Distributed flexoelectric structural sensing: Theory and experiment

Hu, S. D.; Li, H.; Tzou, H. S.

doi:10.1016/j.jsv.2015.03.016

Cited by 49 publications

(19 citation statements)

References 25 publications

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“…Tzou and co-workers have reported a distributed system for structural sensing by flexoelectricity. 86 A group of BST ceramic sensors were distributed on a cantilever flexoelectric beam and their flexoelectric constants were found consistent by the open-circuit model. An alternative for dynamic measurements of mechanical structures was provided.…”

Section: Devices: Sensors Energy Harvester and Microphonementioning

confidence: 84%

Flexoelectricity in dielectrics: Materials, structures and characterizations

Huang

et al. 2018

J. Adv. Dielect.

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Flexoelectricity in dielectrics suggests promising smart structures for sensors, actuators and transducers. In this review, dielectric materials, structures and the associated flexoelectric characterization methods are presented. First of all, we review structures and methods to measure different flexoelectric coefficients, including [Formula: see text], etc., via direct or converse flexoelectric effect. The flexoelectric materials in the form of bulk, thin films and 2D materials and the reported flexoelectric properties of these dielectrics will then be discussed. Semiconductor materials and the associated flexoelectric studies will also be reviewed. The progress of flexoelectric device study will next be presented, followed by the flexoelectricity research challenges and future trend.

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Section: Devices: Sensors Energy Harvester and Microphonementioning

confidence: 84%

Flexoelectricity in dielectrics: Materials, structures and characterizations

Huang

et al. 2018

J. Adv. Dielect.

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“…13–16 Distributed sensing signal based on the double-curvature shell structures had been studied, which can be simplified to beams, cylindrical shells, circular rings and conical shell. 17–20 When considering the external resistance of the external devices, flexoelectric energy harvesters are designed to harvest the vibration energy and closed-loop circuit and flexoelectric energy harvesting theory are studied. 21–24 Since the flexoelectric effect is significant in nanoscale, flexoelectric energy harvester with surface effect in nanoscale is also studied.…”

Section: Introductionmentioning

confidence: 99%

Flexoelectric control of beams with atomic force microscope probe excitation

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Based on the converse flexoelectric effect, flexoelectric actuator is designed and used to control the dynamic displacement of cantilever beams. First, shell-type stress expression based on double-curvature shell induced by the converse flexoelectric effect is developed, which can be simplified to a flexoelectric-laminated cantilever beam by applying two Lamé parameters and beam radius of curvature. Then, the flexoelectric actuator is designed with a conductive atomic force microscope probe and a flexoelectric layer. An inhomogeneous electric field is generated when the external voltage is applied on the atomic force microscope probe and the flexoelectric layer, which leads to stress in the longitudinal direction of beam and control moment. With the flexoelectric-induced bending moment, displacement induced by the external force and flexoelectric actuator is derived. The displacement is related to many parameters, such as actuation voltage, atomic force microscope probe radius and flexoelectric layer thickness. Cases are studied to optimize the control effect with different parameters. Results show that vibration control effect is enhanced with a higher actuation voltage and a smaller atomic force microscope probe radius for each mode. Besides, the thicker flexoelectric layer enhances the control effect with a larger bending moment arm for each mode. Dynamic vibration is controlled effectively by converse flexoelectric effect.

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“…In this chapter, buffer layer such as LaNiO 3 thin film or MgO thin film were deposited on silicon substrate by RF magnetron sputtering. Here, both the effect of the sputtering parameters on the orientation of LNO thin film and the effect of the LNO/MgO buffer layer on the microstructure and dielectric properties of sputtered BST were studied [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Textured BST Thin Film on Silicon Substrate: Preparation and Its Applications for High Frequency Tunable Devices

Zhang¹,

Huang²,

Yang³

et al. 2019

Coatings and Thin-Film Technologies

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The dielectric properties of Ba 0.5 Sr 0.5 TiO 3 (BST) thin films are sensitive to the relative crystallographic orientation of the films. LaNiO 3 (LNO) and MgO were deposited as buffer layer on Si substrate before BST. The effect of buffer layer such as LNO, MgO and MgO/LNO bilayer on the microstructure and dielectric properties of BST were extensively investigated. The preferred (100) orientation of LNO by radio frequency (RF) magnetron sputtering was dominated by the substrate temperature and highly (100)-oriented LNO thin films were grown on Si substrates at 300°C. The oriented (100) growth of sputtered BST thin films was strongly affected by the orientation of LNO thin films and the tunability of BST thin film was greatly improved with the insertion of (100)-textured LNO buffer layer. In addition, MgO, as a buffer layer, was deposited by RF magnetron sputtering. The results show that the crystallization of BST was also enhanced by the insertion of MgO buffer layer, which enhances the oriental growth of BST along (100). Also, the tunability of the BST thin films was improved and the dielectric loss greatly decreased. Finally, CPW with BST/MgO multilayer was fabricated and the scattering (S) parameters were tested.

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Distributed flexoelectric structural sensing: Theory and experiment

Cited by 49 publications

References 25 publications

Flexoelectricity in dielectrics: Materials, structures and characterizations

Flexoelectricity in dielectrics: Materials, structures and characterizations

Flexoelectric control of beams with atomic force microscope probe excitation

Textured BST Thin Film on Silicon Substrate: Preparation and Its Applications for High Frequency Tunable Devices

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