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Surfactant-assisted formation of robust p-Ag2O – n-BaTiO3 heterojunctions for visible-light photocatalytic applications

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Applied Surface science 2024年 655卷

作者： Chiu, Yen-Lun Chang, Kao-Shuo Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University No.1 University Road Tainan City70101 Taiwan Department of Materials Science & Engineering National Cheng Kung University No.1 University Road Tainan City70101 Taiwan

This paper reports the use of microwave-assisted hydrothermal and precipitation approaches to prepare a composite from a polyethylene glycol (PEG − 10000) surfactant-assisted dispersion of p-Ag2O particles in conjunction with n-BaTiO3 (n-BTO) for use in visible-light photocatalytic applications. The conductivities of p-Ag2O and n-BTO were determined through Mott–Schottky measurements and verified using energy band diagrams. Various PEG − 10000-treated and untreated (1 − x)BTO − xAg2O (x ≈ 57.0, 63.0, and 75.0 mol%, determined using Rietveld refinement) composites were prepared. X-ray photoelectron spectroscopy was used to determine the valence states and binding energies of the constituent elements in the various composites. Scanning electron microscopy, transmission electron microscopy, and particle-size distribution measurements revealed that Ag2O is excellently dispersed in the PEG − 10000-treated composite, which exhibited a remarkable surface area (≈10 m2⋅g−1) and pore volume (≈0.05 cm3⋅g−1) at x ≈ 63.0 mol%. All composites exhibited effective and reliable visible-light energy-harvesting capabilities. The PEG − 10000-treated composite (x ≈ 63.0 mol%) exhibited the most promising rhodamine B photodegradability, attributable to the formation of abundant p − n junctions and the effective absorption of visible light. An energy-band diagram was constructed to elucidate the potential mechanism responsible for this remarkable activity. Under visible light, our samples outperformed other similar and representative literature-reported samples under solar light. © 2024 Elsevier B.V.

关键词： Heterojunctions

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Large negative magnetoresistance in the off-stoichiometric topological semimetal PrSbxTe2−x

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Physical Review B 2025年第2期111卷 024421-024421页

作者： Gokul Acharya Krishna Pandey M. M. Sharma Jian Wang Santosh Karki Chhetri Md Rafique Un Nabi Dinesh Upreti Rabindra Basnet Josh Sakon Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Department of Chemistry and Biochemistry Wichita State University Wichita Kansas 67260 USA Department of Chemistry & Physics University of Arkansas at Pine Bluff Pine Bluff Arkansas 71603 USA Department of Chemistry and Biochemistry University of Arkansas Fayetteville Arkansas 72701 USA

Magnetic topological materials LnSbTe (Ln = lanthanide) have attracted intensive attention because of the presence of interplay between magnetism, topological, and electron correlations depending on the choices of magnetic Ln elements. Varying Sb and Te composition is an efficient approach to control structural, magnetic, and electronic properties. Here, we report on the composition-dependent properties in PrSbxTe2−x. We identified the tetragonal-to-orthorhombic structure transitions in this material system and very large negative magnetoresistance in the x=0.3 composition, which might be ascribed to the coupling between magnetism and transport. Such unusual magnetotransport enables PrSbxTe2−x topological materials as a promising platform for device applications.

关键词： Magnetoresistance

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Enhancing Zinc Electrode Stability Through Pre-Desolvation and Accelerated Charge Transfer via a Polyimide Interface for Zinc-Ion Batteries

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Small 2024年第35期20卷 e2401713页

作者： Lai, Chi-Yu Liao, Yin-Song Ku, Hao-Yu Jao, Wen-Yang Gull, Sanna Chen, Han-Yi Chou, Jyh-Pin Hu, Chi-Chang Department of Chemical Engineering National Tsing Hua University Hsinchu300044 Taiwan Tsing Hua Interdisciplinary Program National Tsing Hua University Hsinchu300044 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu300044 Taiwan Department of Physics National Changhua University of Education Changhua50074 Taiwan

