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Interfacial studies of Cu₂O/TiO₂ junction deposited at different electropotentials

Results in physics 2024年 64卷

作者： Faheem, Muhammad Basha, Beriham Al-Buriahi, M.S. Alrowaili, Z.A. Mahmood, K. Ali, A. Ramzan Khawar, Muhammad Cho, Chungyeon choi, Dongwhi Hussain, S. Department of Physics Division of Science and Technology University of Education Lahore Department of Physics College of Sciences Princess Nourah Bint Abdulrahman University Department of Physics Sakarya University Department of Physics College of Science Jouf University Department of Physics Government College University Faisalabad Department of Mechanical Engineering (Integrated Engineering Program) Kyung Hee University Department of Carbon Convergence Engineering College of Engineering Wonkwang University

Based on the simplistic two-step preparation method, a Cu2O/TiO2 junction was synthesized by electrodepositing a Cuprous Oxide layer on Titanium Oxide thin films at different deposition potentials. The thin films and ... 详细信息

Based on the simplistic two-step preparation method, a Cu₂O/TiO₂ junction was synthesized by electrodepositing a Cuprous Oxide layer on Titanium Oxide thin films at different deposition potentials. The thin films and junction were characterized for their structural, morphological, optical, and electrical properties using X-ray diffraction, Scanning Electron Microscopy, UV–visible spectroscopy, and Electrochemical Impedance Spectroscopy. The XRD analysis of the Cu₂O/TiO₂ junction indicated no sharp diffraction peaks of TiO₂, only Cu₂O peaks were observed. The Scanning Electron Microscopy also demonstrated that the Cuprous Oxide thin films possessed three-sided pyramidal structures on their surface. The band gaps of Cu₂O and TiO₂ thin films were calculated as 2.2 eV and 3.3 eV respectively by using Tauc's plots. Electrochemical impedance spectroscopy revealed reduced interfacial charge transfer resistance and a boost in charge carrier generation in fabricated junctions (grown at −0.6 V). The flat band potentials and carrier concentrations of the fabricated thin films and their junction were calculated using Mott-Schottky analysis. Meanwhile, charge transfer resistance, solution resistance, constant phase element, and other circuit parameters of the electrochemical cell were studied using Nyquist plots. © 2024 The Author(s)

关键词： Cuprous oxide Electrochemical impedance spectroscopy Electrodeposition Titanium oxide

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TiO2-based Flexible Integrated Photonics for High-sensitivity Temperature Sensing

TiO2-based Flexible Integrated Photonics for High-sensitivit...

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CLEO: Science and Innovations, S and I 2022

作者： Zhao, Xuan Fan, Bo Veeraraghavan, Ashok Robinson, Jacob Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Electrical & Computer Engineering Rice University HoustonTX77005 United States

We report a flexible temperature sensor based on TiO2 photonics that shows double the sensitivity compared to silicon photonics. This high sensitivity and biocompatibility pave the way towards point-of-care temperatur... 详细信息

ISBN: (纸本)9781557528209

关键词： Titanium dioxide

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1T-TaS2 based dynamically tunable plasmonic metasurface

1T-TaS2 based dynamically tunable plasmonic metasurface

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CLEO: QELS_Fundamental Science, QELS 2022

作者： Li, Weijian Naik, Gururaj V. Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Electrical & Computer Engineering Rice University HoustonTX77005 United States

We demonstrate a dynamically tunable plasmonic metasurface enabled by light-tunable optical constants of a quantum material - 1T-TaS2. We observe a relative reflectance change of 10% under low-intensity incoherent ill... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781557528209

关键词： Reflectivity MIM devices Lighting Lasers and electrooptics Metasurfaces Plasmons Optical materials

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Performance Evaluation of "XRPIX" Event-Driven SOI Pixel Detector for Cosmic MeV Gamma-ray Observation 38

Performance Evaluation of "XRPIX" Event-Driven SOI Pixel Det...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Hashizume, Masaki Suda, Yusuke Fukazawa, Yasushi Tsuru, Takeshi Go Takeda, Ayaki Physics Program Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima Japan Kyoto University Graduate School of Science Yoshida-Honmachi Sakyo-ku Kyoto Japan University of Miyazaki Department of Technology 1-1 Gakuen Kibanadai-nishi Miyazaki Japan

