Results in Physics最新文献_第3页

Influence of Sr doping on BaTiO3 properties: A combined DFT and experimental approach 掺杂 Sr 对 BaTiO3 性能的影响：DFT 与实验相结合的方法

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-13 DOI: 10.1016/j.rinp.2024.108041

Maria Khalil , Muhammad Tauseef Qureshi , Mahmoud Al Elaimi , Lubna Aamir , Munir Ahmad , Musfira Saleem , Murtaza Saleem

{"title":"Influence of Sr doping on BaTiO3 properties: A combined DFT and experimental approach","authors":"Maria Khalil , Muhammad Tauseef Qureshi , Mahmoud Al Elaimi , Lubna Aamir , Munir Ahmad , Musfira Saleem , Murtaza Saleem","doi":"10.1016/j.rinp.2024.108041","DOIUrl":"10.1016/j.rinp.2024.108041","url":null,"abstract":"<div><div>Barium titanate (BaTiO<sub>3</sub>) has been extensively used as a compound due to its potential for optoelectronics and electronic applications. The density functional theory (DFT) calculations as well as chemically prepared thin films were used to investigate the effect of the alkaline earth metal Sr on the electronic, thermoelectric, structural, morphological, and optical properties of the BaTiO<sub>3</sub> host matrix.It was found in band structure analysis that the bandgap nature changed from indirect to direct bandgap upon incorporation of the Sr atom into the BaTiO<sub>3</sub> host lattice. Thermoelectric characteristics showed notable changes in response to temperature and doping. The investigation demonstrated that optimized electrical conductivity, reduced thermal conductivity, and an enhanced Seebeck coefficient were achieved with a precise (5.55 %) Sr content. XRD analysis revealed the cubic phase of the prepared thin films. Morphological investigation showed the evolution of grain with the increase in dopant contents. The theoretical and experimentally measured optical characteristics also revealed that Sr doping improved the material’s refractive index, conductivity, and absorption coefficient in the visible and ultraviolet energy ranges. Significant enhancements in electronic, thermoelectric, and optical properties suggest that doped BaTiO<sub>3</sub> could be considered a potential applicant for optoelectronic as well as thermoelectric applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108041"},"PeriodicalIF":4.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabricating model heterostructures of large-area monolayer or bilayer MoS2 on an Au(111) surface under ultra-high vacuum 在超高真空下在金(111)表面制备大面积单层或双层 MoS2 异质结构模型

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-12 DOI: 10.1016/j.rinp.2024.108042

Bingrui Li, Weiwei Huang, Chaoqi Dai, Boyuan Wen, Yan Shen, Fei Liu, Ningsheng Xu, Fangfei Ming, Shaozhi Deng

{"title":"Fabricating model heterostructures of large-area monolayer or bilayer MoS2 on an Au(111) surface under ultra-high vacuum","authors":"Bingrui Li, Weiwei Huang, Chaoqi Dai, Boyuan Wen, Yan Shen, Fei Liu, Ningsheng Xu, Fangfei Ming, Shaozhi Deng","doi":"10.1016/j.rinp.2024.108042","DOIUrl":"10.1016/j.rinp.2024.108042","url":null,"abstract":"<div><div>Fabricating heterojunctions with precisely controlled interfacial structures is crucial for exploring novel low-dimensional physics and for realizing high-performance devices. However, such capabilities are often constrained by contamination from the ambient environment or by the limitations of applicable methods and materials under vacuum conditions. In this study, MoS<sub>2</sub>/Au(111) heterostructures were fabricated by exfoliating MoS<sub>2</sub> thin layers onto a crystallized Au(111) surface using a gold-assisted exfoliation method in an ultra-high vacuum environment. This method yields millimeter-sized monolayer or sub-millimeter-sized bilayers with contamination-free interfaces, which are unattainable for samples made in air. Scanning tunneling microscopy revealed that both the monolayer and the bilayer exhibit uniform and well-ordered moiré superlattices controlled by the twisting angle between the Au(111) surface and the MoS<sub>2</sub> overlayer. The direct contact with the Au surface renders the monolayer MoS<sub>2</sub> weakly metallic, while a less coupled bilayer is semiconducting, indicating a 0.54 eV Schottky barrier for the MoS<sub>2</sub>/Au(111) contact. This method is applicable to various combinations of van der Waals materials and metal surfaces. The uniform and controllable heterojunctions can serve as ideal model systems for exploring semiconductor–metal interfaces and atomic structures formed within.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108042"},"PeriodicalIF":4.4,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Room-temperature negative differential resistance in gate-tunable Weyl semimetal transistors 栅极可调谐韦尔半金属晶体管中的室温负差分电阻