Aqueous zinc-based energy storage devices possess superior safety, cost-effectiveness, and high energy density;however, dendritic growth and side reactions on the zinc electrode curtail their widespread applications. In this study, these issues are mitigated by introducing a polyimide (PI) nanofabric interfacial layer onto the zinc substrate. Simulations reveal that the PI nanofabric promotes a pre-desolvation process, effectively desolvating hydrated zinc ions from Zn(H2O)62+ to Zn(H2O)42+ before approaching the zinc surface. The exposed zinc ion in Zn(H2O)42+ provides an accelerated charge transfer process and reduces the activation energy for zinc deposition from 40 to 21 kJ mol−1. The PI nanofabric also acts as a protective barrier, reducing side reactions at the electrode. As a result, the PI-Zn symmetric cell exhibits remarkable cycling stability over 1200 h, maintaining a dendrite-free morphology and minimal byproduct formation. Moreover, the cell exhibits high stability and low voltage hysteresis even under high current densities (20 mA cm−2, 10 mAh cm−2) thanks to the 3D porous structure of PI nanofabric. When integrated into full cells, the PI-Zn||AC hybrid zinc-ion capacitor and PI-Zn||MnVOH@SWCNT zinc-ion battery achieve impressive lifespans of 15000 and 600 cycles with outstanding capacitance retention. This approach paves a novel avenue for high-performance zinc metal electrodes. © 2024 Wiley-VCH GmbH.

关键词： Charge transfer

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Surface Roughness-Induced Changes in Important Physical Features of CoFeSm Thin Films on Glass Substrates during Annealing

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materials 2023年第21期16卷 6989-6989页

作者： Fern, Chi-Lon Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Lu, Pei-Xin Su, Xuan-Ming Lin, Shih-Hung Lin, Ko-Wei Department of Materials Science and Engineering National Chung Hsing University Taichung40227 Taiwan Department of Materials Science and Engineering I-Shou University Kaohsiung84001 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

Co60Fe20Sm20 thin films were deposited onto glass substrates in a high vacuum setting. The films varied in thickness from 10 to 50 nm and underwent annealing processes at different temperatures: room temperature (RT), 100, 200, and 300 °C. Our analysis encompassed structural, magnetic, electrical, nanomechanical, adhesive, and optical properties in relation to film thickness and annealing temperature. X-ray diffraction (XRD) analysis did not reveal characteristic peaks in Co60Fe20Sm20 thin films due to insufficient growth-driving forces. Electrical measurements indicated reduced resistivity and sheet resistance with increasing film thickness and higher annealing temperatures, owing to hindered current-carrier transport resulting from the amorphous structure. Atomic force microscope (AFM) analysis showed a decrease in surface roughness with increased thickness and annealing temperature. The low-frequency alternating current magnetic susceptibility (χac) values increased with film thickness and annealing temperature. Nanoindentation analysis demonstrated reduced film hardness and Young’s modulus with thicker films. Contact angle measurements suggested a hydrophilic film. Surface energy increased with greater film thickness, particularly in annealed films, indicating a decrease in contact angle contributing to this increase. Transmittance measurements have revealed intensified absorption and reduced transmittance with thicker films. In summary, the surface roughness of CoFeSm films at different annealing temperatures significantly influenced their magnetic, electrical, adhesive, and optical properties. A smoother surface reduced the pinning effect on the domain walls, enhancing the χac value. Additionally, diminished surface roughness led to a lower contact angle and higher surface energy. Additionally, smoother surfaces exhibited higher carrier conductivity, resulting in reduced electrical resistance. The optical transparency decreased due to the smoother surface of C

关键词： Thin films

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Thickness, Annealing, and Surface Roughness Effect on Magnetic and Significant Properties of Co40Fe40B10Dy10 Thin Films

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materials 2023年第17期16卷 5995页

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Wang, Yu-Zhi Wu, Chueh-Lin Lin, Shih-Hung Ou, Sin-Liang Department of Materials Science and Engineering I-Shou University Kaohsiung84001 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Douliou64002 Taiwan Bachelor Program for Design and Materials for Medical Equipment and Devices Da-Yeh University Changhua51591 Taiwan

In this study, Co40Fe40B10Dy10 thin films were deposited using a direct current (DC) magnetron sputtering technique. The films were deposited on glass substrates with thicknesses of 10, 20, 30, 40, and 50 nm, and heat-treated in a vacuum annealing furnace at 100, 200, and 300 °C. Various instruments were used to examine and analyze the effects of roughness on the magnetic, adhesive, and mechanical properties. From the low frequency alternating current magnetic susceptibility (χac) results, the optimum resonance frequency is 50 Hz, and the maximum χac value tends to increase with the increase in the thicknesses and annealing temperatures. The maximum χac value is 0.18 at a film thickness of 50 nm and an annealing temperature of 300 °C. From the four-point probe, it is found that the resistivity and sheet resistance values decrease with the increase in film deposition thicknesses and higher annealing temperatures. From the magnetic force microscopy (MFM), the stripe-like magnetic domain distribution is more obvious with the increase in annealing temperature. According to the contact angle data, at the same annealing temperature, the contact angle decreases as the thickness increases due to changes in surface morphology. The maximal surface energy value at 300 °C is 34.71 mJ/mm2. The transmittance decreases with increasing film thickness, while the absorption intensity is inversely proportional to the transmittance, implying that the thickness effect suppresses the photon signal. Smoother roughness has less domain pinning, more carrier conductivity, and less light scattering, resulting in superior magnetic, electrical, adhesive, and optical performance. © 2023 by the authors.