Cosmic MeV gamma-ray observations are important for elucidating physics in high-energy objects such as gamma-ray bursts and active galactic nuclear jet blazars, for detecting nuclear gamma-rays in supernova explosions, and for advancing multi-messenger astronomy. However, there has been no progress since the COMPTEL detector on board the CGRO satellites in the 1990s, and a satellite for MeV gamma-ray observations is essential. Compton scattering is the dominant interaction between MeV gamma-rays and matter. The minimal way to reconstruct the arrival direction of an incident gamma-ray is to utilize both the deposit energy and hit position measured in both the scatterer and absorber, giving an event circle. The circle can be reduced to an arc if the initial direction of the Compton scattered electron is measured. Thus such an electron-tracking Compton camera is expected to improve the source sensitivity by reducing background events. Therefore, our goal is to enable more accurate Compton imaging by using an event-driven SOI pixel detector "XRPIX" as a scatterer in an electron-track Compton camera. The pixel size of XRPIX is as small as 36 um square, so it is expected to capture electron trajectories for scattering of gamma-rays of several hundred keV. In this contribution, we report on the evaluation of the depletion layer thickness of XRPIX8.5, which can be fully depleted at room temperature, the sensor response when irradiated with gamma-rays such as 662 keV of Cs-137 and 511 keV of Na-22, and a method for estimating the direction of scattered electrons. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

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Thermo-optical properties of erbium-doped germanate-bismuth glasses

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Optical Materials 2025年 166卷

作者： Silva, Adriano Almeida Lima, Lucas Batista Silva da Silva, Isis Lee Garcia, Hans Anderson Bell, Maria José Valenzuela Kassab, Luciana Reyes Pires Santos, Francisco Eroni Paz Postgraduate Program in Physics Federal University of Piauí PI 64049550 Brazil Department of Physics Federal University of Juiz de Fora MG Juiz de Fora36036-900 Brazil Faculdade de Tecnologia São Paulo CEETEPS SP São Paulo01124060 Brazil Postgraduate Program in Engineering and Materials Science Federal University of Teresina PI 64049550 Brazil

In this study, we investigate the thermo-optical properties of GeO2–Bi2O3 glasses doped with different concentrations of rare earth ions by thermal lens technique;UV-VIS and photoluminescence (PL) spectroscopy, as well as measurements of thermal diffusivity, thermal conductivity and quantum efficiency, are presented aiming at potential photonic applications. High infrared fluorescence lifetimes around 4 ms and quantum efficiencies of ∼80 % for 1 % Er3+ concentration, determined via lifetime and thermal lens methods, enabled efficient laser operation. Positive ds/dT values confirmed the self-focusing nature beneficial for high-power systems. While quantum efficiencies decreased exponentially with rising Er3+ due to non-radiative relaxation from erbium-matrix interactions, reasonably high efficiencies above 74 % persisted at 1 % doping. The thermal diffusivity and conductivity exhibited little changes with varying Er3+ concentration and showed to be matrix dependent. © 2025 Elsevier B.V.

关键词： Quantum efficiency

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Observation of the symmetry-protected signature of 3-body interactions

arXiv

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arXiv 2024年

作者： Zhukas, Liudmila A. Wang, Qingfeng Katz, Or Monroe, Christopher Marvian, Iman Duke Quantum Center Departments of Electrical and Computer Engineering and Physics Duke University DurhamNC27708 United States Chemical Physics Program Institute for Physical Science and Technology University of Maryland College ParkMD United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States

Identifying and characterizing multi-body interactions in quantum processes remains a significant challenge. This is partly because 2-body interactions can produce an arbitrary time evolution, a fundamental fact often called the universality of 2-local gates in the context of quantum computing. However, when an unknown Hamiltonian respects a U(1) symmetry such as charge or particle number conservation, N-body interactions exhibit a distinct symmetry-protected signature known as the N-body phase, which fewer-body interactions cannot mimic. We develop and demonstrate an efficient technique for the detection of 3-body interactions despite the presence of unknown 2-body interactions. This technique, which takes advantage of GHZ states for phase estimation, requires probing the unitary evolution and measuring its determinant in a small subspace that scales linearly with the system size, making it an efficient approach. Copyright © 2024, The Authors. All rights reserved.

关键词： Hamiltonians

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Fabrication of SnSO4 transparent thin-films using simultaneous oxidation and sulfurization annealing

Fabrication of SnSO4 transparent thin-films using simultaneo...

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Joint e-Manufacturing and Design Collaboration Symposium (eMDC) & International Symposium on Semiconductor Manufacturing (ISSM)

作者： Kento Moriya Daiki Watanabe Taiki Ogawa Tomohiro Yamaguchi Shinya Aikawa Electrical and Electronic Engineering Program Kogakuin University Tokyo Japan Dept. of Electrical and Electronic Engineering Kogakuin University Tokyo Japan Dept. of Applied Physics Kogakuin University Tokyo Japan

ISBN: (数字)9798331510589

ISBN: (纸本)9798331510596

SnSO 4 has a layered structure and is a promising candidate as a p-type transparent semiconductor with a band gap of 3.9 eV and hole effective mass of 0.88, theoretically. However, there has been no report on experimental fabrication of the semiconductor thin films. Here, we attempt trying fabrication of SnSO4 thin films and investigating their electrical properties to clarify the possibility of SnSO4 thin films as p-type transparent semiconductors.

关键词： Fabrication Annealing Semiconductor thin films Photonic band gap Semiconductor device manufacture Oxidation Effective mass

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Quantitative EEG Analysis Based on PSD and eLORETA-Source Localization Approach in Spatial Auditory Process

Quantitative EEG Analysis Based on PSD and eLORETA-Source Lo...

