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arXiv 2024年

作者： Gowda, Chinmayee Chowde Kartsev, Alexey Tiwari, Nishant Safronov, A.A. Pandey, Prafull Roy, Ajit K. Ajayan, Pulickel M. Galvão, Douglas S. Tiwary, Chandra Sekhar School of Nano Science and Technology Indian Institute of Technology West Bengal Kharagpur721302 India Computing Center of the Far Eastern Branch The Russian Academy of Sciences Khabarovsk680000 Russia MIREA-Russian Technological University Moscow119454 Russia 6 Miklukho-Maklaya St Moscow117198 Russia Department of Metallurgical and Materials Engineering Indian Institute of Technology West Bengal Kharagpur721302 India Materials Engineering Indian Institute of Technology Gandhinagar Gujurat 382055 India Materials and Manufacturing Directorate Air Force Research Laboratory Wright Patterson AFBOH45433-7718 United States Department of Materials Science and NanoEngineering Rice University 6100 S Main Street HoustonTX77005 United States Applied Physics Department and Computational Engineering and Sciences State University of Campinas SP Campinas13083-970 Brazil

Two-dimensional (2D) chromium telluride Cr2Te3 exhibits strong ferromagnetic ordering with high coercivity at low temperatures and paramagnetic behavior when approaching room temperature. The spin states of monolayer Cr2Te3 shows ferromagnetic ordering in the ground state, and in-situ Raman analysis shows reversible structure transformation and hence ferromagnetic to paramagnetic transition during low-temperature heating cycles (0 - 25 °C). The magnetic phase transition near room temperature in the 2D Cr2Te3 prompted the study of these layered material exploration for energy application. We demonstrate that the low-temperature ferromagnetic behavior can be used to magnetically deice material surfaces using an external magnetic source, avoiding the use of harsh chemicals and high temperatures. The hydrophobic nature and dipole interactions of H2O molecules with the surface of the 2D Cr2Te3 coating aid in the condensation of ice droplets formed on the surface. First-principles calculations also confirm the observed crystal structure, surface interaction, and magnetic properties of 2D Cr2Te3 © 2024, CC BY.

关键词： Density functional theory

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Enhancing dye degradation in darkness: The role of SnO2 nanorod clusters in flexocatalysis

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Chemical engineering Journal 2024年 494卷

作者： Chang, Nai-Jen Chen, Yu-Ching Lai, Sz-Nian Ming Wu, Jyh Department of Materials Science and Engineering National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan Program in Prospective Functional Materials Industry National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan High Entropy Materials Center National Tsing Hua University 101 Section 2 Kuang Fu Road Hsinchu300 Taiwan

Flexoelectricity is present in all dielectric materials and exhibits spontaneous electrical polarization when subjected to a strain gradient. In the present study, low-dimensional, pinecone-like tin oxide (SnO2) nanorod clusters demonstrated favorable flexocatalytic properties during a dye degradation experiment in which light irradiation was excluded;the catalytic activity was driven solely by mechanical force. Notably, the SnO2 lattice did not have a non-centrosymmetrical structure, indicating the absence of a piezoelectric effect. However, the nanoscale structure exhibited notable flexocatalysis under ultrasonic vibration. During the aforementioned dye degradation experiment, the concentration of dye molecules underwent nearly complete degradation under ultrasonic treatment. The corresponding rate constant was 0.484 hr-1, indicating a 28-fold improvement compared with commercially available SnO2 nanoparticles. Further characterization revealed that the as-synthesized SnO2 exhibited abundant oxygen vacancies. Through heat treatment at multiple temperatures, the concentration of oxygen vacancies was systematically reduced, and this reduction demonstrated a negative correlation with dye degradation efficiency. Within this system, oxygen vacancies played a pivotal role in modifying the band structure, thereby hindering the recombination rate of electron-hole pairs. This behavior indicates a notable enhancement in flexocatalysis efficiency with the elevation of defect concentration through thermal treatment. The present study demonstrated the viability of flexocatalysis for SnO2 with a wide band gap and highlighted the synergistic effect of defects, even in the absence of light, to present a promising strategy for polluted water treatment applications. © 2024 Elsevier B.V.

关键词： Oxygen vacancies

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Deep Brain Optoacoustic Stimulation Enabled by a Multifunctional Fiber-based Optoacoustic Emitter

Deep Brain Optoacoustic Stimulation Enabled by a Multifuncti...

