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Structural,optical properties and optical modelling of hydrothermal chemical growth derived Zn O nanowires

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Transactions of Nonferrous Metals Society of China 2020年第1期30卷 191-199页

作者： Hin On CHU Quan WANG Yong-jing SHI Shi-geng SONG Wei-guo LIU Shun ZHOU Des GIBSON Yahya alAJLANI Cheng LI Institute of Thin Films Sensors and ImagingUniversity of the West of ScotlandPaisleyPA12BEUnited Kingdom Institute of Optoelectronic Engineering Xi’an Technological UniversityXi’an 710021China School of Metallurgy and Material Engineering Chongqing University of Science and TechnologyChongqing 401331China department of physics Faculty of ScienceJazan UniversityJazanSaudi Arabia School of Energy and Power Institute of Energy and Power TechnologyChangchun Institute of TechnologyChangchun 130103China

Zn O nanowire films were produced at 90°C using a hydrothermal chemical deposition method,and were characterised with scanning electron microscopy,optical transmission spectrometry and X-ray *** results showed that the optical band gap is 3.274-3.347 e *** porosity and microstructure can be controlled by adjusting the p H of the growth *** O nanowire films comprise a 2-layer structure as demonstrated by SEM analysis,showing different porosities for each *** analysis shows preferential growth in the(002)orientation.A comprehensive optical modelling method for nanostructured Zn O thin films was proposed,consisting of Bruggeman effective medium approximations,rough surface light scattering and O’Leary-Johnson-Lim *** optical transmission of nanostructured Zn O films agreed well with experimental data.

关键词： Zn O nanowires hydrothermal synthesis optical modelling

A Generalized （G＇/G）-Expansion Method to Find the Traveling Wave Solutions of Nonlinear Evolution Equations

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Journal of Partial Differential Equations 2011年第1期24卷 55-69页

作者： GEPREEL Khaled A Mathematics department Faculty of Science Zagazig University Zagazig Egypt.Mathematics Department Faculty of Science Tail University El-Tail EI-HawiyahP.O. Box 888 Kingdom of Saudi Arabia.

In this article, we construct the exact traveling wave solutions for nonlinear evolution equations in the mathematical physics via the modified Kawahara equation, the nonlinear coupled KdV equations and the classical Boussinesq equations, by using a generalized （G＇/G）-expansion method, where G satisfies the Jacobi elliptic equation. Many exact solutions in terms of Jacobi elliptic functions are obtained.

关键词： A generalized (G'/G)-expansion method traveling wave solutions the modifiedKawahara equation the coupled KdV equations the classical Boussinesq equations the Jacobielliptic functions.

There is plenty of room at the top:generation of hot charge carriers and their applications in perovskite and other semiconductor-based optoelectronic devices

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Light(Science & Applications) 2021年第9期10卷 1630-1657页

作者： Irfan Ahmed Lei Shi Hannu Pasanen Paola Vivo Partha Maity Mohammad Hatamvand Yiqiang Zhan State Key Laboratory of ASIC and System Centre of Micro-Nano SystemSISTFudan University200433ShanghaiChina department of physics Government Postgraduate College(Higher Education Department-HED)Khyber Pakhtunkhwa21300MansehraPakistan State Key Laboratory of Surface physics Key Laboratory of Micro-and Nano-PhotonicsFudan University200433ShanghaiChina Faculty of Engineering and Natural Sciences Tampere UniversityFI-33014TampereFinland KAUST Solar Center Division of Physical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900RiyadhKingdom of Saudi Arabia

Hot charge carriers(HC)are photoexcited electrons and holes that exist in nonequilibrium high-energy states of photoactive *** cooling time and rapid extraction are the current challenges for the development of future innovative HC-based optoelectronic devices,such as HC solar cells(HCSCs),hot energy transistors(HETs),HC photocatalytic reactors,and lasing *** on a thorough analysis of the basic mechanisms of HC generation,thermalization,and cooling dynamics,this review outlines the various possible strategies to delay the HC cooling as well as to speed up their *** materials with slow cooling behavior,including perovskites and other semiconductors,are thoroughly *** addition,the opportunities for the generation of plasmon-induced HC through surface plasmon resonance and their technological applications in hybrid nanostructures are discussed in *** judiciously designing the plasmonic nanostructures,the light coupling into the photoactive layer and its optical absorption can be greatly enhanced as well as the successful conversion of incident photons to HC with tunable energies can also be ***,the future outlook of HC in optoelectronics is highlighted which will provide great insight to the research community.

