2,116 results match your criteria: "School of Electronic Science and Engineering[Affiliation]"

Energy-Efficient Reservoir Computing Based on Solution-Processed Electrolyte/Ferroelectric Memcapacitive Synapses for Biosignal Classification.

J Phys Chem Lett

August 2024

National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China.

The classification of critical physiological signals using neuromorphic devices is essential for early disease detection. Physical reservoir computing (RC), a lightweight temporal processing neural network, offers a promising solution for low-power, resource-constrained hardware. Although solution-processed memcapacitive reservoirs have the potential to improve power efficiency as a result of their ultralow static power consumption, further advancements in synaptic tunability and reservoir states are imperative to enhance the capabilities of RC systems.

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Composition Modulation-Mediated Band Alignment Engineering from Type I to Type III in 2D vdW Heterostructures.

Adv Mater

September 2024

School of Physics and Key Laboratory of Quantum Materials and Devices of Ministry of Education, Southeast University, Nanjing, 211189, China.

Band alignment engineering is crucial for facilitating charge separation and transfer in optoelectronic devices, which ultimately dictates the behavior of Van der Waals heterostructures (vdWH)-based photodetectors and light emitting diode (LEDs). However, the impact of the band offset in vdWHs on important figures of merit in optoelectronic devices has not yet been systematically analyzed. Herein, the regulation of band alignment in WSe/BiTe Se vdWHs (0 ≤ x ≤ 3) is demonstrated through the implementation of chemical vapor deposition (CVD).

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Defect single-photon emitters (SPE) in gallium nitride (GaN) have garnered great attentions in recent years due to the advantages they offer, including the ability to operate at room temperature, narrow emission linewidths, and high brightness. Nevertheless, the precise nature of the single-photon emission mechanism remains uncertain due to the multitude of potential defects that can form in GaN. In this work, our systematical investigation with the ab initio calculation indicates that carbon and silicon, as common dopants in gallium nitride, can interact with intrinsic defects in GaN and form new high-speed defect single-photon sources.

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Solution-Processable Microstructuring of 1T'-Phase Janus MoSSe Monolayers for Boosted Hydrogen Production.

J Am Chem Soc

August 2024

Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Xi'an Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, Xi'an 710129, China.

Janus monolayers of transition metal dichalcogenides (TMDs) offer versatile applications due to their tunable polymorphisms. While previous studies focused on conventional 2H-phase Janus monolayers, the scalable synthesis of an unconventional 1T' phase remains challenging. We present a novel solution strategy for fabricating Janus 1T'-MoOSe and MoSSe monolayers by growing sandwiched Se-Mo-O/S shells onto Au nanocores.

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Tunable Ag Nanocavity Enhanced Green Electroluminescence from SiN:O Light-Emitting Diode.

Nanomaterials (Basel)

August 2024

School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.

Article Synopsis
  • Highly efficient silicon-based light emission is essential for developing optoelectronic integrated chips, and this research demonstrates a significant enhancement in green electroluminescence (EL) using oxygen-doped silicon nitride (SiN:O) paired with a silver (Ag) nanocavity array.
  • The study shows that the green EL from the SiN:O combined with the Ag nanocavity array can increase up to 7.1 times compared to a pure SiNO device, with a 3-fold improvement in external quantum efficiency for specific nanocavity diameters.
  • The findings suggest that the localized surface plasmon resonance of the tunable Ag nanocavity arrays with SiN:O films is crucial for achieving
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Broad bandwidth and excellent thermal stability in BiScO-PbTiO high-temperature ultrasonic transducer for non-destructive testing.

Ultrasonics

September 2024

Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address:

High-temperature ultrasonic transducer (HTUT) is essential for non-destructive testing (NDT) in harsh environments. In this paper, a HTUT based on BiScO-PbTiO (BS-PT) piezoelectric ceramics was developed, and the effect of different backing layers on its bandwidth were analyzed. The HTUT demonstrates a broad bandwidth and excellent thermal stability with operation temperature up to 400 °C.

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Advances in the application of non-contact temperature measurement technology for aero-engine blade.

Rev Sci Instrum

August 2024

State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084 Beijing, China.

The advancement of the aviation sector has made the temperature measurement technology for aero-engine turbine blades essential for maintaining the engine's safe and steady performance. The non-contact temperature measurement technology is a trending research focus in turbine blade temperature measurement due to its benefits of not requiring direct touch with the object being measured and its suitability for high-temperature and high-speed conditions. This paper provides a concise overview of various key non-contact temperature measurement methods for aero-engines, such as fluorescence temperature measurement, fiber-optic temperature measurement, and radiation temperature measurement.

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Mn-inlaid antiphase boundaries in perovskite structure.

Nat Commun

August 2024

Anhui Province Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, China.

Improvements in the polarization of environmentally-friendly perovskite ferroelectrics have proved to be a challenging task in order to replace the toxic Pb-based counterparts. In contrast to common methods by complex chemical composition designs, we have formed Mn-inlaid antiphase boundaries in Mn-doped (K,Na)NbO thin films using pulsed laser deposition method. Here, we observed that mono- or bi-atomic layer of Mn has been identified to inlay along the antiphase boundaries to balance the charges originated from the deficiency of alkali ions and to induce the strain in the KNN films.

