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Terahertz characterization of nano-scale high-entropy alloy films and their high-contrast grating applications

AIP Advances 2024年第3期14卷

作者： Lu, Chia-Yen Sung, Yi-Chen Yeh, Cheng-Hsien Chen, Yu-Hua Kuan, Chen-Yun Hung, Kuang-Teng Chen, Wei-Hsiang Hsu, Wen-Dung Shih, Chuan-Feng Yang, Chan-Shan Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei11677 Taiwan Department of Electrical Engineering National Cheng Kung University Tainan70101 Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Center National Cheng Kung University Tainan70101 Taiwan Micro/Nano Device Inspection and Research Center National Taiwan Normal University Taipei10610 Taiwan Ministry of Education Taipei106335 Taiwan

We investigated the optical constants of thin films of the Nb25Mo25Ta25W25 alloy, which belongs to high-entropy alloys (HEAs), with a transmission terahertz (THz) measurement system and discovered that the refractive index, extinction coefficient, and conductivity of the HEA thin film measured in the range of 0.3-1.0 THz all increased as the thickness of the thin film increased (the thickness was maintained in the range between 10 and 40 nm). According to the experimental results, this alloy with a high refractive index is suitable for producing high-contrast gratings (HCGs). The principle behind achieving a high contrast with a high-reflection HEA grating is to harness the confined plasmonic energy within the grating, thereby enhancing the localized plasmonic energy within the grating. This work elucidates that we can not only fabricate THz components by controlling the thickness of the thin film but also utilize the high refractive index of this material to create HCGs. © 2024 Author(s).

关键词： Refractive index

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A Review of Carbon dots (CDs) Application in Sensing and Removing Medical Waste 5

A Review of Carbon dots (CDs) Application in Sensing and Rem...

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5th International Conference on Energy, Environmental and Information System, ICENIS 2020

作者： Alkian, Ilham Sutanto, Heri Aprimanti Utami, Bella Rafika Duri, Inten A'Yuni, Dewi Qurrota Hadiyanto, H Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Physics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Smart Materials Research Center Diponegoro University Semarang Indonesia

Carbon dots materials (CDs) have the capability in the management of medical waste problem because of its advantage in the detection and degradation of pollutants. The synthesized CDs through various processes and raw materials have been applied to medical wastes, especially antibiotics such as tetracycline (TC), amoxicillin (AMX), para-Nitrophenol (p-NP), doxycycline (DC), ciprofloxacin (CIP), and oxytetracycline (OTC). These antibiotics are detected by utilizing changes in the luminescence property of CDs from the turn-off and turn-on mechanisms. Afterward, the degradation process is conducted using CDs as support materials agent semiconductors in the photosynthesis scheme. In general, CDs can be referred to as multifunction smart materials with the ability to detecting the presence of the antibiotics in simple, sensitive, and selective ways, and potency of medical pollutant removal clearly and effectively. © The Authors, published by EDP sciences, 2020.

关键词： Antibiotics

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Effect of Different Manufacturing Methods on Polyamide Reverse-Osmosis Membranes for Desalination: Insights from Molecular Dynamics Simulations

SSRN

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SSRN 2022年

作者： He, Jinlong McCutcheon, Jeffrey R. Li, Ying Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Department of Chemical & Biomolecular Engineering Center for Environmental Sciences and Engineering University of Connecticut StorrsCT06269 United States Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States

The industry-leading polyamide (PA) reverse osmosis (RO) membranes can be manufactured via molecular layer-by-layer (mLBL) deposition, interfacial polymerization (IP), and 3D-printing technique. However, the influence of different manufacturing methods on PA membrane’s properties is far from understood. In this study, we present the high-pressure transport behavior of water and salt ions for PA membranes formed with IP, mLBL, and 3D-printing through non-equilibrium molecular dynamics simulations. studies show that membranes fabricated with 3D-printing have similar performances to those manufactured using mLBL, quantified by water permeability, rejection of salt ions, structural integrity, and porosity features. However, the membranes formed with IP exhibit faster water transport, lower rejection, worse structural integrity, and more inhomogeneous network pores than those constructed using mLBL and 3D-printing. The unconnected water-accessible space governs water transport for PA membranes formed with mLBL and 3D-printing, which offers the impermanent open-closed pores that enable water to jump through PA membranes. In contrast, the permeated water-enterable space plays a prominent role in water movement across the PA membrane formed with IP, providing a continuous transport channel at high pressure. Importantly, we observe the more significant compaction features at high pressure for PA membranes formed with IP than mLBL and 3D-printing. © 2022, The Authors. All rights reserved.