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Optics and the Brain, BRAIN 2022

作者： Zheng, Nan Jiang, Ying Jiang, Shan Li, Yueming Jia, Xiaoting Yang, Chen Cheng, Ji-Xin Division of Materials Science and Engineering Boston University BostonMA02215 United States Graduate Program for Neuroscience Boston University BostonMA02215 United States Photonics Center Boston University BostonMA02215 United States Department of Mechanical Engineering Boston University BostonMA02215 United States Department of Biomedical Engineering Boston University BostonMA02215 United States Department of Chemistry BostonMA02215 United States

Optoacoustic neurostimulation is a non-genetic light-mediated technique allows high precise control of neural activities. Here, we combined optoacoustic stimulation and electrophysiological recording to achieve bidire... 详细信息

ISBN: (纸本)9781957171036

关键词： Electrophysiology

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A Robust Bendable Irox Thin Film Via Mild Alkaline Solution Process for Neuron Stimulating Electrodes

SSRN

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SSRN 2023年

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Pan, Shih-Chin Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Wu, Pu-Wei Chen, Po-Chun Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Takayama Ikoma Nara8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV-Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm2-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2% of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023, The Authors. All rights reserved.

关键词： Iridium compounds

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Performance Enhancement of Electrochemiluminescence with the Immunosensor Controlled Using Magnetized Masks for the Determination of Epithelial Cancer Biomarker EpCAM

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Analytical Chemistry 2023年第2期95卷 986-993页

作者： Huang, Chun-Yao Lin, Feng-Yen Chang, Chi-Jung Lu, Chien-Hsing Chen, Jem-Kun Taipei Heart Institute Taipei Medical University 250 Wu-Hsing Street Taipei110 Taiwan Division of Cardiology and Cardiovascular Research Center Taipei Medical University Hospital 252 Wu-Hsing Street Taipei110 Taiwan Department of Internal Medicine School of Medicine College of Medicine Taipei Medical University 250 Wu-Hsing Street Taipei110 Taiwan Department of Biomedical Sciences and Engineering National Central University 300 Zhongda Road Taoyuan City320317 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Sec. 4 Keelung Road Taipei106 Taiwan Department of Chemical Engineering Feng Chia University 100 Wenhwa Road Taichung40724 Taiwan Department of Obstetrics and Gynecology Taichung Veterans General Hospital 1650 Taiwan Boulevard Sect. 4 Taichung40705 Taiwan Institute of Biomedical Sciences Ph.D. Program in Translational Medicine Rong-Hsing Research Center for Translational Medicine National Chung-Hsing University Taichung940227 Taiwan

The performance of an electrochemiluminescence (ECL) immunosensor was improved with a particle gradient. SiO2-coated magnetic beads were adopted as nanocarriers for gradient manipulation and immobilized with the primary antibody. Cadmium telluride quantum dots were coated with a layer of protein G for conjugation and orientation of the secondary antibody as signal labels. ECL immunosensor gradients on the electrode were formed by magnetolithography (ML) with magnetized nickel masks of column and stripe arrays. The immunosensor generally aggregated as an island on the substrate, leading to a decrease of efficiency in the characteristic signals. Stripe arrays of magnetized nickel were designed to generate cylindrical magnetic flux on the substrate to improve the particle manipulation with the gradient. Various gradients of the sandwich-structured immunosensor substantially affected the electrochemical performance. Compared to the gradient-free immunosensor, the gradient of the immunosensor generated by ML using a 3 μm stripe array mask enhanced the ECL intensity ∼2.2 times. The results of quantification of epithelial cell adhesion molecules (EpCAM) with the gradient immunosensor showed a broad linear range (15-420 pg mL-1), a low limit of detection (5.5 pg mL-1), and high reliability for EpCAM-spiked serum samples, indicating that the immunosensor gradient substantially enhances the performance of the ECL assay. © 2022 American Chemical Society.