关键词： optoelectronic charge plenty

On the Validity of the Effective Index Method for Long Period Grating Photonic Crystal Fibers

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Materials Sciences and Applications 2012年第5期3卷 310-316页

作者： Dhia Khadri Walid Belhadj Douha Gamra Fathi AbdelMalek Habib Bouchriha department of physics Jazan University Jazan Kingdom of Saudi Arabia Ecole Polytechnique de Montreal Genie Physique Montreal Canada Faculté des Sciences de Bizerte Bizerte Tunisia Laboratoire de Physique Quantique et Photonique Faculte des Sciences de Tunis Tunis Tunisia

This paper focuses on the investigation of modal characteristics and sensing properties of long period grating photonic crystal fibers (LPG-PCFs). An improved effective index method is employed with an objective to study its limitations for various designs of LPG-PCFs. Results so obtained with the above method are compared with the corresponding values of multiple multipole (MMP) method results which points the range of validity and applicability of the improved effective index method to LPG-PCFs. It is shown that this method is excellent when the surrounding media is assumed to be air. However, it becomes less accurate when the fiber is immersed into a liquid with a refractive index close to that of the cladding.

关键词： Long Period Gratings Photonic Crystal Fiber (LPG-PCF) Improved Effective Index MMP Cladding Modes Sensor Sensitivity

Indium doping effect on properties of ZnO nanoparticles synthesized by sol–gel method

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Chinese physics B 2019年第4期28卷 342-348页

作者： S Mourad J El Ghoul K Omri K Khirouni Laboratory of physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE) Faculty of Sciences in Gabes Gabes University Imam Mohammad Ibn Saud Islamic university (IMSIU) College of Sciences Department of Physics

Pure ZnO and indium-doped ZnO(In–ZO) nanoparticles with concentrations of In ranging from 0 to 5% are synthesized by a sol–gel processing technique. The structural and optical properties of ZnO and In–ZO nanoparticles are characterized by different techniques. The structural study confirms the presence of hexagonal wurtzite phase and indicates the incorporation of In^(3+) ions at the Zn^(2+) sites. However, the optical study shows a high absorption in the UV range and an important reflectance in the visible range. The optical band gap of In–ZnO sample varies between 3.16 e V and 3.22 e V. The photoluminescence(PL) analysis reveals that two emission peaks appear: one is located at 381 nm corresponding to the near-band-edge(NBE) and the other is observed in the green region. The aim of this work is to study the effect of indium doping on the structural, morphological, and optical properties of ZnO nanoparticles.

关键词： In-doped ZnO nanoparticles sol–gel process structural and optical characterization

Ion Source Optimisation for Proton Beam Quality of the Van De Graaff Accelerator at iThemba LABS for Ion Beam Analysis

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World Journal of Nuclear Science and Technology 2013年第3期3卷 83-86页

作者： M. E. M. Eisa J. L. Conradie P. J. Celliers J. L. G. Delsink D. T. Fourie G. de Villiers K. A. Springhorn C. A. Pineda-Vargas Accelerator Group iThemba LABS Somerset West South Africa department of physics Northern Border University Arar Kingdom of Saudi Arabia department of physics Sudan University of Science and Technology Khartoum Sudan iThemba LABS Materials Research Department Somerset West South Africa iThemba LABS Materials Research Department Somerset West South Africa Faculty of Health and Wellness Sciences C.P.U.T Bellville South Africa

