Design and fabrication of a piezoelectric out-put evaluation system for sensitivity measurements of fibrous sensors and actuators

Bafqi, Mohammad Sajad Sorayani; Sadeghi, Ali; Latifi, Masoud

doi:10.1177/1528083719867443

Cited by 26 publications

(7 citation statements)

References 34 publications

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“…This finding suggests that UiO-66 particles favor the transformation of the α phase of PVDF into β crystals. It has been suggested that the presence of optimum content of solid particles during electrospinning act as nuclei in the crystallization process of the β phase . Moreover, stretching of the polymer chains during electrospinning can promote the chain orientation and transformation of the nonpolar α-phase (trans–gauche chain conformation) into polar β-phase (all-trans conformation) .…”

Section: Resultsmentioning

confidence: 99%

Self-Powered Wearable Piezoelectric Sensors Based on Polymer Nanofiber–Metal–Organic Framework Nanoparticle Composites for Arterial Pulse Monitoring

Moghadam

Hasanzadeh

Simchi

2020

ACS Appl. Nano Mater.

103

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High-performance wearable electronic devices with the capability of converting mechanical force into electrical energy have been gaining increasing attention for biomedical monitoring applications. We present a novel wearable piezoelectric sensor based on a poly(vinylidene fluoride) (PVDF) nanofibrous membrane containing microporous zirconium-based metal–organic frameworks (MOFs) for arterial pulse monitoring. It is shown that the incorporation of 5 wt % of MOF greatly enhances the piezoelectric constant of the polymer fibrous mat by 3.4-fold without significant loss in its flexibility. The nanofibrous composite exhibits a peak-to-peak voltage of 600 mV under an applied force of 5 N, which is superior to many flexible pressure sensors. It is demonstrated that the enhanced piezoelectric performance of the nanofibrous composite is not only attributed to the increased degree of crystallinity and polar β phase content (75%) but also to the surface chemistry and topography of the nanofibers. Evaluations of the piezoelectric output of the sensor attached to the radial artery at normal body conditions reveal significantly better output voltage (568 ± 76 mV) and sensitivity (0.118 V/N) than nanofibrous PVDF devices for wrist pulse monitoring. The results of this work pave a new way to develop flexible piezoelectric nanofibrous sensors based on MOFs for environmentally sustainable energy generation and wearable healthcare monitoring systems.

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Section: Resultsmentioning

confidence: 99%

Self-Powered Wearable Piezoelectric Sensors Based on Polymer Nanofiber–Metal–Organic Framework Nanoparticle Composites for Arterial Pulse Monitoring

Moghadam

Hasanzadeh

Simchi

2020

ACS Appl. Nano Mater.

103

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“…The solution was stirred on a heater stirrer for 2 h at 60°C until a transparent viscous solution of PVDF was prepared. A horizontal electrospinning (FNM© electrospinning system, Iran) was employed to fabricate PVDF micro-nano fiber mats according to previous studies (applied voltage: 18 kV, distance: 17 cm, needle gage: 22, drum speed: 100 r/min, flow rate: 0.5 mL/h, 1 mL of solution), and nanofibers were collected on an aluminum foil [22]. The fabricated nanofiber mats were kept in a desiccator to vaporize their remaining solvents.…”

Section: Methodsmentioning

confidence: 99%

“…The electrical output of samples, as an important parameter to determine the performance of piezoelectric devices, was examined by the PiezoTester (Functional Fibrous Materials Lab, http://ffm.aut.ac.ir) [22] at a constant load (2.66 N) and compressive mode with different frequencies and cycles. Samples, which were prepared from a 3 × 3 cm nanofiber mats as an active layer, were placed between two aluminum foils as collectors (Figure 1) and fixed by a very thin tape.…”

Section: Methodsmentioning

confidence: 99%

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Expected lifetime of fibrous nanogenerator exposed to cyclic compressive pressure

Bafqi

Latifi

Sadeghi

et al. 2020

Journal of Industrial Textiles

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In this paper, in order to identify the lifetime of energy scavenging devices, the effect of a cyclic compressive load on the performance of polyvinylidene fluoride micro-nano fibrous nanogenerators was investigated, and the electrical output of layers was measured at different cycles and frequencies. Results showed that as the number of cycles increased at the constant frequency, the electrical output initially largely increased and then reached to a maximum level with a very gentle slope. Moreover, the crystalline structure and β-phase of the PVDF nanofibrous mats improved by applying a periodic compressive force. This study showed that, although the PVDF electrospun micro-nano fibers have suitable piezoelectric properties, it is necessary to make some post-treatment to fabricate an energy harvester with constant performance. Results also showed that when the number of cycles at a constant frequency increased, mechanical properties also improved. These results enable us to have an idea about the expected lifetime of a fibrous nanogenerator exposed to cyclic compressive pressure.

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“…An electrospun PVDF nanofibers' webs improved 94.49% electrical output conversion with the force of 2.6 N. The results also showed the PVDF nanofibers improved their generated outputs at different angles of forces hit to nanofibers. A further study on nanofibers was by Bafqi et al (2021) and showed the improvement of output performance. The improved output voltage when applied pressure with a new energy harvesting design with nanofibers piezo-polymers has shown great sensitivity of generated output in the results.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Polyvinylidene Difluoride-based Energy Harvesting with IDE Circuit Flexible Cantilever Beam

Ahmad¹,

Abdullah²,

Rahman³

et al. 2022

JST

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Piezoelectric energy harvesting is the process of extracting electrical energy using energy harvester devices. Any stress in the piezoelectric material will generate induced voltage. Previous energy harvester device with stiff cantilever beam was generated low harvested energy. A flexural piezoelectric energy harvester is proposed to improve the generated harvesting energy. Polyvinylidene difluoride is a polymer piezoelectric material attached to a flexible circuit made of polyimide. Four interdigitated electrode circuits were designed and outsourced for fabrication. The polyvinylidene difluoride was then attached to the interdigitated electrode circuit, and a single clear adhesive tape was used to bind them. Four piezoelectric energy harvesters and ultrasonic ceramic generators were experimentally tested using a sieve shaker. The sieve shaker contains a two-speed oscillator, with M1=0.025 m/s and M2=0.05 m/s. It was used to oscillate the energy harvester devices. The resulting induced voltages were then measured. Design 4, with the widest width of electrode fingers and the widest gap between electrode fingers, had the highest power generated at an output load of 0.745 µW with the M2 oscillation speed. The oscillation speed of the sieve shaker impacted the energy harvester devices as a higher oscillation speed gave higher generated power.

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Design and fabrication of a piezoelectric out-put evaluation system for sensitivity measurements of fibrous sensors and actuators

Cited by 26 publications

References 34 publications

Self-Powered Wearable Piezoelectric Sensors Based on Polymer Nanofiber–Metal–Organic Framework Nanoparticle Composites for Arterial Pulse Monitoring

Self-Powered Wearable Piezoelectric Sensors Based on Polymer Nanofiber–Metal–Organic Framework Nanoparticle Composites for Arterial Pulse Monitoring

Expected lifetime of fibrous nanogenerator exposed to cyclic compressive pressure

Characterization of Polyvinylidene Difluoride-based Energy Harvesting with IDE Circuit Flexible Cantilever Beam

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