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A low-cost and environmentally-friendly chitosan/spent coffee grounds composite with high photothermal properties for interfacial water evaporation

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Journal of Industrial and engineering Chemistry 2023年 126卷 283-291页

作者： Hsieh, Po-Cheng Chen, Yi-Chun Zheng, Nai-Ci Mangindaan, Dave Chien, Hsiu-Wen Department of Chemical and Materials Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Department of Forestry National Chung-Hsing University Taichung40227 Taiwan Professional Engineering Program Department Faculty of Engineering Bina Nusantara University Jakarta11480 Indonesia National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan

The present study explores the remarkable photothermal properties and potential applications exhibited by melanoidin-enriched spent coffee grounds (SCGs). However, the inherent challenge lies in the substantial particle size of SCGs, leading to rapid sedimentation within the medium and resulting in uneven heat distribution during photothermal analysis. To overcome this obstacle, acid hydrolysis was employed to liquefy the SCGs, allowing their dispersion in water and significantly enhancing their light absorption capacity. The photothermal properties of liquefied SCGs (LSCGs) were analyzed under 808-nm near-infrared (NIR) irradiation and compared with those of SCGs. Remarkably, the photothermal conversion efficiency of the LSCGs was as high as 52%, twice that of SCGs. To further explore their potential, the LSCGs were incorporated into chitosan (CS) to create homogenous and porous CS/LSCGs composites. These low-cost and environmentally friendly CS/LSCGs composites, made entirely from waste materials, demonstrated photothermal properties under NIR irradiation. Notably, they exhibited excellent performance in multiple cycles of water evaporation experiments, achieving an impressive water evaporation efficiency of nearly 90%. © 2023 The Korean Society of Industrial and engineering Chemistry

关键词： Lignocellulose

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Tunable magneto-Seebeck effect in Co_(2)FeSi/MgO/Co_(2)FeSi heterostructure via optimized interfacial engineering

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science China(physics,Mechanics & Astronomy) 2024年第3期67卷 128-135页

作者： Jingyu Li Xianbiao Shi Yurong Jin Le Ma Liuming Wei Chi Zhang Hang Li Peng-Fei Liu International Joint Research Laboratory of New Energy Materials and Devices of Henan Province School of Physics and ElectronicsHenan UniversityKaifeng 475004China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Defence Industry Secrecy Examination and Certification Center Beijing 100089China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Department of Network Security Henan Police CollegeZhengzhou 450046China College of Electrical Engineering Henan University of TechnologyZhengzhou 450001China

Enhancing the tunneling magneto-Seebeck(TMS) ratio and uncovering its underlying mechanism are greatly demanded in spin *** magnitude and sign of the TMS effect depend on the type of atom and the stacking order of atoms at the ***,we demonstrate that TMS ratios can be effectively manipulated by altering heterogonous or homogeneous interface through decoration on the CoFeSi(001) surface inserted on the MgO insulating *** maximum TMS ratio of pure Co_(2)/O termination is 4565% at 800 ***,the TMS ratio of the FeSi/O termination has two peak values,of which the maximum could reach up to-3290% at 650 *** comparing two different atom arrangements at the interface,we reveal that the sign and symbol of the TMS ratio can be controlled by the temperature and different atomic configurations at the Co_(2)FeSi/MgO ***,the spin-Seebeck coefficient up to ~150 μV/K is also possible when we select suitable terminations and *** findings will provide useful insights into how to control the sign and symbol of the TMS ratio and accordingly stimulate the development field of magneto-thermoelectric power and spin caloritronic devices based on the magneto-Seebeck effect in Heusler-based metallic multilayers.

