Ultrahigh piezoelectricity in lead-free piezoceramics by synergistic design

Wang, Dawei; Fan, Z. Hugh; Rao, Guanghui; Wang, Ge; Liu, Yao; Yuan, Changlai; Ma, Tao; Li, Dejun; Tan, Xiaoli; Lu, Zhilun; Feteira, Antônio; Liu, Shiyu; Zhou, Changrong; Zhang, Shujun

doi:10.1016/j.nanoen.2020.104944

Cited by 121 publications

(65 citation statements)

References 46 publications

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“…For instance, Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 [ 33 ], BiFeO 3 [ 34 ] and (K, Na)NbO 3 -based [ 35 – 37 ] materials were reported to fabricate piezoelectric nanogenerators for energy harvesting and human motion sensing. Recently, it is found that stannum-doped BaTiO 3 (BTS) ferroelectric ceramics have the highest piezoelectric coefficient ( d 33 ) in lead-free piezoceramics with a low Curie temperature ( T c ) of ~ 40 °C[ 38 ]. It is well known that the sensors based on hard ceramics will lose piezoelectricity due to the depolarization phenomenon once the work temperature is higher than T c .…”

Section: Introductionmentioning

confidence: 99%

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

Zheng

Liu

et al. 2021

Nano-Micro Lett.

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For traditional piezoelectric sensors based on poled ceramics, a low curie temperature (Tc) is a fatal flaw due to the depolarization phenomenon. However, in this study, we find the low Tc would be a benefit for flexible piezoelectric sensors because small alterations of force trigger large changes in polarization. BaTi0.88Sn0.12O3 (BTS) with high piezoelectric coefficient and low Tc close to human body temperature is taken as an example for materials of this kind. Continuous piezoelectric BTS films were deposited on the flexible glass fiber fabrics (GFF), self-powered sensors based on the ultra-thin, superflexible, and polarization-free BTS-GFF/PVDF composite piezoelectric films are used for human motion sensing. In the low force region (1–9 N), the sensors have the outstanding performance with voltage sensitivity of 1.23 V N−1 and current sensitivity of 41.0 nA N−1. The BTS-GFF/PVDF sensors can be used to detect the tiny forces of falling water drops, finger joint motion, tiny surface deformation, and fatigue driving with high sensitivity. This work provides a new paradigm for the preparation of superflexible, highly sensitive and wearable self-powered piezoelectric sensors, and this kind of sensors will have a broad application prospect in the fields of medical rehabilitation, human motion monitoring, and intelligent robot.

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Section: Introductionmentioning

confidence: 99%

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

Zheng

Liu

et al. 2021

Nano-Micro Lett.

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“…These applications motivated researchers to investigate the existence of MPB in the novel promising ceramic compounds, e.g., PbHfO 3 –PbTiO 3 –Pb(Mg 1/3 Nb 2/3 )O 3 , [ 10,11 ] lead‐free BiFeO 3 –BaTiO 3 , [ 12,13 ] Pb(In 1/2 Nb 1/2 )O 3 –Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 , [ 14 ] PbSnO 3 –Pb (Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 , [ 15 ] and BiScO 3 –PbTiO 3 –Pb(Cd 1/3 Nb 2/3 )O 3 , [ 16 ] and even present new methods to induce MPB into the ordinary FE ceramics, e.g., BaTiO 3 . [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric and Dielectric Properties of Hf_0.5Zr_0.5O₂ Thin Film Near Morphotropic Phase Boundary

Kashir

Hwang

2021

Physica Status Solidi (a)

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Since the discovery of ferroelectric (FE) properties in HfO 2 -based materials, [1] numerous advantages, such as simple structures, strong binding energy between oxygen and transition metal ions, large bandgap (%5.3-5.7 eV), and compatibility with current complementary metal-oxide semiconductor technologies, led to extensive research that focused on potential diverse applications, such as FE memory, ferroelectric field-effect transistors (Fe-FETs), pyroelectric sensors, and energy harvesters. Meanwhile, from the material survey of FEs, it is conventional that the structural phase transition induced by a compositional change plays a special role in obtaining excellent piezoelectric and dielectric properties. [2][3][4][5][6][7][8][9] The phase boundary known as morphotropic phase boundary (MPB) separates regions of different symmetries by varying their composition in FEs. [2][3][4][5][6][7][8][9] In fact, when different structural phases are almost degenerated near the MPB, rotations of polarization occur in response to external electric fields instead of a change in the magnitude of polarization. [5] Consequently, materials exhibit maximum piezoelectric and dielectric responses near the MPB, as several phases coexist, and there is nearly no energy barrier separating them. The MPB has garnered significant practical interest, because the variable that drives the transition (i.e., compositions) is inherent. Therefore, it provides an alternative approach to boost the dielectric constant ϵ r without degrading the bandgap. MPB ceramics are the basis of a wide range of piezoelectric and dielectric technologies, such as high-k materials, sensors, actuators, smart systems, ultrasound generation, and sensing and underwater acoustics. These applications motivated researchers to investigate the existence of MPB in the novel promising ceramic compounds, e.g., PbHfO 3 -PbTiO 3 -Pb(Mg 1/3 Nb 2/3 )O 3 , [10,11] lead-free BiFeO 3 -BaTiO 3 , [12,13] Pb(In 1/

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“…Parameters such as the length and distance between the dipoles in the piezoelectric sensor change with the applied force, resulting in an increase in the charge and voltage. [20][21][22][23] Therefore, piezoelectric sensors require no additional power supply. They have a high sensitivity and a fast response speed to dynamic pressure.…”

mentioning

confidence: 99%

Flexible and Stretchable Capacitive Sensors with Different Microstructures

et al. 2021

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Recently, sensors that can imitate human skin have received extensive attention. Capacitive sensors have a simple structure, low loss, no temperature drift, and other excellent properties, and can be applied in the fields of robotics, human-machine interactions, medical care, and health monitoring. Polymer matrices are commonly employed in flexible capacitive sensors because of their high flexibility. However, their volume is almost unchanged when pressure is applied, and they are inherently viscoelastic. These shortcomings severely lead to high hysteresis and limit the improvement in sensitivity. Therefore, considerable efforts have been applied to improve the sensing performance by designing different microstructures of materials. Herein, two types of sensors based on the applied forces are discussed, including pressure sensors and strain sensors. Currently, five types of microstructures are commonly used in pressure sensors, while four are used in strain sensors. The advantages, disadvantages, and practical values of the different structures are systematically elaborated. Finally, future perspectives of microstructures for capacitive sensors are discussed, with the aim of providing a guide for designing advanced flexible and stretchable capacitive sensors via ingenious human-made microstructures.

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Ultrahigh piezoelectricity in lead-free piezoceramics by synergistic design

Cited by 121 publications

References 46 publications

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

Ferroelectric and Dielectric Properties of Hf_0.5Zr_0.5O₂ Thin Film Near Morphotropic Phase Boundary

Flexible and Stretchable Capacitive Sensors with Different Microstructures

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Ultrahigh piezoelectricity in lead-free piezoceramics by synergistic design

Cited by 121 publications

References 46 publications

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

Superflexible and Lead-Free Piezoelectric Nanogenerator as a Highly Sensitive Self-Powered Sensor for Human Motion Monitoring

Ferroelectric and Dielectric Properties of Hf0.5Zr0.5O2 Thin Film Near Morphotropic Phase Boundary

Flexible and Stretchable Capacitive Sensors with Different Microstructures

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Ferroelectric and Dielectric Properties of Hf_0.5Zr_0.5O₂ Thin Film Near Morphotropic Phase Boundary