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The transition metal dichalcogenide (TMDC) NbSe is a highly conductive and superconducting material with great potential for next-generation electronic and optoelectronic devices. However, its bulk form suffers from reduced charge density and conductivity due to interlayer van der Waals interactions. To address this, we exfoliated NbSe₂ into nanosheets using lithium-ion intercalation and utilized them as diaphragms in acoustic transducers. Conventional electromagnetic and electrostatic mechanisms have limitations in sound pressure level (SPL) performance at high and low frequencies, respectively. To overcome this, we developed a hybrid force mechanism combining the strengths of both approaches. The NbSe₂ nanosheets were successfully prepared and analyzed, and the NbSe-based hybrid acoustic transducer (N-HAT) demonstrated significantly improved SPL performance across a wide frequency range. This study offers a novel approach for designing high-performance acoustic devices by harnessing the unique properties of NbSe.
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http://dx.doi.org/10.3390/ma18040763 | DOI Listing |
Adv Mater
September 2025
School of Fashion and Textiles, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, 999077, P. R. China.
Fiber-reinforced polymer composite mechanical metamaterials have emerged as promising candidates for multifunctional structural applications owing to their exceptional strength-to-weight ratios. However, achieving concurrent high stiffness, high strength, and large recoverable strain in such structures remains challenging due to inherent trade-offs between these properties. To address this limitation, a novel Möbius-inspired metamaterial through optimized fiber orientation design is developed.
View Article and Find Full Text PDFMicromachines (Basel)
July 2025
Department of Electrical Engineering, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620, USA.
This paper presents a novel approach employing localized annealing through Joule heating to enhance the performance of Thin-Film Piezoelectric-on-Silicon (TPoS) MEMS resonators that are crucial for applications in sensing, energy harvesting, frequency filtering, and timing control. Despite recent advancements, piezoelectric MEMS resonators still suffer from anchor-related energy losses and limited quality factors (), posing significant challenges for high-performance applications. This study investigates interface modification to boost the quality factor () and reduce the motional resistance, thus improving the electromechanical coupling coefficient and reducing insertion loss.
View Article and Find Full Text PDFSensors (Basel)
August 2025
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Accurate stress evaluation of structural components during manufacturing and operation is essential for ensuring the safety and reliability of advanced equipment in aerospace, defense, and other high-performance fields. However, existing electromagnetic ultrasonic stress detection methods are often limited by low signal amplitude and limited adaptability to complex environments, hindering their practical deployment for in situ testing. This study proposes a novel surface wave transducer structure for stress detection based on acoustoelastic theory combined with electromagnetic ultrasonic technology.
View Article and Find Full Text PDFMater Horiz
August 2025
Intelligent Materials and Systems Laboratory, Institute of Technology, University of Tartu, Nooruse 1, Tartu 50411, Estonia.
The increasing global concern over low-frequency noise pollution necessitates innovative solutions capable of effective acoustic attenuation across varying environments. However, conventional acoustic metamaterials, characterized by fixed geometries, typically provide limited flexibility in adjusting the functional frequency range once constructed. This study revisited the classic acoustic metamaterial configurations and proposed two novel tunable acoustic absorbing structures through a strategic integration with high-performance photo-active polymer actuators.
View Article and Find Full Text PDFJ Mech Behav Biomed Mater
August 2025
Technische Universität Dresden, Carl Gustav Carus Faculty of Medicine, Clinic of Otorhinolaryngology, Head and Neck Surgery, Ear Research Center Dresden, Fetscherstraße 74, 01307 Dresden, Germany. Electronic address:
Myringoplasty is a routine surgery to restore the hearing of patients with a subacute and chronic tympanic membrane (TM) perforation. Electrospun scaffolds as a new art of synthetic TM replacement have a great potential to overcome the drawbacks of currently used autologous tissues due to the nano- and microfibers. Most recently with the development of tissue engineering, efforts have been made to mimic the radial and circular fiber arrangement of human TM to generate comparable acoustic vibration and mechanical stability.
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