关键词： magneto-Seebeck effect interface spintronics electronic structure spin-Seebeck effect

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Space-confined vapor deposited molecular ferroelectric film for photovoltaic devices

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Nano Research 2025年第3期18卷 611-618页

作者： Chen Wang Shan Cong Lingbo Xiao Chao-ran Huang Ruonan Wang Ruijie Li Lutao Li Guifu Zou Qiang Zhang College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China College of Energy Soochow Institute for Energy and Materials Innovationsand Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215000China Department of Applied Physics Zhejiang University of Science and TechnologyHangzhou 310023China School of Advanced Energy Sun Yat-sen UniversityShenzhen 518107China

Molecular ferroelectrics,characterized by outstanding photoelectric and unique ferroelectric properties,invigorate the field of ferroelectric ***,the performance of molecular ferroelectric devices is hindered by fine grains resulting from poor high-temperature *** this work,we successfully achieved micron-grained molecular ferroelectric films by using the space-confined vapor deposited *** optimized film exhibited a significant increase in grain size from the nanometer level(0.08μm)to the micrometer level(~2μm),leading to improved optoelectronic and ***,it optimizes the energy level and enhances the photovoltaic performance of vertical *** on the mechanism shows that high annealing temperature and inhibiting component loss play an important role in obtaining large grain *** work provides new research ideas for improving the quality of molecular ferroelectric films and provides valuable reference for the fabrication of high performance molecular ferroelectric photovoltaic devices.

关键词： molecular ferroelectric large grain space confinement photovoltaic devices

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Real-Time Tunable Gas Sensing Platform Based on SnO_(2) Nanoparticles Activated by Blue Micro-Light-Emitting Diodes

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Nano-Micro Letters 2024年第12期16卷 103-119页

作者： Gi Baek Nam Jung-El Ryu Tae Hoon Eom Seung Ju Kim Jun Min Suh Seungmin Lee Sungkyun Choi Cheon Woo Moon Seon Ju Park Soo Min Lee Byungsoo Kim Sung Hyuk Park Jin Wook Yang Sangjin Min Sohyeon Park Sung Hwan Cho Hyuk Jin Kim Sang Eon Jun Tae Hyung Lee Yeong Jae Kim Jae Young Kim Young Joon Hong Jong-In Shim Hyung-Gi Byun Yongjo Park Inkyu Park Sang-Wan Ryu Ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Research Laboratory of Electronics Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeMA 02139USA Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Display Materials Engineering Soonchunhyang UniversityAsan 31538Republic of Korea Department of Photonics and Nanoelectronics BK21 FOUR ERICA-ACE CenterHanyang University ERICAAnsan 15588Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Electronics Information and Communication EngineeringKangwon National UniversitySamcheok 25913Republic of Korea Advance Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Physics Chonnam National UniversityGwangju 500-757Republic of Korea

Micro-light-emitting diodes(μLEDs)have gained significant interest as an activation source for gas sensors owing to their advantages,including room temperature operation and low power ***,despite these benefits,challenges still exist such as a limited range of detectable gases and slow *** this study,we present a blueμLED-integrated light-activated gas sensor array based on SnO_(2)nanoparticles(NPs)that exhibit excellent sensitivity,tunable selectivity,and rapid detection with micro-watt level power *** optimal power forμLED is observed at the highest gas response,supported by finite-difference time-domain ***,we first report the visible light-activated selective detection of reducing gases using noble metal-decorated SnO_(2)*** noble metals induce catalytic interaction with reducing gases,clearly distinguishing NH3,H2,and ***-time gas monitoring based on a fully hardwareimplemented light-activated sensing array was demonstrated,opening up new avenues for advancements in light-activated electronic nose technologies.

关键词： Micro-LED Gas sensor array Low power consumption Metal decoration Real-time detection

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Control of Magnetic Skyrmions in an Exchange Biased van der Waals Ferromagnet

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1710-1711页

作者： McCray, Arthur R C Lebedev, Dmitry Arpaci, Sevdenur Te Velthuis, Suzanne G E Lopez-Dominguez, Victor Amiri, Pedram Khalili Hersam, Mark C. Petford-Long, Amanda K. Phatak, Charudatta Materials Science Division Argonne National Laboratory Lemont IL United States Applied Physics Program Northwestern University Evanston IL United States Department of Materials Science and Engineering Northwestern University Evanston IL United States Department of Electrical and Computer Engineering Northwestern University Evanston IL United States

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Rational design of Fe-N-C electrocatalysts for oxygen reduction reaction:From nanoparticles to single atoms

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Nano Research 2022年第3期15卷 1753-1778页

