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

Nature Electronics 2024年第1期7卷 17-28页

作者： Satterthwaite, Peter F. Zhu, Weikun Jastrzebska-Perfect, Patricia Tang, Melbourne Spector, Sarah O. 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 CambridgeMA United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA United States Department of Chemical Engineering Massachusetts Institute of Technology CambridgeMA United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States Department of Chemistry Boston University BostonMA United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu Taiwan Department of Physics National Cheng Kung University Tainan Taiwan Taiwan Consortium of Emergent Crystalline Materials National Science and Technology Council Taipei Taiwan Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan Division of Materials Science and Engineering Boston University BostonMA United States The Photonics Center Boston University BostonMA United States

Pristine van der Waals (vdW) heterostructures formed between two-dimensional (2D) and other materials can be used to create optical and electronic devices. However, the weak vdW forces alone do not allow direct physical stacking of arbitrary layers. As a result, vdW heterostructure fabrication typically requires solvents, sacrificial layers or high temperatures, which can introduce damage and contaminants. Here, we show that adhesive matrix transfer can eliminate these limitations and can provide vdW integration beyond the limits of vdW forces. In the approach, a hybrid high- and low-adhesion surface is used to decouple the forces driving the transfer from the vdW forces defining the heterostructure of interest. We show that the technique can be used to achieve direct vdW integration of diverse 2D materials (MoS2, WSe2, PtS2 and GaS) with dielectrics (SiO2 and Al2O3), which is conventionally forbidden but critical for active devices and scalable, aligned heterostructure formation. The approach also allows single-step 2D material-to-device integration, which we illustrate by fabricating arrays of monolayer MoS2 transistors. As any exposure to solvents or polymers is avoided, the interfaces and surfaces remain pristine. Thus, intrinsic 2D material properties can be probed without the influence of processing steps. The materials can be further engineered through surface treatments and used to fabricate unconventional device form factors. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Van der Waals forces

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Optical properties of thin VO2-films at the phase transition: Design aspects for a fiber-optic thermometer

Optical properties of thin VO2-films at the phase transition...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： L. Hermano C. L. A. M. N. Lima L. A. L. Almeida C. L. Ferreira H. Neff Graduate Program in Electrical Engineering - PpgEE Department of Electrical Engineering Universidade Federal de Campina Grande Brazil Universidade Federal de Campina Grande Campina Grande PB BR Universidade Federal do ABC Santo Andre SP BR Department of Materials Science Instituto Militar de Engenharia - IME Brazil

ISBN: (纸本)9781467363846

The pronounced variation of the optical reflectance R of nanometer thin VO 2 films with temperature T at the phase transition recently has triggered interest in the development of compact thermo-optical sensors that utilize optical fiber technology. Its immunity against electromagnetic interference effects makes this approach suited for an optical detection of local areas with increased temperature, i.e. so called hot spots, inside of high power transformers. Optical reflectance of thin VO 2 -films as function of T throughout the hysteretic phase transition is reported in this work. A modified version of the Preisach hysteresis model is utilized, and combined with experimental optical data. Suited VO 2 film thickness values and wavelengths range for optimum sensor operation can be extracted. The achievable temperature range, as confirmed by experimental observations, is consistent with requirements that apply for power transformers of the first group, according to NBR 5416 (ABNT).

关键词： Optical fiber sensors Mathematical model Reflectivity Equations Optical fibers Temperature sensors

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Insights into the removal of microplastics from water using biochar in the era of COVID-19: A mini review

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Case studies in Chemical and Environmental engineering 2021年 4卷

作者： Abuwatfa, Waad H. Al-Muqbel, Dana Al-Othman, Amani Halalsheh, Neda Tawalbeh, Muhammad Department of Chemical Engineering American University of Sharjah Sharjah United Arab Emirates Materials Science and Engineering Ph.D. Program American University of Sharjah Sharjah United Arab Emirates Department of Civil Engineering The Hashemite University PO. Box 330127 Zarqa Jordan Sustainable and Renewable Energy Engineering University of Sharjah Sharjah United Arab Emirates

Microplastics pollution is a modern-day prevalent challenge that poses serious threats to the general wellbeing and sustainability of the planet. Due to their innately persistent nature, extreme durability, and high stability, they exhibit long residence time and could be transferred through the ecological chains. Current days have witnessed an increase in the accumulation of microplastics waste and debris. This is due to the protective measures imposed by governments and the World Health Organization (WHO) as part of the containment and mitigation efforts of the COVID-19 pandemic. Therefore, the development of versatile, robust, flexible, and efficient removal systems has become a necessity in order to control microplastics pollution. Herein, we review the repercussions of the pandemic on the state of microplastics contamination, sources and identification methods of microplastics in water, their toxicity and risks on the environment, as well as their degradation and conventional removal methods. This review focuses on adsorption and the use of biochar as one of the emerging adsorbents for the removal of microplastics. The efficiency of adsorption using biochar, mechanisms, and applications are discussed. The review addresses the increased rates of microplastics occurrence especially during the era of COVID-19, which requires more efficient and lower cost removal methods. The major conclusions drawn from this review include emphasizing the significant potential of adsorption processes in the removal of microplastics. Biochar is present among the available and most efficient biomass adsorbents especially when combined with other materials. Composite biochar materials play an important role in enhancing the removal and immobility of microplastics. However, more research is required to investigate this at a larger scale, improve efficiency and immobilization techniques. © 2021 The Authors

