检索结果-内蒙古大学图书馆

Infrared Nanoimaging of Hydrogenated Perovskite Nickelate Synaptic Devices

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Gamage, Sampath Manna, Sukriti Zajac, Marc Hancock, Steven Wang, Qi Singh, Sarabpreet Ghafariasl, Mahdi Yao, Kun Tiwald, Tom Park, Tae Joon Landau, David P. Wen, Haidan Sankaranarayanan, Subramanian Darancet, Pierre Ramanathan, Shriram Abate, Yohannes Department of Physics and Astronomy University of Georgia AthensGA30602 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States Department of Mechanical and Industrial Engineering University of Illinois ChicagoIL60607 United States Advanced Photon Source Argonne National Laboratory LemontIL60439 United States Center for Simulational Physics Department of Physics and Astronomy University of Georgia AthensGA30602 United States School of Materials Engineering Purdue University West LafayetteIN47907 United States School of Electrical and Computer Engineering University of Georgia AthensGA30602 United States J.A. Woollam Co. Inc. LincolnNE68508 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Northwestern Argonne Institute of Science and Engineering EvanstonIL60208 United States Department of Electrical & Computer Engineering Rutgers The State University of New Jersey PiscatawayNJ08854 United States

Solid-state devices made from correlated oxides such as perovskite nickelates are promising for neuromorphic computing by mimicking biological synaptic function. However, comprehending dopant action at the nanoscale poses a formidable challenge to understanding the elementary mechanisms involved. Here, we perform operando infrared nanoimaging of hydrogen-doped correlated perovskite, neodymium nickel oxide (H-NdNiO3) devices and reveal how an applied field perturbs dopant distribution at the nanoscale. This perturbation leads to stripe phases of varying conductivity perpendicular to the applied field, which define the macroscale electrical characteristics of the devices. Hyperspectral nano-FTIR imaging in conjunction with density functional theory calculations unveil a real-space map of multiple vibrational states of H-NNO associated with OH stretching modes and their dependence on the dopant concentration. Moreover, the localization of excess charges induces an out-of-plane lattice expansion in NNO which was confirmed by in-situ - x-ray diffraction and creates a strain that acts as a barrier against further diffusion. Our results and the techniques presented here hold great potential to the rapidly growing field of memristors and neuromorphic devices wherein nanoscale ion motion is fundamentally responsible for function. © 2023, CC BY.

关键词： Perovskite

Theoretical insights into the chemical bonding, electronic structure, and spectroscopic properties of the lanarkite Pb2SO5 structure

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Fabris, Guilherme S.L. Ferrer, Mateus M. Sambrano, Julio R. Almeida, Cláudio R.R. Paskocimas, Carlos A. La Porta, Felipe A. Graduate Program in Materials Science and Engineering Technological Development Center Universidade Federal de Pelotas RS Pelotas96010-610 Brazil Modeling and Molecular Simulation Group São Paulo State University Bauru São Paulo17033-360 Brazil Department of Materials Engineering Federal University of Rio Grande do Norte RN Natal59078-970 Brazil Postgraduate Program in Science and Engineering of Materials Federal University of Rio Grande do Norte RN Natal59078-970 Brazil Federal University of Technology - Paraná Nanotechnology and Computational Chemistry Laboratory Avenida dos Pioneiros 3131 CEP PR Londrina86036-370 Brazil State University of Londrina Post-Graduation Program in Chemistry Rodovia Celso Garcia Cid 445 km 380 CEP PR Londrina86057-970 Brazil

Lanarkite is a mineral formed by a combination of lead, sulphur, and oxygen atoms arranged in the general chemical formula Pb2SO5 (PSO) that crystallises with monoclinic symmetry (belonging to the C2/m space group, No. 12). This mineral was first discovered in Lanarkshire, Scotland and was named after its location. PSO has a unique structure comprising alternating penta-coordinated lead [PbO5] and tetra-coordinated sulphur [SO4] clusters. This lanarkite-type structure has recently attracted significant scientific interest and has been the focus of the superconducting material research community. However, its chemistry needs to be explored further. This article presents a comprehensive investigation on the chemical bonding, electronic structure, and spectroscopic properties of the lanarkite-type PSO structure from a computational perspective. Thus, different functionals in the DFT (e.g., PBE, PBE0, PBESOL, PBESOL0, BLYP, WC1LYP37, and B3LYP) were assessed to accurately predict their fundamental properties. All the DFT calculations were performed using a triple-zeta valence plus polarisation basis set. Among all the DFT functionals tested in this study, PBE showed the best agreement with the experimental data available in the literature. Our results also reveal that the [PbO5] clusters are formed with three Pb–O bond lengths, with values of about 2.32, 2.59, and 2.84 Å, respectively, while the [SO4] clusters have the same S–O bond length of 1.57 Å. We performed a complete topological analysis of this system to comprehend these structural differences. Additionally, the PSO structure has an indirect band gap energy of 2.9 eV and an effective mass ratio (mℎ∗ /me∗) of about 0.415 (using PBE calculations) which may, in principle, indicate a low recombination of electron-hole pairs in the lanarkite structure. Therefore, we believe that a detailed understanding of their electronic structures, spectroscopic properties as well as their chemical bonding is critically important