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-10 DOI: 10.1016/j.rinp.2024.108039

Shih-Hung Cheng, Ting-I Kuo, Er-Feng Hsieh, Wen-Jeng Hsueh

引用次数: 0

An investigation of n-type semiconductors based on optical and photoluminescence of pure and Al doped Pr:123 compound 基于纯净和掺铝 Pr:123 化合物的光学和光致发光对 n 型半导体的研究

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-08 DOI: 10.1016/j.rinp.2024.108033

Abdullah Almohammedi

{"title":"An investigation of n-type semiconductors based on optical and photoluminescence of pure and Al doped Pr:123 compound","authors":"Abdullah Almohammedi","doi":"10.1016/j.rinp.2024.108033","DOIUrl":"10.1016/j.rinp.2024.108033","url":null,"abstract":"<div><div>With ZnO comparison, we report here an investigation of n-type semiconductors in terms of optical and photoluminescence (PL) analysis based on PrBa<sub>2</sub>Cu<sub>3-3x</sub>Al<sub>3x</sub>O<sub>y</sub> (AlPr:123) compound with (0.00 ≤ x ≤ 1.00). The structure is tetragonal of the samples with x ≤ 0.30 and changes to orthorhombic for x > 0.30, whereas it is wurtizite (hexagonal) for ZnO. As x increases to 1.00, the grain size is decreased, while the crystallite size and porosity are increased, but they are comparable with those obtained for ZnO. The Debye temperature, Young’s modulus and energy gap are drastically decreased by increasing x until reach to their maximum values of 623.14 K, 952 GPa and 3.45 eV for x = 1.00 (650.39 K, 17 GPa and 3.28 eV for ZnO). The x = 0.05 has increased the carrier density to 8.06 × 10 <sup>19</sup> (cm<sup>−3</sup>), which is about 8-times higher than of ZnO (1.07 × 10 <sup>19</sup> (cm <sup>−3</sup>). The highest value of q-factor (3.5 × 10 <sup>5</sup>) is obtained for x = 0.00, which is about 10-tims higher than of ZnO (3 × 10 <sup>4</sup>). As x increases above 0.30, the optical conductivity is significantly increased to be greater than that of ZnO. The PL intensity of the visible emission peaks was gradually increases against x until becomes higher than that of ZnO when x = 1.00. A slight UV shift is obtained for x ≤ 0.30 samples, but it changed to blue for x ≥ 0.60, which is typically similar to ZnO. As compared to ZnO, the present samples are strongly recommended for plastic deformation, solar cell, light emission, super-capacitor and high-power operation. To the best of our knowledge, the present work has never been done elsewhere.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108033"},"PeriodicalIF":4.4,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142699206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards the CdS/SnSe solar cell optimization: Understanding the transport mechanisms 实现 CdS/SnSe 太阳能电池的优化：了解传输机制

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-06 DOI: 10.1016/j.rinp.2024.108035

A. Carrillo-Osuna , F.J. Sánchez-Rodríguez , K.G. Rodriguez-Osorio , I. Montoya De Los Santos , J.P. Morán-Lázaro , M. Ojeda-Martínez , Laura M. Pérez , David Laroze , Maykel Courel

{"title":"Towards the CdS/SnSe solar cell optimization: Understanding the transport mechanisms","authors":"A. Carrillo-Osuna , F.J. Sánchez-Rodríguez , K.G. Rodriguez-Osorio , I. Montoya De Los Santos , J.P. Morán-Lázaro , M. Ojeda-Martínez , Laura M. Pérez , David Laroze , Maykel Courel","doi":"10.1016/j.rinp.2024.108035","DOIUrl":"10.1016/j.rinp.2024.108035","url":null,"abstract":"<div><div>In this work, numerical simulation results on SnSe solar cells are presented. The influence of loss mechanisms such as radiative recombination, SnSe bulk recombination, and CdS/SnSe interface recombination on the device is studied in detail under and without the influence of resistances for the first time. In the first step, our model is validated by accurately reproducing the experimental available data. We found that non-radiative recombination originated by SnSe bulk defects in combination with high series resistances are dominant loss mechanisms, resulting in efficiency values lower than 2 %. In addition, the important role of the CdS/SnSe interface is also evidenced, since SnSe solar cells without bulk defects and resistances would not be able to overcome the efficiency barrier of 10 % because of the cliff-like band alignment. The role of each loss mechanism on SnSe solar cell performance was studied as a function of material thicknesses, carrier concentrations, bulk and interface defects, and resistances for device optimization. We demonstrated that conversion efficiency of 21.8 % with an open-circuit voltage, short-circuit current density, and fill factor values of 0.82 V, 31.6 mA/cm<sup>2</sup>, 84.6 %, respectively can be achieved in the optimized device under the standard conditions of AM 1.5G illumination and 300 K.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108035"},"PeriodicalIF":4.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From data to dynamics: Reconstructing soliton collision phenomena in optical fibers using a convolutional autoencoder 从数据到动力学：利用卷积自动编码器重构光纤中的孤子碰撞现象