关键词： Adsorption Biochar COVID-19 Microplastics pollution Removal efficiency Water treatment

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Size disorder as a descriptor for predicting reduced thermal conductivity in medium- and high-entropy pyrochlores

arXiv

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arXiv 2019年

作者： Wright, Andrew J. Wang, Qingyang Ko, Shu-Ting Chung, Ka Man Chen, Renkun Luo, Jian Department of NanoEngineering University of California San Diego San DiegoCA92093 United States Department of Mechanical and Aerospace Engineering University of California San Diego San DiegoCA92093 United States Program of Materials Science and Engineering University of California San Diego San DiegoCA92093 United States

High-entropy ceramics generally exhibit reduced thermal conductivity, but little is known about what controls this suppression and which descriptor can predict it. Herein, 18 medium- and high-entropy pyrochlores were synthesized to measure their thermal conductivity and Young's modulus. Up to 35% reductions in thermal conductivity were achieved with retained moduli, thereby attaining insulative yet stiff properties for potential thermal barrier coating applications. Notably, the measured thermal conductivity correlates well with a modified size disorder parameter δsize ∗ . Thus, this δsize ∗ is suggested as a useful descriptor for designing thermally-insulative medium- and high-entropy ceramics (broadly defined as "compositionally-complex ceramics"). Copyright © 2019, The Authors. All rights reserved.

关键词： Entropy

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Metasurface polarization splitter

Metasurface polarization splitter

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作者： Slovick, Brian A. Zhou, You Yu, Zhi Gang Kravchenko, Ivan I. Briggs, Dayrl P. Moitra, Parikshit Krishnamurthy, Srini Valentine, Jason Applied Optics Laboratory SRI International Menlo ParkCA94025 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37212 United States Department of Mechanical Engineering Vanderbilt University NashvilleTN37212 United States Institute for Shock Physics Washington State University PullmanWA99164 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37831 United States Optoelectronics Research Centre University of Southampton SouthamptonSO17 1BJ United Kingdom

Polarization beam splitters, devices that separate the two orthogonal polarizations of light into different propagation directions, are among the most ubiquitous optical elements. However, traditionally polarization splitters rely on bulky optical materials, while emerging optoelectronic and photonic circuits require compact, chip-scale polarization splitters. Here, we show that a rectangular lattice of cylindrical silicon Mie resonators functions as a polarization splitter, efficiently reflecting one polarization while transmitting the other. We show that the polarization splitting arises from the anisotropic permittivity and permeability of the metasurface due to the twofold rotational symmetry of the rectangular unit cell. The high polarization efficiency, low loss and low profile make these metasurface polarization splitters ideally suited for monolithic integration with optoelectronic and photonic circuits. This article is part of the themed issue 'New horizons for nanophotonics'. © 2017 The Author(s) Published by the Royal Society. All rights reserved.

关键词： Polarization

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Breakthrough in Efficiency of Exciplex Organic Light-Emitting Diodes Using 9-Phenylfluorene Based Electron Acceptors

SSRN

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SSRN 2022年

作者： Cao, Hong-Tao Yu, Wen-Jing Gao, Ying Hou, Peng-Fei Li, Bo Feng, Quan-You Zhang, He Su, Zhong-Min Xie, Ling-Hai Nanjing University of Posts & Telecommunications 9 Wenyuan Road Nanjing210023 China Institute of Biomass Functional Materials Interdisciplinary Studies Jilin Engineering Normal University 3050 Kaixuan Road Changchun130052 China Changchun University of Science and Technology China

Exciplex-thermally activated delayed fluorescence (exciplex-TADF) system is an excellent candidate for fabrication of high-efficiency organic light-emitting diodes (OLEDs) because of its more easily achieved small singlet–triplet energy splitting (Δ E ST ) and doping-control. However, exciplex-TADF is still faced with problems of low external quantum efficiency ( η ext ) and unclear effect of the structure-modification in electron acceptors. Herein, we provide a steric hindrance-increase strategy to obtain high-efficiency exciplex-emissions. Through introducing steric hindrance group (9-phenylfluorene) into N -ethylcarbazole of the dicyano-substituted 9-phenylfluorene, more noticeable electron–hole separation is obtained in the resultant acceptor-based exciplex system, which helps the exciplex harvest smaller Δ E ST , larger driving force and higher emission efficiencies. Encouragingly, the corresponding OLED displays a maximum η ext of 25.8%, which is one of the best efficiency values among reported exciplex-OLEDs, simultaneously possessing excellent current efficiency of 83.6 cd A –1 and power efficiency of 93.7 lm W –1 . It is expected that this work will offer a new avenue for designing electron acceptors for highly efficient exciplex-emissions. © 2022, The Authors. All rights reserved.