关键词： Thin films

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Concurrent weak localization and double Schottky barrier across a grain boundary in bicrystal SrTiO3

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Physical Review B 2023年第10期107卷 104401-104401页

作者： M. Egilmez S. El-Khatib F. Mustafa S. Ahmad A. Di Bernardo J. W. A. Robinson Department of Physics American University of Sharjah Sharjah PO Box 26666 United Arab Emirates Materials Science and Engineering Program American University of Sharjah Sharjah PO Box 26666 United Arab Emirates Department of Physics University of Konstanz 78457 Konstanz Germany Department of Materials Science & Metallurgy University of Cambridge Cambridge CB3 0FS United Kingdom

Stoichiometric SrTiO3 (STO) is a wide band-gap insulator in which oxygen deficiency generates a low-temperature metallic ferromagnetic state. Here, we report weak ferromagnetic-like and metallic transport in oxygen-deficient bicrystal of STO with a low-temperature electron mobility and surface carrier density of 2800cm2V−1s−1 and 3.500×1016cm−2, respectively. Moreover, we show that magnetotransport behavior in the bulk and across the grain boundary (GB) in STO single crystals are significantly different. In the bulk, our magnetotransport results agree with those reported in the literature. Importantly, low-temperature magnetotransport across the GB shows a disorder-induced metal-insulator transition, and it is modeled as a quasi–two-dimensional system below 10 K that accounts for weak localization (WL), supported by electron-electron, electron-phonon, and Hikami-Larkin-Nagaoka (HLN) quantum interference models. The HLN model accounts for realistic length scales: the dephasing length Lϕ, and the spin-orbit (SO) scattering length LSO, which are comparable to the electron mean-free path, resembling the surface-conducting nature across the GB. Our experimental work shows the importance of structural defects in the interpretation of magnetotransport in SrTiO3 and shows that WL is concurrent with a double Schottky barrier at the GB interface.

关键词： Charge Electrical conductivity Localization Magnetic interactions Magnetism

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Effect of Ultrasound and Mixing of Folate and Trastuzumab Liposomes on DOX Release and Cellular Uptake

Effect of Ultrasound and Mixing of Folate and Trastuzumab Li...

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IEEE International Conference on Nano/Molecular Medicine and engineering (NANOMED)

作者： Nour M. AlSawaftah Willian G. Pitt Ghaleb A. Husseini Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah United Arab Emirates Chemical Engineering Department Brigham Young University Provo Utah United States Chemical and Biological Engineering Department College of Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (数字)9798331516994

ISBN: (纸本)9798331517007

This study explores the potential of physically mixing individually targeted Doxorubicin (DOX)-loaded liposomes functionalized with folic acid (FA) and trastuzumab (TRA), combined with ultrasound (US) triggering, to enhance targeted breast cancer therapy. This research focused on synthesizing, characterizing, and evaluating DOX release, cellular uptake, and cytotoxicity of FA-PEG and TRA-PEG-modified liposomes mixed at different volume fractions. Low-frequency ultrasound (LFUS) and high-frequency ultrasound (HFUS) were employed to trigger DOX release. The study demonstrated that the sonicated-physically-mixed liposomes showed superior release performance (specifically the M75 group) and increased cellular uptake (specifically the M25 group) compared to individually targeted liposomes, highlighting their combined potential in breast cancer treatment.