关键词： Immunosensors

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Growth of Gd0.3ca2.7co3.82cu0.18o9-Δ-Bace0.6zr0.2y0.2o3-Δ Bulk Heterojunction Cathode Interlayer by Pulsed Laser Deposition for Enhancing Protonic Solid Oxide Fuel Cell Performance

SSRN

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SSRN 2023年

作者： Umer, Muhammad Abdullah Cheng, Cheng-Yang Lai, Bo-Ruei Tseng, Chung-Jen Chen, Szu-Yuan Lee, Sheng-Wei Molecular Science and Technology program Taiwan International Graduate Program Academia Sinica Taipei City106923 Taiwan Department of Physics National Central University Taoyuan City320317 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei City106923 Taiwan Institute of Materials Science and Engineering National Central University Taoyuan City320317 Taiwan Department of Mechanical Engineering National Central University Taoyuan City320317 Taiwan Department of Chemical and Materials Engineering National Central University Taoyuan City320317 Taiwan

The triple-conducting (e-/H+/O2-) oxides have been extensively studied as the most promising cathode materials for protonic solid oxide fuel cells (P-SOFCs) because of their excellent catalytic activity at lower operating temperatures. However, direct application of these cathode materials by brush-painting or screen-printing provides limited contact area with the underlying electrolyte layer, resulting in high cathode ohmic and polarization resistances. In this study, it is demonstrated that a bulk heterojunction Gd0.3Ca2.7Co3.82Cu0.18O9-δ (GCCCO)-BaCe0.6Zr0.2Y0.2O3-δ (BCZY) layer with a domain width of ~5 nm can be grown by pulsed laser deposition (PLD) via spontaneous phase separation. Such a nanocomposite interlayer between spin-coated BCZY electrolyte and brush-painted GCCCO cathode can effectively increases the interfacial area between the two distinct phases and facilitates proton transport across the interface. This electrode design reduces the ohmic resistance by 0.35 Ω cm2 and the polarization resistance by a factor of three, thus significantly boosting the cell performance. © 2023, The Authors. All rights reserved.

关键词： Pulsed laser deposition

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Effect of Heat Treatment on Improving Oer Activity of Nifeooh Based Aerogels: A Combined Experimental and Theoretical Study

SSRN

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SSRN 2024年

作者： Lakhanlal Rimon, Or Moschkowitsch, Wenjamin Elbaz, Lior Toroker, Maytal Caspary Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel Bar Ilan University Ramat-Gan52900 Israel The Nancy and Stephen Grand Technion Energy Program Technion - Israel Institute of Technology Haifa3200003 Israel

Enhanced catalytic activity of oxygen evolution reaction (OER) catalysts can make water electrolysis more efficient. This study focuses on the use of a simple strategy of heat treatment to enhance the catalytic activity of NiFeOOH-based aerogels. The study shows that heat treatment of this aerogel at 150 °C leads to significant improvement in its catalytic activity, as evident in the staircase voltammetry results. To understand how heat treatment improves the catalytic activity, a DFT+U calculation was carried out on heat-treated and non-heat treated catalysts. The calculation shows that the overpotential for OER decreases with heat treatment, which is related to the relative stability of the intermediates in heat-treated and non-heat treated catalysts. Also, it has been found that heat treatment decreases work function, which might improve charge transfer and, thus, catalytic activity. Our calculations are in line with the experimental results that demonstrate the potential of controlling water content on catalytic efficiency. © 2024, The Authors. All rights reserved.

关键词： Heat treatment

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Peak thermal conductivity measurements of boron arsenide crystals

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Physical Review materials 2022年第6期6卷 L061601-L061601页

作者： Yuanyuan Zhou Chunhua Li Pawan Koirala Geethal Amila Gamage Hanlin Wu Sheng Li Navaneetha K. Ravichandran Hwijong Lee Andrei Dolocan Bing Lv David Broido Zhifeng Ren Li Shi Walker Department of Mechanical Engineering The University of Texas at Austin Austin Texas 78712 USA Department of Physics Boston College Chestnut Hill Massachusetts 02467 USA Department of Physics The University of Texas at Dallas Richardson Texas 75080 USA Department of Physics and Texas Center for Superconductivity University of Houston Houston Texas 77204 USA Department of Mechanical Engineering Indian Institute of Science Bangalore 560012 India Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin Texas 78712 USA

Recent experiments have validated prior theories of unusual high thermal conductivity (κ) in boron arsenide (BAs) and revealed large κ variation associated with extended and point defects in the samples. The peak κ provides valuable insights into the competition between intrinsic phonon-phonon scattering processes and extrinsic boundary and defect scattering processes in BAs. However, prior measurement methods have not been able to measure the peak κ because of fundamental and technical limitations. Here, we report peak κ measurements of BAs crystals synthesized under different conditions with source materials of different purities via a vapor transport method. For three representative samples, the measured κ peak appears at temperatures between 120 and 150 K and varies from 410±60Wm−1K−1 to 830±100Wm−1K−1. The measured thermal conductivities agree with theoretical calculations across the full temperature range. The similar calculated and measured peak temperatures helps to narrow down the boundary scattering mean free path to be around 4 μm in two samples and 5 μm in another, while the variation of the peak magnitude reveals a one-order-of-magnitude difference in the strength of point defect scattering. The phonon-defect scattering behavior correlates well with the measured electronic Raman scattering background, the impurity concentrations revealed by secondary ion mass spectroscopy, and the Hall concentration and mobility of the p-type samples except for an anomalously high hole concentration that appears in one sample, which indicates nonuniform impurity distribution. The observed correlation clarifies the origins of extrinsic phonon scattering mechanisms in BAs crystals.

