Advanced Electrostatic Sensors and Actuators

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (10 February 2023) | Viewed by 3358

Special Issue Editor

Coulomb Electrostatics and Mechanochemistry Laboratory, Universidade Federal de Santa Maria, Av. Roraima 1000, Camobi, Santa Maria 97105-900, RS, Brazil
Interests: electrostatic phenomena; triboelectrification; flexoelectricity; tribology; functional materials; electromechanical coupling; atomic force microscopy

Special Issue Information

Dear Colleagues, 

Electrostatics has challenged well-established ideas and substituted them for new concepts for 30 years. Electrostatic phenomena were too often quoted as “poorly understood”, but many recent works have established a much more solid foundation. Now, many important electrostatics-based sensor and actuator devices have been appearing as important solutions for low-power off-grid or stand-alone renewable energy technologies. In fact, mechanical-to-electrical transducers based on piezo-, flexo-, hygro-, or triboelectricity are playing a central role in low-energy power consumption devices, such as Internet of Things (IoT), wearable electronics, and other low power systems. Therefore, this Special Issue aims to showcase research papers and review articles that focus on electrostatic phenomena for the development of sensor and actuator devices, including the modeling for mechanical-to-electrical coupling mechanisms and/or hygroelectricity. 

We look forward to receiving your submissions!

Dr. Thiago Augusto Lima Burgo
Guest Editor

Manuscript Submission Information

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Keywords

  • triboelectric devices
  • flexoelectricity
  • electromechanical coupling
  • hygroelectricity
  • sensors and actuators

Published Papers (2 papers)

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Research

13 pages, 2565 KiB  
Article
Flexible, Heat-Durable, and Highly Sensitive Piezoelectrets from Cyclic Olefin Copolymer with Microhoneycomb Structure
by Hui Wang, Xiaolin Wang and Changchun Zeng
Micromachines 2023, 14(4), 829; https://doi.org/10.3390/mi14040829 - 08 Apr 2023
Cited by 2 | Viewed by 1201
Abstract
This paper discusses the fabrication and characterization of cyclic olefin copolymer (COC)-based pseudo-piezoelectric materials (piezoelectrets) with exceptionally high piezoelectric activity, and their potential use in sensing applications. Piezoelectrets that utilize a novel microhoneycomb structure to achieve high piezoelectric sensitivity are carefully engineered and [...] Read more.
This paper discusses the fabrication and characterization of cyclic olefin copolymer (COC)-based pseudo-piezoelectric materials (piezoelectrets) with exceptionally high piezoelectric activity, and their potential use in sensing applications. Piezoelectrets that utilize a novel microhoneycomb structure to achieve high piezoelectric sensitivity are carefully engineered and fabricated at a low temperature using a supercritical CO2-assisted assembly. The quasistatic piezoelectric coefficient d33 of the material can reach up to 12,900 pCN−1 when charged at 8000 V. The materials also exhibit excellent thermal stability. The charge build-up in the materials and the actuation behavior of the materials are also investigated. Finally, applications of these materials in pressure sensing and mapping and in wearable sensing are demonstrated. Full article
(This article belongs to the Special Issue Advanced Electrostatic Sensors and Actuators)
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10 pages, 3410 KiB  
Article
Dual-Passband SAW Filter Based on a 32°YX-LN/SiO2/SiC Multilayered Substrate
by Huiping Xu, Sulei Fu, Rongxuan Su, Peisen Liu, Rui Wang, Fei Zeng, Cheng Song, Weibiao Wang and Feng Pan
Micromachines 2023, 14(2), 479; https://doi.org/10.3390/mi14020479 - 18 Feb 2023
Cited by 2 | Viewed by 1864
Abstract
To meet the demands of highly integrated and miniaturized radio frequency front-end (RFFE) modules, multi-passband filters which support multi-channel compounding come to the foreground. In this work, we proposed a new design of a dual-passband surface acoustic wave (SAW) filter based on a [...] Read more.
To meet the demands of highly integrated and miniaturized radio frequency front-end (RFFE) modules, multi-passband filters which support multi-channel compounding come to the foreground. In this work, we proposed a new design of a dual-passband surface acoustic wave (SAW) filter based on a 32°YX-LiNbO3 (LN)/SiO2/SiC multilayered structure. The filter is of a standalone ladder topology and comprises dual-mode resonators, in which the shear horizontal (SH) mode and high-order SH mode are simultaneously excited through electrode thickness modulation. The impact of electrode thickness on the performance of the dual-mode resonator was systematically investigated by the finite element method (FEM), and resonators were prepared and verified the simulation results. The electromechanical coupling coefficients (K2) of the SH modes are 15.1% and 17.0%, while the maximum Bode-Q (Qmax) values are 150 and 247, respectively, for the fabricated resonators with wavelengths of 1 μm and 1.1 μm. In terms of the high-order SH modes in these resonators, the K2 values are 9.8% and 8.4%, and Qmax values are 190 and 262, respectively. The fabricated dual-band filter shows the center frequencies (fc) of 3065 MHz and 4808 MHz as two bands, with 3-dB fractional bandwidths (FBW) of 5.1% and 5.9%, respectively. Such a dual-band SAW filter based on a conventional ladder topology is meaningful in terms of its compact layout and diminished area occupancy. This work provides a promising avenue to constitute a high-performance dual-passband SAW filter for sub-6 GHz RF application. Full article
(This article belongs to the Special Issue Advanced Electrostatic Sensors and Actuators)
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