A high output voltage flexible piezoelectric nanogenerator using porous lead-free KNbO3 nanofibers

Ganeshkumar, Rajasekaran; Cheah, Chin Wei; Xu, Renjie; Kim, Sung Hoon; Zhao, Ruike Renee

doi:10.1063/1.4992786

Cited by 36 publications

(16 citation statements)

References 34 publications

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“…The KNbO 3 nanoparticles (KN NPs) with perovskite structure were aligned in the PDMS by a simple method of dielectrophoresis. As a filler, KNbO 3 (KN) or NaNbO 3 (NN) was chosen due to its lead‐free nature and good piezoelectric properties, which has been used in fabricating many flexible piezoelectric device . The optimized composite generates a large short circuit current ( I SC ) up to 0.82 µA, which was nearly 4.5 times as high as that of the randomly dispersed composite.…”

Section: Introductionmentioning

confidence: 99%

High Performance Flexible Piezocomposites Based on a Particle Alignment Strategy

et al. 2020

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Piezocomposites composed of piezoelectric inorganic particles dispersed in a flexible polymer have emerged as promising materials for flexible energy harvesters and sensors. In this work, to overcome the inefficient stress transfer capability in flexible piezocomposites for energy harvester, KNbO3 (KN) particles prepared by conventional solid oxide process were aligned to form chain‐distributed particles in polydimethylsiloxane (PDMS) matrix by dielectrophoresis. The composite with 8 vol.‐% KN has peak open circuit voltage of 6.3 V and short‐circuit current of 0.82 µA under an applied force of 7 N, which are significantly improved in compared with the sample with piezoelectric particles randomly dispersed. Hugely enhanced stress‐transfer capability of the aligned composite plays a key role in achieving large piezoelectric response. This work provides a promising material candidate for high performance flexible energy harvester.

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Section: Introductionmentioning

confidence: 99%

High Performance Flexible Piezocomposites Based on a Particle Alignment Strategy

et al. 2020

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“…They exhibit a wide spectrum of outstanding properties, among others, ferroelectric photovoltaicity, pyroelectricity, high non-linear optical activity, ferroelasticity, and direct and inverse piezoelectricity. Due to this unique combination of different properties, ferroelectric nanomaterials are attractive for application in sensors of mechanothermal signals [2], pyroelectric harvesters for waste heat recovery [3], piezoelectric nanogenerators [4,5], non-volatile memories [6], gas sensors [7,8], photodetectors [2,9], and solar cells [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

A Ferroelectric-Photovoltaic Effect in SbSI Nanowires

2019

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A ferroelectric-photovoltaic effect in nanowires of antimony sulfoiodide (SbSI) is presented for the first time. Sonochemically prepared SbSI nanowires have been characterized using high-resolution transmission electron microscopy (HRTEM) and optical diffuse reflection spectroscopy (DRS). The temperature dependences of electrical properties of the fabricated SbSI nanowires have been investigated too. The indirect forbidden energy gap EgIf = 1.862 (1) eV and Curie temperature TC = 291 (2) K of SbSI nanowires have been determined. Aligned SbSI nanowires have been deposited in an electric field between Pt electrodes on alumina substrate. The photoelectrical response of such a prepared ferroelectric-photovoltaic (FE-PV) device can be switched using a poling electric field and depends on light intensity. The photovoltage, generated under λ = 488 nm illumination of Popt = 127 mW/cm2 optical power density, has reached UOC = 0.119 (2) V. The presented SbSI FE-PV device is promising for solar energy harvesting as well as for application in non-volatile memories based on the photovoltaic effect.

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“…A flexible PEH fabricated using a nanocomposite comprising porous potassium niobate (KNbO 3 ) nanofibers and PDMS generated an output power of 108.48 nW. [137] Incorporating 1 wt% boron nitride nanosheets (BNNSs) into the electrospun PVDF nanofiber membrane boosted the maximum strain by 175% compared to pure PVDF. [138] To understand the effect of filler morphology on the piezoelectric behavior, ZnO NPs and nanorods (NRs) were compared as nanofillers in PVDF fibers.…”

Section: Fiber-based Pehmentioning

confidence: 99%

Energy Harvesting and Storage with Soft and Stretchable Materials

et al. 2021

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Soft robotics can interact with humans safely. 3) Devices built from stretchable materials have a greater mechanical degree of freedom. This allows electronics, displays, and sensors to be integrated into places that would be difficult or impossible with rigid devices and enables new types of human-computer interfaces. It also allows robotics to have enhanced levels of dexterity and complexity in movement (consider the octopus as an inspiring example). 4) Devices that can be deformed elastically can be engineered to have new or emerging properties, such as antennas that change frequency with elongation, [21] intelligent materials that can perform unconventional forms of logic, [22,23] or composites that change thermal conductivity, [24] electrical conductivity, [25] or dielectric properties with deformation. [26][27][28] Most robotic and electronic devices require electricity to function, as shown on the left side of Figure 1A. Electricity can power sensors, enable computation, drive locomotion, and transmit information. Although most devices use electricity from an outlet, such "tethered" devices create notable limitations. In addition to limiting the degree of freedom of robotic materials, plug-in devices must be within a chords-length of a functioning outlet, thereby confining the range of use of such devices. Although battery operated devices can operate for some time without being plugged-in, the need to do so periodically is at best a nuisance that limits the operating time of a device. At worst, it can lead to issues such as lack of compliance with wearable devices (that is, the device is taken off for charging and never put back on) or disruptions in operation (a particular problem for health care devices or remotely deployed devices). Thus, there is a compelling interest in harvesting energy from the ambient to create tetherless devices or even devices that need less charging. Figure 1A (right side) provides examples of applications that may benefit from harvesting, such as internetof-things (IOT) devices, soft robots, wearables, implantables, and deployables (that is, devices sent to remote locations that do not have electrical outlets). Energy Harvesting CategoriesStrategies to harness energy typically convert waste or otherwise unused energy from the ambient into electricity. Although This review highlights various modes of converting ambient sources of energy into electricity using soft and stretchable materials. These mechanical properties are useful for emerging classes of stretchable electronics, e-skins, bio-integrated wearables, and soft robotics. The ability to harness energy from the environment allows these types of devices to be tetherless, thereby leading to a greater range of motion (in the case of robotics), better compliance (in the case of wearables and e-skins), and increased application space (in the case of electronics). A variety of energy sources are available including mechanical (vibrations, human motion, wind/fluid motion), electromagnetic (radio frequency (RF), solar), and ther...

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A high output voltage flexible piezoelectric nanogenerator using porous lead-free KNbO3 nanofibers

Cited by 36 publications

References 34 publications

High Performance Flexible Piezocomposites Based on a Particle Alignment Strategy

High Performance Flexible Piezocomposites Based on a Particle Alignment Strategy

A Ferroelectric-Photovoltaic Effect in SbSI Nanowires

Energy Harvesting and Storage with Soft and Stretchable Materials

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