Results 51 to 60 of about 22,436 (254)

Smart Face Masks as Wearable Respiratory Sensors: A Review of Sensor Technologies, Materials, and Future Directions

Advanced Healthcare Materials, EarlyView.
This review highlights recent advances in smart face masks that actively monitor breathing. By integrating humidity, gas, temperature, pressure, strain, and triboelectric sensors, these masks track key respiratory parameters in real time. The article summarizes sensor mechanisms, compares performance across studies, and discusses challenges and future ...
Negin Faramarzi, Naseeh Backer Kannanthodi, Alice Nicole Casling, Babar Ali, Samira Lakouraj Mansouri, Alessandro Giuseppe D'aloia, Hossein Cheraghi Bidsorkhi, Maria Sabrina Sarto   +7 more
wiley   +1 more source

Analysis of a Cascaded Piezoelectric Ultrasonic Transducer with Three Sets of Piezoelectric Ceramic Stacks

Sensors, 2019
To increase the ultrasonic intensity and power of a piezoelectric transducer, a cascaded piezoelectric ultrasonic transducer with the three sets of piezoelectric ceramic stacks is analyzed.
Xiangdi Meng, Shuyu Lin
doaj   +1 more source

Preparation, Characterization, and Application of AlN/ScAlN Composite Thin Films

Micromachines, 2023
Piezoelectric aluminum nitride (AlN) thin film, as a commonly used material for high-frequency acoustic resonators, has been a research hotspot in the RF field. Doping Sc elements in AlN is one of most effective methods to improve the piezoelectricity of
Laixia Nian, Yuanhang Qu, Xiyu Gu, Tiancheng Luo, Ying Xie, Min Wei, Yao Cai, Yan Liu, Chengliang Sun   +8 more
doaj   +1 more source

Dynamic Behavior in Piezoresponse Force Microscopy

, 2005
Frequency dependent dynamic behavior in Piezoresponse Force Microscopy (PFM) implemented on a beam-deflection atomic force microscope (AFM) is analyzed using a combination of modeling and experimental measurements.
Abplanalp M, Alexe M, Arthur P Baddorf, Bdikin I K, Burnham N A, Eng L M, Frederix P, Ganpule C, Hirsekorn S, Hong S, Jesse S, Kalinin S V, Kalinin S V, Kalinin S V, Karapetian E, Persson B N J, Rabe U, Rabe U, Sarid D, Sergei V Kalinin, Stephen Jesse, Tiedke S, Timoshenko S, Turner J A   +23 more
core   +1 more source

The Simulation of Resonant Mode and Effective Electromechanical Coupling Coefficient of Lithium Niobate Crystal with Different Orientations

Journal of Physics: Conference Series, 2020
Abstract At present, the proportion and role of thin film bulk acoustic wave (FBAR) filters in mobile communication products are becoming more and more obvious due to its higher work frequency and smaller size. As a commonly used piezoelectric material, aluminum nitride (AlN) limits the bandwidth of the FBAR filter because of its small ...
Xiaoyuan Bai, Yao Shuai, Wenbo Luo, Chuangui Wu, Wanli Zhang   +4 more
openaire   +1 more source

Self‐Assembled Inorganic Nanomembrane Tubes: Rolled‐Up Piezoelectrics for Microacoustic Wave‐Based Actuators and Sensors

Advanced Materials, EarlyView.
This study demonstrates a self‐assembly process to generate free‐standing piezoelectric nanomembranes, forming ultracompact microtubular acoustic wave sensors and actuators. The miniaturized 3D piezoelectric platform reported in this work can be applied in telecommunication, energy harvesting, and acoustofluidics. Moreover, the 3D self‐assembly can add
Raphaël C. L‐M. Doineau, Christian N. Saggau, Stefan Baunack, Thomas Gemming, Yara Abdelaal, Robert Weser, Oliver G. Schmidt, Hagen Schmidt, Andreas Winkler, Mariana Medina‐Sánchez   +9 more
wiley   +1 more source

Intelligent Acousto‐Electrical Metamaterials (IAM) for Sound Source Detection

Advanced Materials, EarlyView.
Our proposed metamaterial concept enables sound source detection using a single material, in contrast to conventional arrays that require dozens or even hundreds of transducers. We show that the coupled acoustic–vibrational–electrical responses in piezoelectric metamaterials give rise to topology‐governed charge transport, producing distinct voltage ...
Victor Couëdel, Haotian Lu, Jiayan Zhang, Desheng Yao, Ananya Bhardwaj, Ramiro Contreras, Karim Sabra, Xiaoyu (Rayne) Zheng   +7 more
wiley   +1 more source

Flexible Dielectric Acoustic Resonator Patch for Tissue Regeneration

Advanced Materials, EarlyView.
A flexible dielectric acoustic resonator patch enables MHz‐range ultrasound generation through resonance amplification without using piezoelectric materials. Conformal integration on a curved substrate allows efficient acoustic delivery to tissue‐mimicking environments.
Donyoung Kang, Byeongseok Ryu, Sujeong Ahn, Junhyub Kim, Myeonghun Jang, Jeong Ho Cho, Won‐Gun Koh, Hyungsuk Lee   +7 more
wiley   +1 more source

Effect of Filling Material Properties on 1-3 Piezoelectric Composite Performance

Micromachines
The 1-3 piezoelectric composite is the key component of the acoustic transducer, which is widely used in detection, due to the high energy conversion efficiency, cheap raw material, and low aging. To reveal the influence of epoxy mixture, used to connect
Yao Liu, Yang Zhou, Zhigang Zhao, Jinjie Zhou   +3 more
doaj   +1 more source

Simulation and fabrication of high frequency piezoelectric micromachined ultrasonic transducer based on PZT film

上海师范大学学报. 自然科学版, 2023
Piezoelectric micromachined ultrasonic transducer (PMUT) is hotspot in the study of biomedicine ultrasonic imaging. Lead zirconate titanate (PbZrO3-PbTiO3, PZT) piezoelectric film is the key piezoelectric material used in micromechanical ultrasonic ...
LIU Yaqi, CHEN Mingzhu, ZHANG Qiaozhen, ZHAO Xiangyong, WANG Jushan, TANG Yanxue, WANG Feifei, WANG Shuhao, WANG Yaojin, MIAO Bin, LI Jiadong   +10 more
doaj   +1 more source