Flexible Piezoelectric Touch Sensor by Alignment of Lead‐Free Alkaline Niobate Microcubes in PDMS

Deutz, Daniella Bayle; Mascarenhas, Neola T.; Schelen, J. B. J.; Leeuw, Dago M. de; Zwaag, Sybrand van der; Groen, W.A.

doi:10.1002/adfm.201700728

Cited by 112 publications

(76 citation statements)

References 32 publications

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“…[64] Copyright 2015, Elsevier. example, under an excitation of 5 N, the voltage remains steady at 16 V. [67] The results demonstrate an open-circuit voltage output larger than those of PVDF and ceramic PZT. A flexible electronic-skin sensor capable of detecting human physiological signals such as wrist pulse, muscle movements, speaking for voice recognition, and disease diagnosis was presented.…”

Section: Piezoelectric Polymer-based Energy Harvestersmentioning

confidence: 76%

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Recent Progress on Piezoelectric, Pyroelectric, and Magnetoelectric Polymer‐Based Energy‐Harvesting Devices

et al. 2019

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Energy harvesting from the environment based on electroactive polymers has been increasing in recent years. Ferroelectric polymers are used as mechanical‐to‐electrical energy transducers in a wide range of applications, scavenging the surrounding energy to power low‐power devices. These energy‐harvesting systems operate by taking advantage of the piezoelectric, pyroelectric, and magnetoelectric properties of the polymers, harvesting wasted environmental energy and converting it mainly into electrical energy. There have been developed different nano‐ and micro‐scale power harvesters with an increasing interest for powering mobile electronics and low‐power devices, including applications in remote access areas. Novel electronic devices are developed based on low‐power solutions, and therefore, polymer‐based materials represent a suitable solution to power these devices. Among the different polymers, the most widely used in the device application is the poly(vinylidene fluoride) (PVDF) family, due to its higher output performance.

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Section: Piezoelectric Polymer-based Energy Harvestersmentioning

confidence: 76%

“…Films with 1.1 mm of thickness were used with an excitation force variation from 1, 3, and 10 N peak to peak. As an example, under an excitation of 5 N, the voltage remains steady at 16 V . The results demonstrate an open‐circuit voltage output larger than those of PVDF and ceramic PZT.…”

Section: Representative Energy‐harvesting Applicationsmentioning

confidence: 88%

Recent Progress on Piezoelectric, Pyroelectric, and Magnetoelectric Polymer‐Based Energy‐Harvesting Devices

et al. 2019

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“…A typical piezoelectric sensor has three types of sensing modes, that is, longitudinal (d 33 ), transverse (d 31 ), and shear (d 15 ), depending on the way a piezoelectric material is cut or polarized. It is relatively easy to produce either longitudinal or transverse sensors based flexible piezoelectric [59,60] since the same electrode can be used for poling and sensing operations. However, the design and manufacture of shear force sensors continues to be a challenge as it requires a more complex configuration or device structure since the electrodes are applied normal to the direction of polarization.…”

Section: Self-powered Piezoelectric Sensorsmentioning

confidence: 99%

Flexible Multifunctional Sensors for Wearable and Robotic Applications

Xie

Hisano

Zhu

et al. 2019

Adv Materials Technologies

246

172

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This review provides an overview of the current state‐of‐the‐art of the emerging field of flexible multifunctional sensors for wearable and robotic applications. In these application sectors, there is a demand for high sensitivity, accuracy, reproducibility, mechanical flexibility, and low cost. The ability to empower robots and future electronic skin (e‐skin) with high resolution, high sensitivity, and rapid response sensing capabilities is of interest to a broad range of applications including wearable healthcare devices, biomedical prosthesis, and human–machine interacting robots such as service robots for the elderly and electronic skin to provide a range of diagnostic and monitoring capabilities. A range of sensory mechanisms is examined including piezoelectric, pyroelectric, piezoresistive, and there is particular emphasis on hybrid sensors that provide multifunctional sensing capability. As an alternative to the physical sensors described above, optical sensors have the potential to be used as a robot or e‐skin; this includes sensory color changes using photonic crystals, liquid crystals, and mechanochromic effects. Potential future areas of research are discussed and the challenge for these exciting materials is to enhance their integration into wearables and robotic applications.

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“…For sensor applications, on the other hand, the figure of merit is d 33 /ε, where ε is the absolute dielectric constant, or permittivity. Here, composites have shown to have the upper hand due to their low value of ε [11][12][13]. For energy harvesting, with the figure of merit being d 33 2 /ε, recent studies have shown that composites and ceramics can perform equally well [14,15].…”

Section: Introductionmentioning

confidence: 99%

The effect of the intrinsic electrical matrix conductivity on the piezoelectric charge constant of piezoelectric composites

Stuber

Mahon

Zwaag

et al. 2019

Mater. Res. Express

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Polymer-piezoceramic composites have drawn a lot of attention for sensor and energy harvesting applications. Poling such materials can be difficult due to the electric field getting mostly distributed over the low dielectric constant matrix. During this process, the electrical matrix conductivity plays a vital role. This work shows how two different polymer materials, loaded with various piezoelectric ceramic fillers, have very different poling efficiencies simply due to their intrinsic matrix conductivity. It is shown how temperature increases the matrix conductivity, and hence, increases the piezoelectric charge constant of the composites. By choosing the proper matrix material under the proper conditions, piezoelectric composites can be poled at electric fields as low as 2 kV mm −1 , which is identical to that of bulk ceramic fillers. In addition, the matrix conductivity can be altered by aging the composites in a high humidity atmosphere, which can increase the piezoelectric charge constant in similar fashion. This is a simple method to increase the matrix conductivity, and hence the piezoelectric charge constant, without the need to add any conductive fillers into the composites, which increase complexity, and leads to an increased dielectric losses.

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Flexible Piezoelectric Touch Sensor by Alignment of Lead‐Free Alkaline Niobate Microcubes in PDMS

Cited by 112 publications

References 32 publications

Recent Progress on Piezoelectric, Pyroelectric, and Magnetoelectric Polymer‐Based Energy‐Harvesting Devices

Recent Progress on Piezoelectric, Pyroelectric, and Magnetoelectric Polymer‐Based Energy‐Harvesting Devices

Flexible Multifunctional Sensors for Wearable and Robotic Applications

The effect of the intrinsic electrical matrix conductivity on the piezoelectric charge constant of piezoelectric composites

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