关键词： Polymerization

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Correction: Polyaniline nanorods dotted on graphene oxide nanosheets as a novel super adsorbent for Cr(VI)

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Dalton transactions (Cambridge, England : 2003) 2022年第1期52卷 2022 Dec 8页

作者： Shouwei Zhang Meiyi Zeng Wenqing Xu Jiaxing Li Jie Li Jinzhang Xu Xiangke Wang Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma Physics Chinese Academy of Sciences 230031 Hefei PR China. lijx@***. School of Materials Science and Engineering Hefei University of Technology Hefei 230031 China. Department of Chemical Engineering Environmental Engineering Program Yale University New Haven Connecticut 06520 USA.

Correction for 'Polyaniline nanorods dotted on graphene oxide nanosheets as a novel super adsorbent for Cr(VI)' by Shouwei Zhang , , 2013, , 7854-7858, https://***/10.1039/C3DT50149C.

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Large Negative Magnetoresistance in off-Stochiometric Topological Material PrSbTe

arXiv

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arXiv 2025年

作者： Acharya, Gokul Pandey, Krishna Sharma, M.M. Wang, Jian Chhetri, Santosh Karki Nabi, Md Rafique Un Upreti, Dinesh Basnet, Rabindra Sakon, Josh Hu, Jin Department of Physics University of Arkansas FayettevilleAR United States Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR United States Department of Chemistry and Biochemistry Wichita State University WichitaKS United States Department of Chemistry & Physics University of Arkansas at Pine Bluff Pine BluffAR71603 United States Department of Chemistry and Biochemistry University of Arkansas FayettevilleAR72701 United States

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 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. © 2025, CC BY-NC-ND.

关键词： Magnetoresistance

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Study of the reduction of Fe on reduced graphene oxide as a catalyst for carbon monoxide reduction 2nd

Study of the reduction of Fe on reduced graphene oxide as a ...

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2nd International Conference on materials science and engineering: Recent Advances and Challenges, ICMSE-RAC 2019

作者： Elnaggar, Hamada A. Nasser, Al-Hassan M. Basha, Islam K. Elbery, Haitham M. EL-Moneim, Ahmed. A. Materials Science and Engineering Department Egypt-Japan University of Science and Technology New Borg El-Arab Alexandria21934 Egypt Materials Sciences Department Institute of Graduate Studies and Research Alexandria University Alexandria Egypt

ISBN: (纸本)9783035715347

This work aims at optimizing the H2 reduction time of Fe/rGO as a preparatory step for the use of the reduced catalyst in Fisher-Tropsch synthesis (FTS). The catalytic system used was iron nanoparticles (NPs) loaded on reduced graphene oxide (rGO) support. The as prepared sample was analyzed by TEM, FTIR and XRD spectroscopy. Samples of the produced Fe/rGO catalyst were used to optimize the reduction conditions in the FBR reactor. The three samples were reduced under 1atm H2 gas flow of 50 sccm at 500°C for 8, 12 and 24 hrs. The samples were collected after reduction and analyzed by XRD, FTIR and TEM imaging. The best condition showing full reduction with minimal sintering was at 12hr. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Graphene

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Van der Waals device integration beyond the limits of van der Waals forces via adhesive matrix transfer

arXiv

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arXiv 2023年

作者： Satterthwaite, Peter F. Zhu, Weikun Jastrzebska-Perfect, Patricia Tang, Melbourne Gao, Hongze Kitadai, Hikari Lu, Ang-Yu Tan, Qishuo Tang, Shin-Yi Chueh, Yu-Lun Kuo, Chia-Nung Lue, Chin Shan Kong, Jing Ling, Xi Niroui, Farnaz Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Chemical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Chemistry Boston University BostonMA02215 United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei11492 Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Cheng Kung University Tainan70101 Taiwan Taiwan Consortium of Emergent Crystalline Materials National Science and Technology Council Taipei10601 Taiwan Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Division of Materials Science and Engineering Boston University BostonMA02215 United States The Photonics Center Boston University BostonMA02215 United States

Pristine van der Waals (vdW) interfaces between two-dimensional (2D) and other materials are core to emerging optical and electronic devices. Their direct fabrication is, however, challenged as the vdW forces are weak and cannot be tuned to accommodate integration of arbitrary layers without solvents, sacrificial-layers or high-temperatures, steps that can introduce damage. To address these limitations, we introduce a single-step 2D material-to-device integration approach in which forces promoting transfer are decoupled from the vdW forces at the interface of interest. We use this adhesive matrix transfer to demonstrate conventionally-forbidden direct integration of diverse 2D materials (MoS2, WSe2, PtS2, GaS) with dielectrics (SiO2, Al2O3), and scalable, aligned heterostructure formation, both foundational to device development. We then demonstrate a single-step integration of monolayer-MoS2 into arrays of transistors. With no exposure to polymers or solvents, clean interfaces and pristine surfaces are preserved, which can be further engineered to demonstrate both n- and p-type behavior. Beyond serving as a platform to probe the intrinsic properties of sensitive nanomaterials without the influence of processing steps, our technique allows efficient formation of unconventional device form-factors, with an example of flexible transistors demonstrated. Copyright © 2023, The Authors. All rights reserved.