作者： Mengru Sun Changli Chen Menghao Wu Danni Zhou Zhiyi Sun Jianling Fan Wenxing Chen Yujing Li Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics and Engineering Technology Guilin Normal CollegeGuilin 541199China

As an alternative energy,hydrogen can be converted into electrical energy via direct electrochemical conversion in fuel *** important drawback of full cells is the sluggish oxygen reduction reaction(ORR)promoted by the high-loading of platinum-group-metal(PGM)***-N-C family has been received extensive attention because of its low cost,long service life and high oxygen reduction reaction activity in recent *** order to further enhance the ORR activity,the synthesis method,morphology regulation and catalytic mechanism of the active sites in Fe-N-C catalysts are *** paper reviews the research progress of Fe-N-C from nanoparticles to single *** structure-activity relationship and catalytic mechanism of the catalyst are studied and discussed,which provide a guidance for rational design of the catalyst,so as to promote the more reasonable design of Fe-N-C materials.

关键词： nanoparticle catalyst controlled structure regulation single atomic catalyst local atomic regulation synergistic effect

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Effect of Gd, V, and y Alloying on the Corrosion Properties of Fe-Mn-Ni-Al Fe-based Shape Memory Alloy

Effect of Gd, V, and y Alloying on the Corrosion Properties ...

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2023 Sharjah International Conference on physics of Advanced materials, SICPAM 2023

作者： Mustafa, Faisal Ahmad, Shahbaz Hassan, Arhum Egilmez, Mehmet El-Khatib, Sami Ibrahim, Taleb Department of Physics American University of Sharjah Sharjah26666 United Arab Emirates Materials Science and Engineering Program American University of Sharjah Sharjah26666 United Arab Emirates Department of Chemical Engineering American University of Sharjah Sharjah26666 United Arab Emirates

Shape Memory Alloys (SMA) are widely utilized in numerous industrial applications nowadays. Significant attention has been given to Fe-based SMA in civil engineering applications due to their high strength and reasonable cost. Researchers are striving to improve the corrosion resistance of these alloys so they can be utilized in marine environments. This article focuses on the effect of Gd, V, and Y alloying on FeMnNiAl based SMA. The phases and morphological effects were characterized using X-Ray diffractometer (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). To examine the corrosive nature of the Fe-based SMA system, a potentiodynamic analysis and electrochemical impedance spectroscopy (EIS) tests were performed in 3.5% NaCl solution. Results show that the addition of Gd rare earth metal has improved the overall corrosion efficiency of Fe-based SMAs by 48%. © Published under licence by IOP Publishing Ltd.

关键词： Scanning electron microscopy

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Annealing-induced oxidation state transition, crystal formation, optical properties, and photocatalytic activity of vanadium oxide nanoparticles

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Journal of Nanoparticle Research 2024年第5期26卷 1-11页

作者： Nhan, Doan Huu Cong, Huynh Ngoc Nha, Nguyen Ngoc Thanh Hai, Le Phuoc Toan, Nguyen Trong Cuong, Hoang Luong Kim, Sok Won Pham, Phuong V. Lu, Le T. Van Hieu, Le Le, Top Khac Faculty of Materials Science and Technology University of Science Ho Chi Minh City700000 Viet Nam Vietnam National University Ho Chi Minh City700000 Viet Nam Faculty of Physics and Engineering Physics University of Science Ho Chi Minh City700000 Viet Nam Laboratory of Multifunctional Materials University of Science VNU-HCM Ho Chi Minh City700000 Viet Nam Department of Semiconductor Physics and Engineering University of Ulsan Ulsan44610 Korea Republic of Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Hanoi Viet Nam