关键词： Lead compounds

Amplification of enzymatic and microbial fuel cells using organic electrochemical transistors

学校读者我要写书评

暂无评论

Device

Device 2025年

作者： Saxena, Ravindra Zhang, Xu Cai, Rong Suggs, Olivia Bruggeman, Chase Hickey, David P. Ajo-Franklin, Caroline M. Verduzco, Rafael Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston 77005 TX United States Department of Biosciences Rice University Houston 77005 TX United States Department of Chemical Engineering and Materials Science Michigan State University East Lansing 48824 MI United States Department of Bioengineering Rice University Houston 77005 TX United States Department of Chemical and Biomolecular Engineering Rice University Houston 77005 TX United States Rice Advanced Materials Institute Rice University Houston 77005 TX United States

Organic electrochemical transistors (OECTs) are thin-film devices operated in aqueous and biological environments for sensing chemicals and biomolecules. However, most sensor configurations involve introducing the target biomolecule directly in the OECT device. This has drawbacks because it may not be possible to have an electrolyte compatible with the target biomolecule or an environment optimal for the OECT. Here, we demonstrate a general and modular approach to building electrochemical sensors by coupling OECTs electronically with either an enzymatic fuel cell (EFC) or microbial fuel cell (MFC). We demonstrate that this modular approach can amplify currents by three orders of magnitude and enhance the signal-to-noise ratio. We also show that the power generated by the fuel cell can help tune the sensor's response for different applications. This work demonstrates a simple and versatile approach for amplifying currents from MFCs and EFCs useful for the development of bioelectronic sensors. © 2025 The Authors

关键词： amplification biosensors DTI-3: Develop electro-active bacteria enzymatic fuel cells microbial fuel cells organic electrochemical transistors power

Signatures of a topological phase transition in a planar Josephson junction

学校读者我要写书评

暂无评论

Physical Review B 2023年第24期107卷 245304-245304页

作者： A. Banerjee O. Lesser M. A. Rahman H.-R. Wang M.-R. Li A. Kringhøj A. M. Whiticar A. C. C. Drachmann C. Thomas T. Wang M. J. Manfra E. Berg Y. Oreg Ady Stern C. M. Marcus Center for Quantum Devices Niels Bohr Institute University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark Department of Condensed Matter Physics Weizmann Institute of Science Rehovot 76100 Israel Department of Physics Tsinghua University Beijing 100084 China Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA Birck Nanotechnology Center Purdue University West Lafayette Indiana 47907 USA School of Materials Engineering Purdue University West Lafayette Indiana 47907 USA School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA

A growing body of work suggests that planar Josephson junctions fabricated using superconducting hybrid materials provide a highly controllable route toward one-dimensional topological superconductivity. Among the experimental controls are the in-plane magnetic field, phase difference across the junction, and carrier density set by electrostatic gate voltages. Here, we investigate wide planar Josephson junctions based on an epitaxial InAs/Al heterostructure, embedded in a superconducting loop, probed with integrated quantum point contacts (QPCs) at both ends of the junction. For a large range of gate voltages, a closing and reopening of the superconducting gap is observed that appears strongly correlated at the two ends of the junction. The reopening occurred roughly at in-plane magnetic field B∥≃0.2T, was uniform across multiple devices, and tunable with phase bias. A narrower range of the junction gate voltage, covering roughly 10% of the operable gate space, supports a zero-bias conductance peak (ZBCP) that appears upon reopening of the gap. However, the height, shape, and even presence of ZBCPs typically differed between the ends, suggesting a weak end-to-end correlation. Theoretical modeling suggests an orbital-effect driven mechanism for the gap-reopening. Within this model, the gap reopening represents a topological phase transition when associated with a zero-energy state. While several features of the experimental data are captured by our model, the lack of end-to-end correlation of ZBCPs in the experiment suggests the absence of an uninterrupted topological phase along the junction, presumably due to disorder. Deliberately tuned local end dots show distinctly different phenomenology, particularly with respect to phase bias, providing a check on possible topological and nontopological interpretations.