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In this paper, an improved CKF (Cubature Kalman Filter) target tracking method is adopted to solve the tracking and pointing problem in the field of the Active Denial System. The math model of the system is built and the precision requirement is analyzed. The improved CKF method is input as the feedforward compensation for system control to improve the system tracking performance.

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Taking Photoacoustic Force into Account in Liquid-Phase Peak Force Infrared Microscopy.

J Phys Chem Lett

August 2024

School of Electronic Science and Engineering, Fujian Key Laboratory of Ultrafast Laser Technology and Applications, College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China.

The microscopic structure of the material's solid-liquid interface significantly influences its physicochemical properties. Peak force infrared microscopy (PFIR) is a powerful technique for analyzing these interfaces at the nanoscale, revealing crucial structure-activity relationships. PFIR is recognized for its explicit photothermal signal generation mechanism but tends to overlook other photoinduced forces, which can disturb the obtained infrared spectra, thereby reducing spectral signal-to-noise ratio (SNR) and sensitivity.

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Rational design and construction of direct Z-scheme ternary heterojunction photocatalyst AgBr/CoWO/Ag for efficient environmental remediation.

Environ Res

November 2024

National Key Laboratory of Science and Technology on Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou 730000, China. Electronic address:

The indiscriminate discharge of micropollutants (e.g., dyes, antibiotics, industrial additives, etc.

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To improve the portability of magnets in gyrotron devices, we designed a compact Bitter-type magnet with power consumption optimization theory. This magnet operates at room temperature in a small volume. The theory revises existing electromagnetic theory for non-uniform structural Bitter-type magnets and achieves the lowest energy consumption through iterative optimization.

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Anisotropic phonon dynamics in Dirac semimetal PtTe thin films enabled by helicity-dependent ultrafast light excitation.

Light Sci Appl

August 2024

Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, State Key Laboratory of Spintronics Devices and Technologies, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.

Coherent phonons have aroused considerable attention in condensed matter physics owing to their extraordinary capacity of reflecting and controlling the physical properties of matter. However, the investigation on the interaction between coherent phonons and other microscopic particles on the ultrafast timescale within topological systems continues to be an active and unresolved area. Here, we show the energy transfer of coherent optical phonons (COP) in Dirac semimetal PtTe thin films using ultrafast optical pump-probe spectroscopy.

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Background: When applied to thermoacoustic imaging (TAI), the delay-and-sum (DAS) algorithm produces strong sidelobes due to its disadvantages of uniform aperture weighting. As a result, the quality of TAI images recovered by DAS is often severely degraded by strong non-coherent clutter, which restricts the development and application of TAI.

Purpose: To address this issue, we propose an adaptive complementary neighboring sub-aperture (NSA) beamforming algorithm for TAI.

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Lorentz Force-Actuated Bidirectional Nanoelectromechanical Switch with an Ultralow Operation Voltage.

Nano Lett

September 2024

School of Electronic Science and Engineering, National Laboratory of Solid-State Microstructures, Nanjing University, 210023 Nanjing, China.

The high operating voltage of conventional nanoelectromechanical switches, typically tens of volts, is much higher than the driving voltage of the complementary metal oxide semiconductor integrated circuit (∼1 V). Though the operating voltage can be reduced by adopting a narrow air gap, down to several nanometers, this leads to formidable manufacturing challenges and occasionally irreversible switch failures due to the surface adhesive force. Here, we demonstrate a new nanowire-morphed nanoelectromechanical (NW-NEM) switch structure with ultralow operation voltages.

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In this paper, we present a new type of isolator based on one-way surface magnetoplasmons (SMPs) at microwave frequencies, and it is the first time that an experimental prototype of isolator with wideband and ultra-high isolation is realized using SMP waveguide. The proposed model with gyromagnetic and dielectric layers is systematically analyzed to obtain the dispersion properties of all the possible modes, and a one-way SMP mode is found to have the unidirectional transmission property. In simulation and experiment with metallic waveguide loaded with yttrium-iron-garnet (YIG) ferrite, the scattering parameters and the field distributions agree well with the analysis and verify the one-way transmission property.

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Integration of Perylene Diimide into a Covalent Organic Framework for Photocatalytic Oxidation.

Angew Chem Int Ed Engl

November 2024

State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.

Perylene diimides (PDIs) have garnered considerable attention due to their immense potential in photocatalysis. However, manipulating the molecular packing within their aggregates and enhancing the efficiency of photogenerated carrier recombination remain significant challenges. In this study, we demonstrate the incorporation of a PDI unit into a covalent organic framework (COF), named PDI-PDA, by linking an ortho-substituted PDI with p-phenylenediamine (PDA) to control its intermolecular aggregation.

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Photoelectrochemical/Colorimetric Dual-Mode Specific Detection of Based on the Enzymatic Reaction Triggered by Catalase from Lysed Bacteria.