Vanadium has various oxidation states and multiple crystalline phases that make it interesting for various applications. The oxidation state transition and crystal formation of vanadium oxide (VOx) were affected by growth conditions and annealing temperatures. In this study, VOx nanopowders were prepared by hydrothermal method, and annealing-induced characterizations of VOx were analyzed. The morphologies, structures, composition, and optical properties of VOx were characterized by SEM, XRD, EDX, FTIR, and UV–Vis spectroscopy. The results demonstrated that the annealing temperature significantly affected the transition of oxide states from the VOOH and VOx clusters to V2O5 nanoparticles and the crystal size from amorphous to 38.96 nm which led to an increase in the optical band gap from 2.28, 2.26 to 2.39 and 2.38 eV as increasing calcination temperature and enhanced photocatalytic activity under sunlight irradiation. The energy dispersive X-ray (EDX) spectra reveal that the percentage molar mass between vanadium and oxygen changes due to the oxidation state transition and the formation of oxygen vacancies in V2O5. The relation between nanoparticle size, oxidation state, and crystal size was clarified by comparing EDX and XRD spectra. © The Author(s), under exclusive licence to Springer Nature B.V. 2024.

关键词： Optical properties

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Tunable unconventional integer quantum Hall effect in two-dimensional Dirac-Weyl systems

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Physical Review B 2024年第8期109卷 L081404-L081404页

作者： Y. J. Jin Y. Xu X. L. Xiao Z. J. Chen H. Xu Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics South China Normal University Guangzhou 510006 China Department of Physics & Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 People's Republic of China Institute of Micro/Nano Materials and Devices Ningbo University of Technology Ningbo 315016 Zhejiang People's Republic of China Department of Physics Chongqing University Chongqing 400044 People's Republic of China Songshan Lake Materials Laboratory Dongguan 523808 People's Republic of China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 People's Republic of China

Two-dimensional (2D) Dirac semimetals possess intriguing properties due to their low-energy excitations behaving like Dirac fermions. A hallmark of these materials is the unconventional integer quantum Hall effect (IQHE), originating from the quantized Berry phase of Dirac fermions. Herein, using symmetry analysis, tight-binding models, and numerical calculations, we reveal 2D Dirac-Weyl fermions in inversion symmetry breaking systems that exhibit tunable unconventional IQHE. These unique 2D fermions are characterized by a pair of helical edge states related by time-reversal symmetry T, which connect the projections of a Dirac point and two separate Weyl nodes, indicating that the Dirac and Weyl points are interconnected as a whole. We show that these 2D Dirac-Weyl fermions exhibit a tunable unconventional IQHE, featuring a Hall plateau sequence shifted by three units of 2e2h. The distance between adjacent quantized Hall plateaus can be adjusted by strain, which is a unique feature that distinguishes from what is observed in graphene. Through first-principles calculations, we identify an ideal candidate material for hosting 2D Dirac-Weyl fermions, offering a promising avenue for experimental verification. Our findings open up a door to exploring unconventional IQHE in condensed-matter systems beyond graphene.

关键词： Integer quantum Hall effect Landau levels Symmetry protected topological states Tight-binding model k dot p method

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Electric Control of Magnetism in Multiferroic Rare-Earth-Substituted BiFeO3 with Ferrielectricity

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Physical Review Letters 2024年第4期133卷 046801-046801页

作者： Shiji Xu Xin Wang L. Bellaiche Bin Xu Jiangsu Key Laboratory of Frontier Material Physics and Devices Institute of Theoretical and Applied Physics School of Physical Science and Technology Smart Ferroic Materials Center Physics Department and Institute for Nanoscience and Engineering Department of Materials Science and Engineering

The multiferroic rare-earth-substituted BiFeO3 has emerged as a promising candidate to achieve ultralow-energy-dissipation logic or memory devices, but the fundamental details of the switching mechanism involving the electrical, structural, and magnetic degrees of freedom is not fully understood, in particular, in its single-phase form. Here, a first-principles-based computational scheme is used to study Nd-doped BiFeO3 as a model system. The structure that yields a reduced P−E hysteresis loop is found to be ferrielectric with modulated octahedral tiltings, and it is shown that both the in-plane and out-of-plane ferromagnetization can be controlled by an applied electric field. The switching behaviors can be well interpreted by a Landau-type model, in which the magnetoelectric coupling is indirect and mediated by octahedral tiltings. The effects of varied composition and temperature are further discussed, revealing important correlations between the polarization switching and the robustness of the control of magnetization.

关键词： Ferroelectricity Magnetism Magnetoelectric effect Multiferroics Perovskites Monte Carlo methods

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