关键词： Ultrasonic imaging Medical treatment Breast cancer Drug delivery

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Disorder Dynamics in Battery Nanoparticles During Phase Transitions Revealed by Operando Single-Particle Diffraction (vol 11, 2103521, 2021)

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ADVANCED ENERGY materials 2022年第25期12卷 2201644-2201644页

作者： Huang, Jason J. Weinstock, Daniel Hirsh, Hayley Bouck, Ryan Zhang, Minghao Gorobtsov, Oleg Yu. Okamura, Malia Harder, Ross Cha, Wonsuk Ruff, Jacob P. C. Meng, Y. Shirley Singer, Andrej Department of Materials Science and Engineering Cornell University Ithaca NY 14853 USA Department of NanoEngineering University of California San Diego La Jolla CA 92093 USA Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh PA 15213 USA Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA Cornell High Energy Synchrotron Source Cornell University Ithaca NY 14853 USA

Sodium-Ion Batteries In article number 2103521, Jason J. Huang and co-workers use operando single particle X-ray diffraction to probe disorder dynamics in individual cathode particles of Nax[Ni1/3Mn2/3]O2, an archetypal cathode material for sodium-ion batteries. The high throughput technique reveals the role of order-disorder transitions in the detrimental P2-O2 structural phase transition. These findings serve to guide the design of sodium-ion battery cathodes with a longer cycle life.

关键词： batteries diffraction operando single-particles sodium-ions

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An Electrochemical Study of Phthalate Esters – Potential Low-Cost, Nonvolatile, and Oxidatively-Stable Electrolyte Components

SSRN

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SSRN 2023年

作者： Zhao, Yineng Tenhaeff, Wyatt E. Materials Science Program University of Rochester RochesterNY14627 United States Department of Chemical Engineering University of Rochester RochesterNY14627 United States

Electrolytes with low volatility/flammability and high oxidative stability are desirable for safe high-voltage energy storage. Phthalate esters are a class of organic molecules that are low cost, nonvolatile, and much less flammable than commercial liquid electrolytes. They have long been used as plasticizers in polymers and recently were shown to enhance the performance of nitrile-bearing polymer electrolytes, but little is known about their electrochemical properties relevant to energy storage applications. In this work, the thermal and electrochemical stability of phthalate esters employed as liquid electrolyte solvent were comprehensively investigated. Their ionic conductivity and electrochemical stability were reported for the first time. The conductivity of 1M LiTFSI in dimethyl-phthalate (DMP) was 2.1×10-4 S/cm at 25°C and 1.1×10-3 S/cm at 60°C. Significant evaporation was not observed until 147°C in an open environment. The DMP/LiTFSI electrolyte was stable up to 4.8 V vs. Li/Li+, outperforming state-of-the-art liquid electrolytes based on organic carbonates. Such properties are desirable for phthalates as plasticizers in high-voltage polymer/liquid electrolytes. However, it was demonstrated that the phthalates do not form passivating interfacial reaction layers with lithium metal anodes, making them incompatible with unprotected Li metal anodes. © 2023, The Authors. All rights reserved.

关键词： Plasticizers

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Correlations between water quality and precipitation in areas with different levels of human occupation

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International Journal of Energy and Water Resources 2021年第1期5卷 25-31页

作者： Rodrigues, Lucas Augusto Pereira Radomski, Fernando Aparecido Dias Godoy, Rodrigo Felipe Bedim Trevisan, Elias Crisigiovanni, Enzo Luigi Department of Environment State University of Maringá Maringá-PR Brazil Graduate Program in Materials Science and Engineering Federal University of Paraná Curitiba-PR Brazil Graduate Program in Forest Sciences Unicentro Guarapuava-PR Brazil

Riverine water is largely used for human consumption and it is well known that its quality is correlated to many external factors. Because of that, this study evaluated linear correlations between precipitation and several water quality parameters using data collected from Antas’ river (Paraná, Brazil) at locations with different levels of human occupation aiming to identify water quality irregularities related to these important external factors, especially at a point surrounded by preserved vegetation. The statistical analyses were made using Pearson’s linear correlation coefficient (r) and the open source programming software, R. The results showed that precipitation has moderate to strong correlation with turbidity, true color, total coliforms and E. coli (0.99 ≥ r ≥ 0.44), and also has weak to moderate correlations with pH (− 0.39 ≥ r ≥ − 0.58) and biochemical oxygen demand (0.48 ≥ r ≥ 0.36), regardless of the level of human occupation nearby. The high correlations observed for E. coli and total coliforms in an area protected by native vegetation, probably due to adjacent rural activities, represents a novel and major finding. Dissolved oxygen and temperature showed no significant correlations with rainfall volume (0.26 ≥ r ≥ − 0.19). Since Brazilian law ensures that water quality parameters must be measured and considered in projects of water resources management, the proposed methodology seems to be promising for government policies applications, since it comprises only simple analyzes and a free software for simulations. © Islamic Azad University (IAU) 2021.

关键词： Hydrology R software Rainfall Spatial data Statistical analysis

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