关键词： Andreev reflection Majorana fermions Topological superconductors Josephson junctions

A critical perspective for emerging ultra-thin solar cells with ultra-high power-per-weight outputs

学校读者我要写书评

暂无评论

arXiv 2023年

作者： Panagiotopoulos, Apostolos Maksudov, Temur Kakavelakis, George Perrakis, George Alharbi, Essa A. Kutsarov, Dimitar Isikgor, Furkan H. Alfihed, Salman Petridis, Konstantinos Kafesaki, Maria Silva, S.P. Ravi Anthopoulos, Thomas D. Graetzel, Michael Department of Electrical and Electronic Engineering University of Surrey Guildford SurreyGU2 7XH United Kingdom Thuwal23955-6900 Saudi Arabia Laboratory of Photonics and Interfaces Institute of Chemical Sciences and Engineering Ecole Polytechnique Federal de Lausanne Lausanne1015 Switzerland Department of Electronic Engineering School of Engineering Hellenic Mediterranean University Romanou 3 Chalepa Chania CreteGR-73100 Greece Crete Heraklion70013 Greece Riyadh11442 Saudi Arabia Department of Materials Science and Technology University of Crete Crete Heraklion70013 Greece

Ultrathin, solution-processed emerging solar cells with high power-per-weight (PPW) outputs demonstrate unique potential for applications where low weight, high power output, and flexibility are indispensable. The following perspective explores the literature of emerging PVs and highlights the maximum reported PPW values of Perovskite Solar Cells (PSCs) 29.4 W/g, Organic Solar Cells (OSCs) 32.07 W/g and Quantum Dot Solar Cells (QDSC) 15.02 W/g, respectively. The record PPW values of OSCs and PSCs are approximately one order of magnitude higher compared to their inorganic ultrathin solar cells counterparts (approx. 3.2 W/g for CIGS and a-Si). This consists emerging PVs, very attractive for a variety of applications where the PPW is the key parameter. In particular, both OSCs and PSCs can be implemented in different scenarios of applications (indoor and biocompatible applications for OSCs and outdoor and high-energy radiation conversion conditions for the PSCs) due to their unique optoelectronic and physiochemical properties. Finally, our theoretical optical and electrical simulation and optimization study for the most promising and well-suited PV technologies, showed an impressive maximum realistic theoretical PPW limit of 74.3 and 93.7 W/g for PSCs and OSCs, respectively. Our finding shows that the literature PSCs and OSCs towards high PPW outputs, is not quite close to the theoretical maximum and thus more work needs to be done to further increase the PPW output of these promising PV technologies. © 2023, CC BY.

关键词： Organic solar cells

Asymmetrical contact scaling and measurements in MoS2FETs

学校读者我要写书评

暂无评论

arXiv 2022年

作者： Cheng, Zhihui Backman, Jonathan Zhang, Huairuo Abuzaid, Hattan Li, Guoqing Yu, Yifei Cao, Linyou Davydov, Albert V. Luisier, Mathieu Richter, Curt A. Franklin, Aaron D. Duke University Department of Electrical & Computer Engineering DurhamNC27708 United States National Institute of Standards and Technology Nanoscale Device Characterization Division GaithersburgMD20899 United States Purdue University Department of Electrical & Computer Engineering West LafayetteIN47907 United States Eth Zurich Integrated Systems Laboratory ZurichCH-8092 Switzerland National Institute of Standards and Technology Materials Science and Engineering Division GaithersburgMD20899 United States North Carolina State University Department of Materials Science and Engineering RaleighNC27695 United States Duke University Department of Chemistry DurhamNC27708 United States

Two-dimensional (2D) materials have great potential for use in future electronics due to their atomically thin nature which withstands short channel effects and thus enables better scalability. Device scaling is the process of reducing all device dimensions to achieve higher device density in a certain chip area. For 2D materials-based transistors, both the channel and contact scalability must be investigated. The channel scalability of 2D materials has been thoroughly investigated, confirming their resilience to short-channel effects. However, systematic studies on contact scalability remain rare and the current understanding of contact scaling in 2D FET is inconsistent and oversimplified. Here we combine physically scaled contacts and asymmetrical contact measurements to investigate the contact scaling behavior in 2D field-effect transistors (FETs). The asymmetrical contact measurements directly compare electron injection with different contact lengths while using the exact same channel, eliminating channel-to-channel variations. Compared to devices with long contact lengths, devices with short contact lengths (scaled contacts) exhibit larger variation, smaller drain currents at high drain-source voltages, and a higher chance of showing early saturation and negative differential resistance. Quantum transport simulations show that the transfer length of Ni-MoS2contacts can be as short as 5 nm. Our results suggest that charge injection at the source contact is different from injection at the drain side: scaled source contacts can limit the drain current, whereas scaled drain contacts cannot. Furthermore, we clearly identified that the transfer length depends on the quality of the metal-2D interface. The asymmetrical contact measurements proposed here will enable further understanding of contact scaling behavior at various interfaces. © 2022, CC BY.

关键词： Scalability

Enhancing UAV Spraying Efficiency through Payload Sensor Integration

学校读者我要写书评

暂无评论

Enhancing UAV Spraying Efficiency through Payload Sensor Int...