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-05 DOI: 10.1016/j.rinp.2024.108027

Qibo Xu , Jifang Rong , Qilin Zeng , Xiaofang Yuan , Longnv Huang , Hua Yang

引用次数: 0

Forced vibration assessment of moderately thick carbon nanotube-reinforced composite plates 中等厚度碳纳米管增强复合板的受迫振动评估

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-05 DOI: 10.1016/j.rinp.2024.108034

Reza Setayesh , Shahabeddin Hatami , Mojtaba Gorji Azandariani , Mohammad Zamani Nejad

{"title":"Forced vibration assessment of moderately thick carbon nanotube-reinforced composite plates","authors":"Reza Setayesh , Shahabeddin Hatami , Mojtaba Gorji Azandariani , Mohammad Zamani Nejad","doi":"10.1016/j.rinp.2024.108034","DOIUrl":"10.1016/j.rinp.2024.108034","url":null,"abstract":"<div><div>Carbon nanotubes, distributed in composite sheets with various arrangements, can lead to the development of materials with functionally graded properties. In the present study, the method of spectral components was used to investigate the free vibration frequencies and dynamic responses of single-layer sheets reinforced with carbon nanotubes. The spectral component method offers significant advantages for high-frequency dynamic problems, as it requires fewer fine elements to solve boundary conditions. Based on the first-order shear theory, the governing equations of sheet vibration are derived. The discrete Fourier transform is applied to convert the differential equations from the time domain to the frequency domain. Using dynamic shape functions obtained from the exact solutions, the stiffness matrix of the spectral element is constructed. Dynamic frequency responses are then derived, and time-domain responses are obtained using the inverse Fourier transform. The study extracted the exact natural frequencies of functionally graded sheets and verified them with results from the literature, showing high accuracy with a minimal number of elements. The spectral finite element method of fundamental natural frequencies for different ratios of modulus of elasticity and width-to-thickness ratios obtained were investigated and compared with the results of research. The forced vibration was addressed, demonstrating that the method efficiently captures dynamic responses under different carbon nanotube distributions, with spectral displacements verified through numerical comparison. These findings demonstrate the capability and efficiency of the spectral finite element method for analyzing carbon nanotube-reinforced composite plates.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108034"},"PeriodicalIF":4.4,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing the anti-tarnish and mechanical properties of gold-coated silver sheets for decorative applications using TiO2 film protection 利用二氧化钛薄膜保护增强装饰用镀金银板的防变色性能和机械性能

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-05 DOI: 10.1016/j.rinp.2024.108036

Sarocha Khanwaeo , Pisan Srirach , Pichet Limsuwan , Aparporn Sakulkalavek , Rachsak Sakdanuphab

{"title":"Enhancing the anti-tarnish and mechanical properties of gold-coated silver sheets for decorative applications using TiO2 film protection","authors":"Sarocha Khanwaeo , Pisan Srirach , Pichet Limsuwan , Aparporn Sakulkalavek , Rachsak Sakdanuphab","doi":"10.1016/j.rinp.2024.108036","DOIUrl":"10.1016/j.rinp.2024.108036","url":null,"abstract":"<div><div>This study explores an innovative method to enhance the anti-tarnish and mechanical properties of gold-coated silver sheets, targeting decorative applications through the TiO<sub>2</sub> film coatings. The research focuses on gold films with a thickness of approximately 100 nm, and TiO<sub>2</sub> films ranging from 10 to 31 nm. It was observed that the color of the multilayer coatings exhibited significant sensitivity to variations in thickness, indicating that a TiO<sub>2</sub> coating with a thickness around 20 nm could be optimally applied to the gold film, maintaining an acceptable <em>ΔE</em> value. X-ray photoelectron spectroscopy analysis demonstrated the TiO<sub>2</sub> film’s potential to inhibit the formation of Ag<sub>2</sub>S on the surface, thereby enhancing tarnish resistance. Furthermore, the application of a 20 nm TiO<sub>2</sub> layer reduced the friction coefficient from 0.28 to 0.24 for gold-coated silver. Durability tests involving 1,000 abrasion cycles revealed that the gold film without TiO<sub>2</sub> protection experienced delamination, with only about 57 % of the coated area remaining intact. In contrast, the samples protected with a TiO<sub>2</sub> layer retained approximately 90 % of the coating, underscoring the effectiveness of TiO<sub>2</sub> in preserving the structural integrity and appearance of the gold-coated silver sheets.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108036"},"PeriodicalIF":4.4,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Progress in laser active detection technology based on the cat’s eye effect 基于猫眼效应的激光主动探测技术的进展

