α- &amp; β-crystalline phases in polyvinylidene fluoride as tribo-piezo active layer for nanoenergy harvester

Rajeev, Sreenidhi Prabha; Sabarinath, S.; Subash, CK; Valiyaneerilakkal, Uvais; Parameswaran, Pattiyil; Varghese, Soney

doi:10.1177/0954008318796141

Cited by 6 publications

(6 citation statements)

References 42 publications

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“…Materials in Hybrid Nanogenerators. Hybrid NGs were composed of at least two kinds of NGs to obtain better performance [110][111][112][113]. The summarization of wearable and implantable Hybrid NGs is shown in Table 3.…”

Section: Polymer-polymermentioning

confidence: 99%

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Nanogenerator-Based Self-Powered Sensors for Wearable and Implantable Electronics

et al. 2020

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Wearable and implantable electronics (WIEs) are more and more important and attractive to the public, and they have had positive influences on all aspects of our lives. As a bridge between wearable electronics and their surrounding environment and users, sensors are core components of WIEs and determine the implementation of their many functions. Although the existing sensor technology has evolved to a very advanced level with the rapid progress of advanced materials and nanotechnology, most of them still need external power supply, like batteries, which could cause problems that are difficult to track, recycle, and miniaturize, as well as possible environmental pollution and health hazards. In the past decades, based upon piezoelectric, pyroelectric, and triboelectric effect, various kinds of nanogenerators (NGs) were proposed which are capable of responding to a variety of mechanical movements, such as breeze, body drive, muscle stretch, sound/ultrasound, noise, mechanical vibration, and blood flow, and they had been widely used as self-powered sensors and micro-nanoenergy and blue energy harvesters. This review focuses on the applications of self-powered generators as implantable and wearable sensors in health monitoring, biosensor, human-computer interaction, and other fields. The existing problems and future prospects are also discussed.

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Section: Polymer-polymermentioning

confidence: 99%

“…The island-structured electromagnetic shielding hybrid nanogenerator (ES-HNG) was composed of a singleelectrode mode TENG and several PENGs [117]. A layer of Power source [110][111][112][113] Sensor [113,116] TENG-PENG-EMG Power source [118,119] PENG-PYENG-TENG Ag-coated fabric fiber [117] 12 × 3…”

Section: Polymer-polymermentioning

confidence: 99%

Nanogenerator-Based Self-Powered Sensors for Wearable and Implantable Electronics

et al. 2020

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“…α, β, γ, δ, and ε are the five different phases of PVDF in which all trans β is the most electroactive phase due to the parallel stacking of (−CH 2 −/−CF 2 −) dipoles. 14 Enhancement of the electroactive β phase is the major goal in this field of research. To enhance the content of the β phase of PVDF, different methods like mechanical stretching, heat treatments, polling, and making composites with nanofillers are employed.…”

Section: Introductionmentioning

confidence: 99%

Polymer Nanocomposites with UiO-Derived Zirconia Fillers for Energy Generation and Pressure-Sensing Devices: The Role of Crystal Structure and Surface Characteristics

Mukherjee,

Verma,

Madhu

et al. 2024

ACS Appl. Nano Mater.

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Piezoelectric energy harvesting and pressure sensing using polymer nanocomposites have opened up promising avenues in the field of flexible electronics. Herein, the influence of varying crystal structures of zirconia nanoparticles on a piezoelectric energy-generating zirconia-poly(vinylidene difluoride) (PVDF) composite is investigated, and the fabrication of a security alert pavement unit using the material with an optimized composition is demonstrated. More specifically, two metal−organic frameworks, UiO-66 and UiO-67, were employed to synthesize four different types of zirconia nanoparticles with precise control of the monoclinic and tetragonal phases. Polymer nanocomposite with monoclinic zirconia nanoparticles derived from UiO-66 (ZrO 2 -66m) performed better than other derivatives with 61% enhancement in the β phase with respect to pure PVDF. It was hypothesized that the stable crystalline structure of the monoclinic phase might act as a better nucleating agent, and among monoclinic derivatives, ZrO 2 -66m was found to be more hydrophobic, probably enabling a better interaction with PVDF. Subsequently, a prototype device with a PVDF-ZrO 2 -66m (P/66m) film was made and tested for its energy generation. The maximum output voltage generated by the device under an irregular biomechanical hand tapping force of 8−9 N was 80 V, while the maximum open circuit current was found to be 65 μA. The prototype displayed a power of 2162.24 μW at a load resistance of 1 MΩ. A laboratory scale demonstration was executed with the prototype as an energy-generating and security alert pavement unit. A wireless, Bluetooth-based security alert system supported by an Android application was developed and demonstrated as a promising application with the fabricated prototype. The results and demonstrations validate that the PVDF-monoclinic ZrO 2 nanoparticle nanocomposites will be an excellent value addition for flexible, durable energy generation and pressure-sensing applications.

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“…Poly(vinylidene fluoride) (PVDF) possesses outstanding electric properties, so it has broad application prospects in many fields, such as those of brakes, sensors, microcapacitors, − etc. The dielectric constant of PVDF, directly related to its crystal phase, is almost the highest in all polymers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of High-Performance Polyvinylidene Fluoride Films by the Combination of Simultaneous Biaxial Stretching and Solid-State Shear Milling Technologies

Zhang

Liu

et al. 2020

Ind. Eng. Chem. Res.

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Different from the traditional uniaxial stretching films, biaxially stretched films have excellent properties and broad application prospects. In this paper, by adopting simultaneous biaxial stretching (BO) and solid-state shear milling (S3M) technologies, polyvinylidene fluoride (PVDF) films with more β phases and homogeneous structures as well as better comprehensive properties were prepared. The powerful squeezing and three-dimensional shearing forces of S3M equipment promoted the rearrangement of PVDF macromolecular chains, so this endowed PVDF milled powders with the β phase of 91.1%. On this basis, the melt-extruded precursor sheets with a relatively high β-phase content were obtained, and even some phase reconversion still occurred during the melt extrusion. When suffering subsequent simultaneous biaxial tensile stress, the arrangement of PVDF molecular chains and the conversion of α-phase PVDF to the β phase were further promoted, leading to the increased β-phase content and crystallinity of the stretch films as well as a high dielectric constant, e.g., for the film with a 3.5 × 3.5 draw ratio, the β phase, crystallinity, and dielectric constant at the frequency of 1000 Hz were 53.9%, 64.3%, and 7.4, approximately 7.8%, 9.1%, and 1.6 times higher, respectively, than those of the film only directly obtained via BO technology.

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α- & β-crystalline phases in polyvinylidene fluoride as tribo-piezo active layer for nanoenergy harvester

Cited by 6 publications

References 42 publications

Nanogenerator-Based Self-Powered Sensors for Wearable and Implantable Electronics

Nanogenerator-Based Self-Powered Sensors for Wearable and Implantable Electronics

Polymer Nanocomposites with UiO-Derived Zirconia Fillers for Energy Generation and Pressure-Sensing Devices: The Role of Crystal Structure and Surface Characteristics

Preparation of High-Performance Polyvinylidene Fluoride Films by the Combination of Simultaneous Biaxial Stretching and Solid-State Shear Milling Technologies

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