Ferroelectric-dielectric composite pressure sensor

Thakur, Vikas N.; Zafer, Afaqul; Yadav, Sanjay; Kumar, Ashok

doi:10.1016/j.sna.2019.111536

Cited by 21 publications

(8 citation statements)

References 38 publications

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“…Such types of results for phase transition temperatures and dielectric permittivity for Cu 2+ and Bi 3+ modified BT based ceramics have also been reported in the literature [21, 22, 2426, 46]. BCZTCB shows more temperature stability for dielectric properties in comparison to BCZT and BCZTC which makes it suitable for a high dielectric constant capacitor within a long temperature range [47].…”

Section: Temperature-dependent Dielectric Analysissupporting

confidence: 68%

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Kumari

Kumar

et al. 2021

J Mater Sci: Mater Electron

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Perovskite typeBa0.98Ca0.02Zr0.02Ti0.98O3 (BCZT), Ba0.98Ca0.02Zr0.02Ti0.976Cu0.008O3 (BCZTC) and Ba0.9725Bi0.005Ca0.02Zr0.02Ti0.976Cu0.008O3(BCZTCB) lead-free ceramics were synthesised via solid-state reaction method at a sintering temperature of ~1380 °C. Effects of CuO and Bi2O3/CuO doping on structural, microstructural, dielectric, and ferroelectric properties were investigated systematically. X-ray diffraction technique confirmed the existence of pure perovskite phase with the tetragonal structure in pure and in the doped BCZT ceramics at room temperature. The dielectric analysis demonstrated two anomalies around 24 °C and 126 °C for BCZT, which were identified as orthorhombic to tetragonal (TO-T) and tetragonal to cubic (TC) phase transition temperature, respectively. The TO-T temperature shifted to below 16 °C, while the TC increased to 132 °C for the BCZTCB sample. The physical mechanisms of the conduction processes were investigated through impedance spectroscopy and the values of resistance, conductivity, and activation energies associated with the grain and grain boundaries were evaluated. The activation energy was determined to be higher for doped samples than for pure BCZT. Further, the dopant-dependent ferroelectric nature of the ceramic samples was evidenced by the analysis of characteristic hysteresis loop, and a value of remnant polarisation (Pr = 4.59 C/cm 2 ) was obtained for the BCZTCB ceramic sample. Furthermore, the d33 value, which was 54 pC/N for pure BCZT, was determined to be 140 pC/N and 64 pC/N for BCZTC and BCZTCB, respectively.

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Section: Temperature-dependent Dielectric Analysissupporting

confidence: 68%

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Kumari

Kumar

et al. 2021

J Mater Sci: Mater Electron

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“…Therefore, self-powering systems, particularly piezoelectric devices, have been widely studied in conjunction with various nanoscale materials [ 19 ]. Piezoelectricity refers to energy harvesting from various external forces, such as heat, pressure, and electric fields, and includes ferroelectricity, pyroelectricity, and piezoelectricity [ 20 , 21 , 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Combined Triboelectric and Piezoelectric Effect in ZnO/PVDF Hybrid-Based Fiber-Structured Nanogenerator with PDMS:Carbon Black Electrodes

Thakur

Han

2022

Polymers

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We report a fiber-structured hybrid nanogenerator wearable device fabricated on a single polyethylene terephthalate (PET) textile cylindrical substrate. The device can be described as a capacitor with inner and outer carbon-black-dispersed poly dimethyl siloxane (PDMS:Carbon black) electrodes, and zinc oxide and polyvinylidene fluoride (PVDF) as the dielectric medium between the electrodes. The compositional analysis in terms of X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy of the synthesized ZnO/PVDF has been measured and analyzed. The combined effect of triboelectricity between PDMS:Carbon black and PVDF, and piezoelectricity in a ZnO/PVDF hybrid, was investigated. Current–voltage characteristics were observed with varying load from 0–20 g, and resistance was observed to be decreased with load. Compared to earlier reports, there was a significant enhancement in voltage (≈5.1 V) and current (≈92.5 nA) at 10 g. Due to the introduction of interfacial polarization between PVDF and ZnO, the piezoelectric properties and pressure sensitivity of the hybrid ZnO/PVDF is enhanced. The hysterical behavior in the device’s response while measuring voltage and current with varying time shows the signature of the triboelectric effect between PVDF and ZnO, as well as PDMS:Carbon black and ZnO/PVDF layers. Reduction of triboelectric behavior was confirmed with increasing relaxation time. Because of the enhancement in piezoelectricity, fiber-structured nanogenerator (FNG) ZnO/PVDF proved to a potential candidate to be used for wearable computing devices, such as smart watches and sports bracelets.

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“…Pressure sensors are actively used in advanced applications in robots [ 1 , 2 , 3 ], human-machine interaction systems [ 4 , 5 ], healthcare monitors [ 6 , 7 , 8 ], and energy harvesting [ 9 , 10 , 11 ]. Various pressure sensors based on ceramics and polymers have been proposed in recent years [ 12 , 13 , 14 ]. In particular, a variety of polymer-based flexible sensor devices for collecting biometric information have been studied for their applicability in human healthcare monitoring [ 15 , 16 ], wearable devices [ 17 , 18 ], and medical diagnosis tools [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

A Highly Sensitive and Flexible Capacitive Pressure Sensor Based on Alignment Airgap Dielectric

Kim

Lee

et al. 2022

Sensors

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Flexible capacitive pressure sensors with a simple structure and low power consumption are attracting attention, owing to their wide range of applications in wearable electronic devices. However, it is difficult to manufacture pressure sensors with high sensitivity, wide detection range, and low detection limits. We developed a highly sensitive and flexible capacitive pressure sensor based on the porous Ecoflex, which has an aligned airgap structure and can be manufactured by simply using a mold and a micro-needle. The existence of precisely aligned airgap structures significantly improved the sensor sensitivity compared to other dielectric structures without airgaps. The proposed capacitive pressure sensor with an alignment airgap structure supports a wide range of working pressures (20–100 kPa), quick response time (≈100 ms), high operational stability, and low-pressure detection limit (20 Pa). Moreover, we also studied the application of pulse wave monitoring in wearable sensors, exhibiting excellent performance in wearable devices that detect pulse waves before and after exercise. The proposed pressure sensor is applicable in electronic skin and wearable medical assistive devices owing to its excellent functional features.

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Ferroelectric-dielectric composite pressure sensor

Cited by 21 publications

References 38 publications

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Structural, dielectric and ferroelectric properties of Cu2+- and Cu2+/Bi3+-doped BCZT lead-free ceramics: a comparative study

Combined Triboelectric and Piezoelectric Effect in ZnO/PVDF Hybrid-Based Fiber-Structured Nanogenerator with PDMS:Carbon Black Electrodes

A Highly Sensitive and Flexible Capacitive Pressure Sensor Based on Alignment Airgap Dielectric

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