IEEE Latin American Robotics Symposium, LARS

作者： Celso O. Barcelos Leonardo A. Fagundes-Júnior Daniel C. Gandolfo Martin Saska Alexandre S. Brandão Department of Electrical Engineering Graduate Program in Computer Science Núcleo de Especialização em Robótica (NERo) Universidade Federal de Viçosa Viçosa MG Brazil Instituto de Automática National University of San Juan San Juan Argentine Department of Cybernetics Czech Technical University in Prague Prague Czech Republic

ISBN: (数字)9798331508807

ISBN: (纸本)9798331508814

The use of UAVs has grown in recent years, leading to the prominence of various applications such as monitoring and inspection, search and rescue operations, dam and civil structure inspection, military applications, among others. One of the most relevant applications today is related to Precision Agriculture, which is the subject of this work. Our study analyzes the behavior of an Unmanned Autonomous Vehicle (UAV) used for spraying tasks. The variation of the payload is measured through a load sensor. This information indicates to the UAV the right time to return to the base for refueling or completion of the application. Experimental validation is carried out to assess the functionality of the payload sensor during flight operations. In addition, the dynamic compensation controller improves the navigation of the UAV, even in the presence of payload variations during the entire mission duration.

关键词： Precision agriculture Navigation Spraying Inspection Robot sensing systems Autonomous aerial vehicles Vehicle dynamics Monitoring Payloads Diseases

Liquid Metal Based Triboelectric Nanogenerator with Excellent Electrothermal and Safeguarding Performance Towards Intelligent Plaster

学校读者我要写书评

暂无评论

SSRN

SSRN 2022年

作者： Gong, Liping Xuan, Tingting Wang, Sheng Du, Haiping Li, Weihua School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Anhui Hefei230027 China School of Electrical Computer and Telecommunication Engineering University of Wollongong Wollongong2522 Australia

Polymer-based self-powered wearable sensing devices are easily destroyed under harsh mechanical shocks which largely restricts the development of smart electronic device. Herein, a versatile liquid metal based triboelectric nanogenerator (LM-TENG) device was developed by integrating the shear stiffening elastomer (SSE) with liquid metal (LM) and electrothermal aluminum foil. Based on the electrostatic induction effect, LM-TENG showed the good capacity of harvesting energy. The output voltage and power of the LM-TENG reached to 22.29 V and 55.16 µW with 9 MΩ load resistance at the force and frequency of 40 N and 15 Hz. Besides, LM-TENG demonstrated excellent electrothermal performance by efficiently reaching 69.02 °C with the applied voltage of 1.5 V. Additionally, LM-TENG displayed safeguarding performance under quasi-static and dynamic damage by effectively decreasing the impact force from 2.86 to 0.72 kN, endowing the device with excellent anti-impact from sharp objects penetration loading. Moreover, the utility of LM-TENG as intelligent medical plaster with joule-heating, controllable stiffness, self-powering sensing and anti-impact performance was further studied, providing a new strategy for designing multifunctional sensor, and paving the way for intelligent wearable electronics, personal healthcare and safeguards in the future. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

Infinite-Q guided modes radiate in the continuum

学校读者我要写书评

暂无评论

Physical Review B 2023年第11期107卷 115415-115415页

作者： Kaili Sun Heng Wei Weijin Chen Yang Chen Yangjian Cai Cheng-Wei Qiu Zhanghua Han Shandong Provincial Key Laboratory of Optics and Photonic Devices Center of Light Manipulation and Applications School of Physics and Electronics Shandong Normal University Jinan 250358 China Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore 117583 Chinese Academy of Sciences Key Laboratory of Mechanical Behavior and Design of Materials Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei China

Guided modes in photonic structures, with broadband infinite-quality factors, are inaccessible from the far field due to the momentum mismatch. They become leaky modes in the continuum when the mismatch is compensated for by introducing periodic perturbations to form photonic structures. However, the quality factors (Q factors) of such leaky modes deteriorate significantly in most regions of the k-space except at a few discrete high-symmetry points. It is an intriguing question as to whether guided modes can hop above the light cone and yet maintain high Q. Here, we propose a double-band-folding strategy to achieve high-Q leaky modes in compound lattices, exemplified with a one-dimensional grating and a two-dimensional zigzag array of dielectric disks. The Q factor of those leaky modes can be made ultrahigh at arbitrarily any incident angles, showing that such modes do not originate from bound states in the continuum (BICs) above the light cone. Our findings provide unique insight for elucidating the relations between guided modes, BICs, quasi-BICs, and radiation. They further provide a generalized recipe for numerous optical applications such as all-dielectric sensing, lasing, and nonlinear generation with multiple inputs.

关键词： Light propagation, transmission & absorption Metasurfaces Nanophotonics Photonic crystals