关键词： Van der Waals forces

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Participatory Design and Early Deployment of DarumaTO-3 Social Robot 14th

Participatory Design and Early Deployment of DarumaTO-3 So...

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14th International Conference on Social Robotics, ICSR 2022

作者： Shen, Zhihao Urano, Nanaka Chen, Chih-Pu Feng, Shi Mitchell, Scean Katagiri, Masao Du, Yegang Trevejo, Franco Pariasca Tomo, Tito P. Schmitz, Alexander Browne, Ryan Ogawa, Toshimi Taki, Yasuyuki Trovato, Gabriele Future Robotics Organization Waseda University Tokyo Japan School of International Liberal Studies Waseda University Tokyo Japan Graduate School of Science and Engineering Waseda University Tokyo Japan Pontifical Catholic University of Peru Lima Peru Smart Aging Research Center Tohoku University Miyagi Sendai Japan Innovative Global Program Shibaura Institute of Technology Tokyo Japan

ISBN: (纸本)9783031246692

With the problem of ageing population increasingly prominent, the burden of families, caregivers and medical workers to take care of older adults will be heavier. Social exclusion and cognitive dysfunctions make things worse, especially in times of a pandemic. One of the most effective approaches to solve these problems can be technology, which application is often limited by the acceptance of the end user. We introduce a social robot, DarumaTO-3, whose appearance is inspired by a traditional Buddhist and Shinto doll called Daruma, and perform a preliminary test in which we hear the response from older adults. This paper describes this new robot prototype, and reports the feedback received from the early deployment with 44 Japanese older adults. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Machine design

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H2o2-Free Catalytic Dye Degradation at Dye/Night Circumstances Using Cus@Au Heterostructures Decorating on Mos2 Nanoflowers

SSRN

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SSRN 2024年

作者： Hsiao, Po-Hsuan Lee, Yu-Shen Lin, Kuan-Han Liao, Pin-Chao Juan, Joon Ching Chen, Chia-Yun Department of Materials Science and Engineering National Cheng-Kung University Tainan701 Taiwan Program on Semiconductor Packaging and Testing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Nanotechnology & Catalysis Research Centre Institute for Advanced Studies University of Malaya Kuala Lumpur50603 Malaysia Research Center National Cheng Kung University No.1 University Road Tainan701 Taiwan

Catalytic remediation of industrial organic pollutants is considered the effective mitigation of increasing risks from aqueous contaminations composed of hazardous substances. The seek for in-situ environmental remediation is highly demanded to deal with organic contaminations from on-site, instant and fulltime treatment without the need of removing the contaminated sources for ex-situ remediation is highly demanded. In this work, by means of combining the strategies of daytime and dark degradation capabilities of organic dyes, the MoS2/Au@CuS hybrid catalysts resembling semiconductor/metal/semiconductor junction features underline the generation of hydroxyl radicals, and force to speed up the oxidative removal of organic dyes during light-on and light-off conditions in both scenarios. We reveal that such circumstance exists when programming the environment in the sequence of light-on/light-off condition, which actively click the generation of H2O2 and strategically accelerate the degradation kinetics, offering an additional opportunity for promoting catalytic degradation of hazardous organic dyes with whole day feasibility. © 2024, The Authors. All rights reserved.

关键词： Degradation

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Cascaded forward Brillouin lasing in a chalcogenide whispering gallery mode microresonator

arXiv

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arXiv 2022年

作者： Shanavas, Thariq Grayson, Michael Xu, Bo Zohrabi, Mo Park, Wounjhang Gopinath, Juliet T. Department of Physics University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering University of Colorado BoulderCO80309 United States Materials Science Engineering Program University of Colorado BoulderCO80309 United States

We report the first observation of cascaded forward stimulated Brillouin scattering in a microresonator platform. We have demonstrated 25 orders of intramodal Stokes beams separated by a Brillouin shift of 34.5 MHz at a sub-milliwatt threshold at 1550 nm. An As2S3 microsphere of diameter 125 µm with quality factor 1×106 was used for this demonstration. Theoretical modeling is used to support our experimental observations of Brillouin shift and threshold power. We expect our work will advance the field of forward stimulated Brillouin scattering in integrated photonics with applications in gas sensing and photonic radio frequency sources. Copyright © 2022, The Authors. All rights reserved.

关键词： Microresonators

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