关键词： Crystal defects Hall effect Heat transfer Impurities Phonons Thermal conductivity Thermal properties

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Direct-Write NiO RRAM Cells

Direct-Write NiO RRAM Cells

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Electronic Components and Technology Conference (ECTC)

作者： Jordan Howard-Jennings Riadh Al-Haidari Emuobosan Enakerakpo Abdullah Obeidat Kevin Bell Tom Rovere Stephen Gonya Mohammed Alhendi Mark Poliks Materials Science & Engineering Program Binghamton University Binghamton NY United States Department of Systems Science & Industrial Engineering Binghamton University Binghamton NY United States Lockheed Martin Rotary and Mission Systems Lockheed Martin Corporation Owego NY United States The Center for Advanced Microelectronics Manufacturing Binghamton University Binghamton NY United States

ISBN: (数字)9798350375985

ISBN: (纸本)9798350375992

As electronic devices and their internal components have become more advanced, conventional computer memory technologies – which are a key component of all electronics – have struggled to fully keep up with this advancement. Meeting the demands of computer memory in modern electronics requires a zero-sum game approach of optimizing several, often competing performance benchmark criteria. Resistive random-access memory (RRAM) is an emerging nonvolatile memory (NVM) technology with great appeal due to its ease of fabrication, low programming voltage, fast read/write times, compatibility with existing CMOS platforms, and demonstrated scalability into tiny dimensions thus enabling a higher density and smaller footprint. We fabricated NiO-based RRAM cells using aerosol jet printing to investigate the performance of direct-writing as an alternative method for RRAM cell fabrication compared to conventional techniques (e.g. sputtering, layer deposition, etc.). A fabricated NiO-based RRAM cell, with a NiO layer thickness of 0.426 μm and a cell area of 0.154 mm 2 , demonstrated a clearly separated high and low resistance state when a dual voltage sweep was applied across the two cell electrode terminals. Preliminary results show that NiO-RRAM aerosol jet printed cells can exhibit resistive switching, indicating that direct write methods can be used to fabricate many cells per batch with material layer thicknesses that, while thicker than what can be achieved using conventional techniques, are just as functional.

关键词： Fabrication Electrodes Scanning electron microscopy Temperature distribution Nonvolatile memory Voltage Switches

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Bulk high-entropy hexaborides

arXiv

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arXiv 2021年

作者： Qin, Mingde Yan, Qizhang Liu, Yi Wang, Haoren Wang, Chunyang Lei, Tianjiao Vecchio, Kenneth S. Xin, Huolin L. Rupert, Timothy J. Luo, Jian Program of Materials Science and Engineering Department of NanoEngineering University of California San Diego San diegoCA92093 United States Department of Physics and Astronomy University of CaliforniaIrvine IrvineCA92697 United States Department of Materials Science and Engineering Department of Mechanical and Aerospace Engineering University of California Irvine IrvineCA92697 United States

For the first time, a group of CaB6-typed cubic rare earth high-entropy hexaborides have been successfully fabricated into dense bulk pellets (>98.5% in relative densities). The specimens are prepared from elemental precursors via in-situ metal-boron reactive spark plasma sintering. The sintered bulk pellets are determined to be single-phase without any detectable oxides or other secondary phases. The homogenous elemental distributions have been confirmed at both microscale and nanoscale. The Vickers microhardness are measured to be 16-18 GPa at a standard indentation load of 9.8 N. The nanoindentation hardness and Young's moduli have been measured to be 19-22 GPa and 190-250 GPa, respectively, by nanoindentation test using a maximum load of 500 mN. The material work functions are determined to be 3.7-4.0 eV by ultraviolet photoelectron spectroscopy characterizations, which are significantly higher than that of LaB6. © 2021, CC BY.

关键词： Pelletizing

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