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-04 DOI: 10.1016/j.rinp.2024.108030

Xinchen Du , Chunrui Wang , Haoran Zhou , Yunfeng Zhang , Jin Guo , Fei Chen

{"title":"Progress in laser active detection technology based on the cat’s eye effect","authors":"Xinchen Du , Chunrui Wang , Haoran Zhou , Yunfeng Zhang , Jin Guo , Fei Chen","doi":"10.1016/j.rinp.2024.108030","DOIUrl":"10.1016/j.rinp.2024.108030","url":null,"abstract":"<div><div>Laser active detection technology utilizing the cat’s eye effect is widely applied in rapid reconnaissance, positioning, and target information acquisition. This paper examines the theory of the cat’s eye effect in optical systems and its application in the field of laser active detection. This study assesses the development trend of this technology and the feasibility of implementing long-range target laser active detection. Initially, the working principle of the laser active detection system based on the cat’s eye effect is elucidated. Additionally, this paper compares and analyzes three methods of laser active detection using the cat’s eye effect: geometric optics, physical optics, and angular spectrum propagation. Subsequently, the characteristics and processing methods of cat’s eye target echo data are investigated. Finally, the paper summarizes the main challenges of this technology and assesses its development trends based on engineering requirements. The application of the cat’s eye effect in laser active reconnaissance involves linking the cat’s eye optical system with the target’s optical structure and motion state, optimizing data extraction and recognition algorithms to acquire multidimensional feature information, and enabling real-time detection of high-speed moving targets.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108030"},"PeriodicalIF":4.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of intelligent computing via Levenberg Marquardt algorithm (LMA) for accurate prediction of fluid forces in a transient non-Newtonian thermal flow 通过 Levenberg Marquardt 算法（LMA）测量智能计算，准确预测瞬态非牛顿热流中的流体力

IF 4.4 2区物理与天体物理

Results in Physics Pub Date : 2024-11-02 DOI: 10.1016/j.rinp.2024.108032

Atif Asghar , Rashid Mahmood , Afraz Hussain Majeed , Ahmed S. Hendy , Mohamed R. Ali

{"title":"Measurement of intelligent computing via Levenberg Marquardt algorithm (LMA) for accurate prediction of fluid forces in a transient non-Newtonian thermal flow","authors":"Atif Asghar , Rashid Mahmood , Afraz Hussain Majeed , Ahmed S. Hendy , Mohamed R. Ali","doi":"10.1016/j.rinp.2024.108032","DOIUrl":"10.1016/j.rinp.2024.108032","url":null,"abstract":"<div><div>Predicting precise results for the quantities of interest in time-dependent Computational Fluid Dynamics (CFD) simulations requires a significant investment of computational resources and time. To get around these issues, CFD simulations have been joined with Artificial Neural Networks (ANN). An optimally configured artificial neural network (ANN) is given the training and validation data sets produced by computational fluid dynamics (CFD). The flow around a cylinder, which is a well-known benchmark problem for incompressible flows, has been taken into consideration by the hybrid-CFD system. The mathematical model is based on the non-stationary Navier-Stokes and energy equations with viscosity. The basic architecture of the ANN model consists of 10 hidden layers, three output levels, and five input layers. Fast second-order LMA, a top-tier approach, was used to train the network. Both the Mean Square Error (MSE) and the coefficient of determination (R) provide statistical evidence that the ANN projected values for the drag and lift coefficients and average Nusselt number obtained from the finite element analysis are accurate. This analysis suggests that ANNs have the potential to significantly cut down on the amount of time and energy needed to run time-dependent simulations.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108032"},"PeriodicalIF":4.4,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0