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Anomalously High Dielectric Strength and Capacitive Energy Density of Thin Entangled Glassy Polymer Films.
JACS Au
January 2025
Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States.
The influence of high-intensity electric fields on the stability of polymeric materials is a problem of interest in the design of next-generation energy storage and electronic devices, and for understanding the limits of stability of polymer films exposed to large electric fields generally. Here, we show that the dielectric strength of entangled glassy polymer films increases as an inverse power-law of the film thickness for "ultrathin" films below a micron in thickness. The dielectric strength enhancement in these polymer films becomes as large as ≈2 GV/m in films thinner than 100 nm, but in this thickness regime, the increase of the dielectric strength depends strongly on the polymer mass, sample aging time, and the method of film preparation.
View Article and Find Full Text PDFA Reliable High-Performance Floating-Gate Transistor Based on ZrS Native Oxidation for Optoelectronic Synergistic Artificial Synapses.
ACS Appl Mater Interfaces
January 2025
Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, Henan Normal University, Xinxiang 453007, China.
Floating-gate transistors (FGTs), considered the most promising structure among three-terminal van der Waals (vdW) synaptic transistors, possess superiorities in improved data retention, excellent endurance properties, and multibit storage capacity, thereby overcoming the von Neumann bottleneck in conventional computing architectures. However, the dielectric layer in FGT devices typically depends on atomic layer deposition or mechanically transferred insulators, posing several challenges in terms of device compatibility, manufacturing complexity, and performance degradation. Therefore, it is crucial to discover dielectrics compatible with two-dimensional (2D) materials for further simplifying FGT structures and achieving optimal performance.
View Article and Find Full Text PDFMonolithic electrostatic actuators with independent stiffness modulation.
Nat Commun
January 2025
Department of Bioengineering, Imperial College London, London, UK.
Robotic artificial muscles, inspired by the adaptability of biological muscles, outperform rigid robots in dynamic environments due to their flexibility. However, the intrinsic compliance of the soft actuators restricts force transmission capacity and dynamic response. Biological muscle modulates their stiffness and damping, varying viscoelastic properties and force in interaction with the surroundings.
View Article and Find Full Text PDFSuperior energy storage capacity of polymer-based bilayer composites by introducing 2D ferroelectric micro-sheets.
Nat Commun
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School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, China.
Dielectric polymer capacitors suffer from low discharged energy density and efficiency due to their low breakdown strength, small dielectric constant and large electric hysteresis. Herein, a synergistic enhancement strategy is proposed to significantly increase both breakdown strength and dielectric constant while suppressing hysteresis, through introducing 2-dimensional bismuth layer-structured NaBiTiO micro-sheets and designing a unique bilayer structure. Excitingly, an ultra-high discharged energy density of 25.
View Article and Find Full Text PDFUltrathin Terahertz-Wave Absorber Based on Inorganic Materials for 6G Wireless Communications.
ACS Appl Mater Interfaces
January 2025
Nippon Denko Co., Ltd., 1-4-16 Yaesu, Chuo-ku, Tokyo 103-8282, Japan.
Terahertz waves are gathering attention as carrier waves for next-generation wireless communications such as sixth-generation wireless communication networks and autonomous driving systems. Electromagnetic-wave absorbers for the terahertz-wave region are necessary to ensure information security and avoid interference issues. Herein we report a high-performance terahertz-wave absorber composed of a composite of metallic λ-TiO and insulating TiO nanocrystals (λ-TiO@TiO).
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