关键词： Organic light emitting diodes (OLED)

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Novel Disordering Mechanism in Ferromagnetic Systems with Competing Interactions

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Physical Review Letters 2013年第17期111卷 177202-177202页

作者： Juan Carlos Andresen Creighton K. Thomas Helmut G. Katzgraber Moshe Schechter Theoretische Physik ETH Zurich CH-8093 Zurich Switzerland Department of Physics and Astronomy Texas A&M University College Station Texas 77843-4242 USA Materials Science and Engineering Program Texas A&M University College Station Texas 77843 USA Department of Physics Ben Gurion University Beer Sheva 84105 Israel

Ferromagnetic Ising systems with competing interactions are considered in the presence of a random field. We find that in three space dimensions the ferromagnetic phase is disordered by a random field which is considerably smaller than the typical interaction strength between the spins. This is the result of a novel disordering mechanism triggered by an underlying spin-glass phase. Calculations for the specific case of the long-range dipolar LiHoxY1−xF4 compound suggest that the above mechanism is responsible for the peculiar dependence of the critical temperature on the strength of the random field and the broadening of the susceptibility peaks as temperature is decreased, as found in recent experiments by Silevitch et al.. [Nature (London) 448, 567 (2007)]. Our results thus emphasize the need to go beyond the standard Imry-Ma argument when studying general random-field systems.

关键词： FERROMAGNETIC materials RANDOM fields CRITICAL temperature (Chemistry) POROUS materials ANISOTROPY

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Exciton transport under periodic potential in MoSe2/WSe2 heterostructures

arXiv

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arXiv 2020年

作者： Li, Zidong Lu, Xiaobo Cordovilla Leon, Darwin F. Hou, Jize Lu, Yanzhao Kaczmarek, Austin Lyu, Zhengyang Taniguchi, Takashi Watanabe, Kenji Zhao, Liuyan Yang, Li Deotare, Parag B. Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Physics Washington University in St. Louis St. LouisMO63130 United States Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Physics University of Michigan Ann ArborMI48109 United States National Institute for Materials Science Tsukuba Japan Institute of Materials Science and Engineering Washington University in St. Louis St. LouisMO63130 United States

The predicted formation of moiré superlattices leading to confined excitonic states in heterostructures formed by stacking two lattice mismatched transition metal dichalcogenide (TMD) monolayers was recently experimentally confirmed. Such periodic potential in TMD heterostructure functions as a diffusion barrier that affects the energy transport and dynamics of interlayer excitons (electron and hole spatially concentrated in different monolayers). Understanding the transport of excitons under such condition is essential to establish the material system as a next generation device platform. In this work, we experimentally quantify the diffusion barrier experienced by the interlayer excitons in a hexagonal boron nitride (h-BN) – encapsulated, molybdenum diselenide/tungsten diselenide (MoSe2/WSe2) heterostructure by studying the exciton transport at various temperatures. Copyright © 2020, The Authors. All rights reserved.

关键词： Selenium compounds

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Radiative transport produced by oblique illumination of turbid media with collimated beams

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Physical Review E 2013年第6期87卷 063308-063308页

作者： Adam R. Gardner Arnold D. Kim Vasan Venugopalan Department of Chemical Engineering and Materials Science University of California Irvine Irvine California 92697 USA Laser Microbeam and Medical Program Beckman Laser Institute University of California Irvine Irvine California 92697 USA Applied Mathematics Unit School of Natural Sciences University of California Merced 5200 North Lake Road Merced California 95343 USA

We examine the general problem of light transport initiated by oblique illumination of a turbid medium with a collimated beam. This situation has direct relevance to the analysis of cloudy atmospheres, terrestrial surfaces, soft condensed matter, and biological tissues. We introduce a solution approach to the equation of radiative transfer that governs this problem, and develop a comprehensive spherical harmonics expansion method utilizing Fourier decomposition (SHEFN). The SHEFN approach enables the solution of problems lacking azimuthal symmetry and provides both the spatial and directional dependence of the radiance. We also introduce the method of sequential-order smoothing that enables the calculation of accurate solutions from the results of two sequential low-order approximations. We apply the SHEFN approach to determine the spatial and angular dependence of both internal and boundary radiances from strongly and weakly scattering turbid media. These solutions are validated using more costly Monte Carlo simulations and reveal important insights regarding the evolution of the radiant field generated by oblique collimated beams spanning ballistic and diffusely scattering regimes.

关键词： MONTE Carlo method COLLIMATED light TURBIDITY RADIATIVE transfer RADIATION OPTICAL properties

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Enhancing Zinc Electrode Stability Through Pre-Desolvation and Accelerated Charge Transfer Via a Polyimide Interface

SSRN

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SSRN 2023年

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, we mitigate these issues 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 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 water molecule interactions and side reactions at the electrode. 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 three-dimensional 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. © 2023, The Authors. All rights reserved.

关键词： Charge transfer

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