Route towards sustainable smart sensors: ferroelectric polyvinylidene fluoride-based materials and their integration in flexible electronics

Stadlober, Barbara; Zirkl, Martin; Irimia‐Vladu, Mihai

doi:10.1039/c8cs00928g

Cited by 263 publications

(191 citation statements)

References 231 publications

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“…Piezoelectric capacitors use piezoelectric materials as the dielectric. The piezoelectric materials produce a voltage proportional to the applied pressure, due to breaking of symmetry in the chemical structure by external forces . The equivalent circuit model of a piezoelectric pressure sensor consists of a capacitor in series with a voltage source dependent on pressure .…”

Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

“…The equivalent circuit model of a piezoelectric pressure sensor consists of a capacitor in series with a voltage source dependent on pressure . Common piezoelectric polymers, such as polyvinylidene fluoride and its derivatives, have demonstrated fast microsecond response time, high sensitivity of 14 V kPa −1 , and a detection limit of 15 Pa . On the other hand, these materials are temperature sensitive, and the generated voltage dissipates under static conditions.…”

Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

“…TFTs are essential for pixel addressing and TFT‐based pressure sensors are integrated structures that enable scaling to large‐area active‐matrix arrays with high spatial resolution for obtaining pressure maps . This type of sensors has reached sensitivity of 102% change kPa −1 . There is built‐in current amplification in TFT sensors dependent on the applied V G and V SD biases, providing a knob to tune the current gain in exchange with power consumption.…”

Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

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Flexible Pressure Sensors for Objective Assessment of Motor Disorders

Amit

Chukoskie

Skalsky

et al. 2019

Adv Funct Materials

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Monitoring body motion is relevant to motor control disorders as well as assessment of fine motor skills in child development. Furthermore, motion tracking is necessary for rehabilitation monitoring and injury prevention and benefits both sick and healthy individuals. Flexible pressure sensors based on resistors, capacitors, inductors, or transistors are reviewed in the context of healthcare measurements, ranging from physiological signals to body movement characteristics such as grip and gait. To demonstrate the use of flexible pressure sensors for motor assessment, a touch sensing glove that evaluates fine motor skills in autism research is developed. The results show that autistic children perform fewer taps per minute compared to typically developing children, with larger variations in tap durations. In a second example, a force and motion sensing glove is developed to assess spasticity, a neuromuscular disorder that causes muscle stiffness/resistance and jerky movement. Analyses of force versus velocity show movement-dependent muscle resistance in a patient with spasticity. Through these flexible sensor systems, the shift from subjective scores to objective measurement will promote better diagnosis and dramatically improve the accuracy in tracking patient response to therapy.patients doing certain movements, and then clinicians rank each patient's level according to qualitative descriptions in benchmark classification scales. [12,13] The subjective scores can be inconsistent between raters and do not capture finelevel changes in a patient's progress in response to therapy. Therefore, there is a critical need to tackle the issue of imprecise assessment of motor disorders.With recent advances in flexible sensors and innovations in tactile sensing, [14][15][16][17][18][19] we have new low-cost technologies that are prime to facilitate quantitative evaluation of motor control. This progress report presents current developments in wearable sensor systems applicable to motor disorders, so that consistent, objective metrics become available to accurately track whether a treatment effectively relieves symptoms. The wearable sensors are not limited to placement on patients but can also be worn by clinicians or caregivers to assist them in taking measurements during patient interactions. [20,21] The point-of-care sensor systems will allow frequent monitoring, which is highly desirable to offer a better understanding of the patient's short and long-term response to therapies, to tailor treatment and improve outcome and quality of life for patients.Other reviews [14][15][16][17][18][19] have already extensively covered the flexible materials and devices used in tracking vital signs and electronic skin applications. In light of that, this progress report focuses on the applications in monitoring motor skills, in particular to implement pressure sensor designs for wearable systems with diverse form factors, for instance, gloves, [20,22,23] epidermal tags tags, [24,25] and shoe insoles. [26,27] We will discuss the mechanis...