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International Conference on Instrumentation Control and Automation (ICA)

作者： Masitoh Masitoh Suprijanto Suprijanto R. S. Joko Sarwono Doctoral Program of Engineering Physics Institut Teknologi Bandung Bandung Indonesia Instrumentation and Control Research Group Institut Teknologi Bandung Bandung Indonesia Engineering Physics Research Group Institut Teknologi Bandung Bandung Indonesia

The advancement of spatial audio technology has been driven by the human capacity for spatial auditory, enabling immersive auditory experiences that replicate real-life sound environments. Understanding how the brain encodes spatial auditory processes has emerged as a growing area of research. Electroencephalography (EEG), a non-invasive modality with high temporal resolution, offers an ideal means to study brain responses to moving sound stimuli. This study aims to compare quantitative EEG methods derived from direct EEG recordings, focusing on EEG temporal features such as Power Spectral Density (PSD), as well as EEG source localization using eLORETA. Two types of audio stimuli, stereo audio and spatial audio, delivered through headsets attached directly to both ears, were investigated. When exposed to the spatial audio stimulus, there was a notable increase in the mean PSD within the Theta, Alpha, and Beta frequency bands in the auditory cortex (channel T3, T4, T5, and T6). The most significant increase was observed in the Beta frequency band of 145.601 µV 2 /Hz in T4, indicating heightened focus experienced by the subjects compared to the stereo audio stimulus. Furthermore, EEG source localization using eLORETA revealed distinct activation in the frontal area during the second experiment involving the spatial audio stimulus. Specifically, there was a significant increase (p>0.05) in current density within the frontal regions of the brain, including Brodmann Area (BA) 6 and 9, which are associated with selective attention and spatial orientation. These findings highlight the practicality of the employed methods and their potential to shed light on brain activity during spatial auditory processes.

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A hybrid few-group homogenization approach for coupled nodal diffusion-thermal hydraulic analysis of nuclear thermal propulsion reactors

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Annals of Nuclear Energy 2025年 222卷

作者： Smith, Jacob D. Kotlyar, Dan Nuclear and Radiological Engineering and Medical Physics Program George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332-0405 United States

Multiphysics coupled analysis for Nuclear Thermal Propulsion (NTP) systems are important for producing accurate core safety margins as the operation dependent thermal–hydraulic (T/H) parameters vary drastically across the core. Through the range of coupled physics model's fidelities, neutronics solutions for NTP reactors are primarily found using Monte Carlo (MC) transport solvers, which produce accurate results at the cost of high computational expense. The motivation for this research is to avoid the computational bottleneck of obtaining high-fidelity, neutronics solutions at every iteration by replacing the MC code with a reduced-order nodal diffusion code. Nodal diffusion analysis is widely used for Light Water Reactors (LWRs) with a standard method that involves pre-generated group constants for unique fuel types homogenized on the assembly level. A series of publications from the authors has detailed the efforts devoted to conducting steady-state, isothermal neutronics modeling of a NERVA-derived NTP reactor core using the nodal diffusion code, DYN3D, with homogenized two-group constant generated with the MC code Serpent and uniform discontinuity factors (UDFs) found using a Jacobian-Free Newton Krylov method (JFNK). The work presented in this paper is the culmination of these efforts, featuring the first demonstration of the finalized hybrid cross section generation approach and the subsequent use in full core simulations. The hybrid approach uses both full core and infinite lattice MC models to efficiently generate two-group homogenized parameters with unique T/H fields representative of a power ramp-up, interpolating on both cross sections and discontinuity factors as a function of control drum angle, fuel temperature, moderator temperature, and moderator coolant density. The results show that the hybrid approach to pre-generating group constants and correction parameters produces a set of data that can be used to obtain accurate – in comparison to the refe

关键词： Importance sampling

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Electrically tunable graphene-based multi-band terahertz metamaterial filters

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Optics Express 2023年第1期31卷 469-478页

作者： Wu, Pei-Jung Tsai, Wei-Cheng Yang, Chan-Shan Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei11677 Taiwan Department of Physics National Taiwan Normal University Taipei11677 Taiwan Micro/Nano Device Inspection and Research Center National Taiwan Normal University Taipei106 Taiwan Center National Cheng Kung University Tainan70101 Taiwan

In this study, we have designed an electrically tunable multi-band terahertz (THz) metamaterial filter based on graphene and multiple-square-loop structures. The structure contains multiple metal square loops, and these loops with different sizes correspond to different THz frequencies, achieving our expected efficacy of a multiband wave filter. Furthermore, by sweeping external voltages, we could change graphene’s Fermi levels, and thus the high-sensitivity THz filter’s capability from single-band to multi-band filtering can be modulated. We expect that this study of a hybrid THz wave filter would be promising for the development of selecting channels in THz and 6 G communications. © 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Graphene

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