 7,8 having been investigated.…”

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confidence: 99%