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Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

Section: Sensor Designs and Mechanismsmentioning

confidence: 99%

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Flexible Pressure Sensors for Objective Assessment of Motor Disorders

Amit

Chukoskie

Skalsky

et al. 2019

Adv Funct Materials

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“…Since the beginning of the new millennium, strong efforts have been dedicated toward developing novel smart and multifunctional materials, and to integrate them into technological applications [1,3]. Such efforts represent a multidisciplinary research field with contributions and implications in the areas of sensors and actuators, energy, mobility, interactivity and biomedical sciences, among others [4].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Proximity Sensor Based on Magnetoelectric Composites and Printed Coils

et al. 2020

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Magnetic sensors are mandatory in a broad range of applications nowadays, being the increasing interest on such sensors mainly driven by the growing demand of materials required by Industry 4.0 and the Internet of Things concept. Optimized power consumption, reliability, flexibility, versatility, lightweight and low-temperature fabrication are some of the technological requirements in which the scientific community is focusing efforts. Aiming to positively respond to those challenges, this work reports magnetic proximity sensors based on magnetoelectric (ME) polyvinylidene fluoride (PVDF)/Metglas composites and an excitation-printed coil. The proposed magnetic proximity sensor shows a maximum resonant ME coefficient (α) of 50.2 Vcm −1 Oe −1 , an AC linear response (R 2 = 0.997) and a maximum voltage output of 362 mV, which suggests suitability for proximity-sensing applications in the areas of aerospace, automotive, positioning, machine safety, recreation and advertising panels, among others.

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“…Strong piezoelectricity in poly(vinylidene fluoride) (PVDF) was first reported by Kawai in 1969. [5][6][7][8][9][10][11] Based on the inverse piezoelectric effect, piezoelectric materials vibrate under alternating driving electric field. Therefore, research and application of piezoelectric polymers have attracted a lot of attention, although their piezoelectric sensitivity still cannot compete with that of some of their ceramic counterparts.…”

Section: Introductionmentioning

confidence: 99%

Fully Printed Piezoelectric Polymer Loudspeakers with Enhanced Acoustic Performance

et al. 2019

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Piezoelectric polymer loudspeakers have advantages like lightweight, flexibility, simple structure, and small volume, which make them favorable for a variety of applications. Herein, such loudspeakers are fabricated by screen printing the bottom and top electrodes (poly(3,4-ethylene-dioxythiophene):poly(styrenesulfonate), PEDOT:PSS) as well as the piezoelectric polymer layer (poly(vinylidene fluoride-trifluoroethylene), P(VDF-TrFE)), in between on paper substrates. The dielectric properties of the printed loudspeakers are studied with dielectric spectroscopy. Thanks to the self-healing process during poling, the samples are successfully poled to saturation in spite of their large area of up to 300 cm 2 . The dependence of the acoustic output on remanent polarization and the active area of the piezoelectric layer is investigated. A sound pressure level (SPL) of about 91 dB at a distance of 1 m is obtained with array samples of five rectangular units (10 Â 6 cm 2 in area each). In particular, samples with two loudspeaker arrays printed, respectively, on both surfaces of the paper substrates are prepared, and a further increase of 6 dB in SPL is achieved when the two loudspeakers are driven in phase. The results not only deepen the understanding of fully printed piezoelectric polymer loudspeakers but also realize an SPL much higher than that reported in previous studies.

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Route towards sustainable smart sensors: ferroelectric polyvinylidene fluoride-based materials and their integration in flexible electronics

Abstract: Printed ferroelectric devices are ideal candidates for self-powered and multifunctional sensor skins, contributing to a sustainable smart future.

Cited by 263 publications

References 231 publications

Flexible Pressure Sensors for Objective Assessment of Motor Disorders

Flexible Pressure Sensors for Objective Assessment of Motor Disorders

Magnetic Proximity Sensor Based on Magnetoelectric Composites and Printed Coils

Fully Printed Piezoelectric Polymer Loudspeakers with Enhanced Acoustic Performance

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