Anal Chem

August 2024

Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

() is abundant in nature and frequently leads to various health issues. Bacteriophages as obligate intracellular parasites of bacteria have the ability to specifically identify and infect , causing bacterial lysis and the release of endogenous catalase (CAT). The released CAT triggers the conversion of HO into O and HO, resulting in a notable decrease in UV absorption at 570 nm and a concurrent surge in photocurrent.

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Understanding the relationship between sequences and kinetics of DNA strand displacements.

Nucleic Acids Res

September 2024

State Key Laboratory of Physical Chemistry of Solid Surface, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.

Article Synopsis
  • Understanding the kinetic modulation of toehold-mediated DNA strand displacements (TMSD) is crucial for advances in DNA nanotechnology, as the toehold sequence impacts the kinetics significantly.
  • Machine learning was used to analyze the complex relationship between TMSD kinetics and the toehold sequence, revealing key factors that influence rate constants, such as the number of free hydrogen bonding sites and bases.
  • A predictive model was developed that accurately estimates TMSD rate constants, even accommodating subtle variations in toehold sequences.
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ConspectusOver the past two decades, terahertz (THz) technology has undergone rapid development, driven by advancements and the growing demand for THz applications across various scientific and technological domains. As the cornerstone of THz technology, strong THz-matter interactions, especially realized as high THz intrinsic absorption in nanometer-thick materials, play a highly important role in various applications including but not limited to THz absorption/shielding, detection, etc. The rigorous electromagnetic theory has posited a maximum intrinsic absorption of 50% for electromagnetic waves by thin films, and the succinct impedance matching condition has also been formulated to guide the design of highly intrinsically absorbing materials.

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The synthesis and supercapacitor application of flexible free-standing TiCT, MoTiCT, and VCT MXene films.

Nanoscale

August 2024

Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, International Center for Dielectric Research, Shaanxi Engineering Research Center of Advanced Energy Materials and Devices, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.

Article Synopsis
  • MXenes are two-dimensional materials made of transition metal carbides and nitrides, drawing attention in energy storage due to their varied electrochemical properties based on elemental composition.* -
  • Three types of delaminated MXenes (d-TiCT, d-MoTiCT, and d-VCT) were created using different synthesis methods and were made into flexible film electrodes for testing their performance in various aqueous electrolytes and temperatures.* -
  • The study found that d-VCT MXene offers superior energy storage capabilities, achieving a specific capacitance of 292.0 F/g in acidic conditions, significantly outpacing other variants and highlighting the importance of interlayer spacing in energy storage efficiency.*
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Preparation of liquid silicon-based carbon dots and application for luminescent solar concentrators.

Luminescence

July 2024

Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, China.

Liquid silicon-based carbon dots (CDs) with a photoluminescence quantum yield (PLQY) of 50% were prepared using N-[3-(trimethoxysilyl)propyl]ethylenediamine (DAMO), citric acid, and n-butylamine as raw materials. Firstly, the optimized characters have been determined, namely, the optimal DAMO, citric acid, and n-butylamine addition amounts of 1 mL, 0.9 g, and 1 mL, a reaction time of 3 h, and a reaction temperature of 160°C.

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Systematic investigation on the rational design and optimization of bi-based metal oxide semiconductors in photocatalytic applications.

Nanotechnology

August 2024

Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China.

Article Synopsis
  • Exploring new photocatalysts is crucial to tackle global energy shortages and reduce greenhouse gas emissions through renewable resources.
  • Bi-based metal oxide (BiMO) semiconductors have shown enhanced photocatalytic activity, with their diverse compositions allowing for tailored designs to improve performance in specific uses.
  • The study analyzed the electronic and optical characteristics of various BiMO materials, demonstrating tunable band gaps and effective charge carrier separation, which aligns with experimental results on their catalytic efficiency.
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Accelerating multipool CEST MRI of Parkinson's disease using deep learning-based Z-spectral compressed sensing.

Magn Reson Med

December 2024

Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, School of Electronic Science and Engineering, National Model Microelectronics College, Xiamen University, Xiamen, China.

Purpose: To develop a deep learning-based approach to reduce the scan time of multipool CEST MRI for Parkinson's disease (PD) while maintaining sufficient prediction accuracy.

Method: A deep learning approach based on a modified one-dimensional U-Net, termed Z-spectral compressed sensing (CS), was proposed to recover dense Z-spectra from sparse ones. The neural network was trained using simulated Z-spectra generated by the Bloch equation with various parameter settings.

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Bidirectional, Multilayer MXene/Polyimide Aerogels for Ultra-Broadband Microwave Absorption.

Adv Mater

September 2024

Micro- and Nanotechnology Research Center, State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.

To obtain high-performance electromagnetic microwave (EM) absorption materials with broad effective absorption bandwidth (EAB) and reduced thickness, designing structures has proved to be a promising way. Herein, ultra-broadband multilayer bidirectional MXene/polyimide EM absorption aerogels containing multi-structures on scales ranging from the micro- to the macroscale are produced with the aid of electric and temperature fields. On the microscale, under the action of electric force and temperature gradient, the ordered structures made of aligned TiCT MXene nanosheets and the microscale layered aerogel walls enable the bidirectional aerogel to achieve a wide EAB of 8.

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