The operating principles of the two duoplasmatron ion sources and the PIG source available for the Van de Graaff accelerator have been determined qualitatively, mainly by studying the extensive literature on ion sources. The main characteristics of the three sources have therefore been determined experimentally on an ion source test bench. Important parameters of the sources such as the pressure and temperature in different regions of the sources not measured, because of space limitations. However, in spite of these limitations in quantitative understanding of the sources, sufficient information to continue with the study of the beam transport through the Van de Graaff accelerator and its beamlines could be obtained from these measurements. With regard to beam intensity, lifetime and gas consumption the measurements showed that the hotcathode duoplasmatron is at present by far the most suitable source for the van de Graaff accelerator. The emittance of the ion source was measured with two slits, 90 mm apart, and a Faraday cup in the ion source test bench at an arc voltage of 83 V, an arc current of 1 Amp, a filament voltage of 24 V and an extraction voltage of 5 kV. The measured emittance for 90% of the beam intensity is 48π mm mrad. This figure will be used to calculate the beam transmission through the Van de Graaf accelerator. Different computer programs have been used for these calculations from the ion source through the terminal section, the accelerator and beam line up to the Nuclear Microprobe (NMP) for beam quality.

关键词： Van De Graaff Beam Optics Ion Source

Hot Air Generator Using Natural Convection Flow in a Heated Channel

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Journal of Energy and Power Engineering 2019年第4期13卷 131-136页

作者： Bushra alGarawi Zeinebou Yahya department of physics Faculty of SciencesQassim UniversityBuraidah 51452Kingdom of Saudi Arabia

Hot air producing is one of the most important engineering applications in recent *** is a technique used in various thermodynamic systems,such as home heating systems,food *** of the main problems impeding the spread of hot air producing technology is the lack of homogeneity of the heat flow coming from hot air generators as well as an inadequate flow *** most of the existing hot air generators require to be supported by systems that can increase the low volumetric flow and the air temperature of these generators,through increasing the speed of the flow of air emitted or lifting the drawer Heat,which contributes to raising the overall ***,to improve the thermal and dynamic quality of the hot air flow produced by the generator,a numerical investigation of the free convection flow inside two different configurations is presented in this *** primary objective of this work is to predict the behavior of the flow inside tow configurations,the first one consists of a vertical cylinder with heated walls,and the second configuration is an open-ended vertical cylinder with a hot disc placed at the entrance(configuration A,configuration B).This work characterizes through the examination of this flow,the variables that control an air emission with high flow rate and a high and homogeneous temperature to represent the appropriate criteria that should be respected to obtain a hot air generator overcoming the previously mentioned ***;the results of this work show the influence the boundary conditions and Rayleigh number on the resulting flow.

关键词： Hot air generator natural convection vertical channel Navier-Stokes equations finite volume method

Physically Nonlinear Deformation of a Three-Layer Beam on Elastic Foundation

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材料科学与工程（中英文A版） 2014年第5期4卷 190-196页

作者： Atwa D. Zeyad department of physics Faculty of Scinces at Yanbu Taibah University Almadinah Almunawwarah Kingdom of Saudi Arabia

Elastoplastic bending of a three-layer beam with rigid compressible filler on an elastic base has been studied. A system of equilibrium equations for displacements has been obtained and solved. The numerical results for a three-layer metal-polymer-metal beam are cited. The graphs displacements, strains and stresses, depending on the rigidity of the elastic foundation. To describe kinematics of asymmetrical across thickness pack in the bearing layers the Bernoulli hypotheses have been accepted. Displacements in the filler vary linearly over thickness. The reaction of the base is described by Winkler"s model.

关键词：弹性地基非线性变形 Winkler 金属聚合物物理梁弹塑性弯曲平衡方程

Room-temperature multiple ligands-tailored SnO_(2) quantum dots endow in situ dual-interface binding for upscaling efficient perovskite photovoltaics with high V_(OC)

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Light(Science & Applications) 2021年第12期10卷 2467-2481页

作者： Zhiwei Ren Kuan Liu Hanlin Hu Xuyun Guo Yajun Gao Patrick W.K.Fong Qiong Liang Hua Tang Jiaming Huang Hengkai Zhang Minchao Qin Li Cui Hrisheekesh Thachoth Chandran Dong Shen Ming-Fai Lo Annie Ng Charles Surya Minhua Shao Chun-Sing Lee Xinhui Lu Frédéric Laquai Ye Zhu Gang Li department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)Guangdong-Hong Kong-Macao(GHM)Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina department of Electrical and Computer Engineering Nazarbayev UniversityNur-SultanKazakhstan The Hong Kong Polytechnic university Shenzhen Research Institute Shenzhen 518057China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic7098 Liuxian BoulevardShenzhen 518055China department of Applied physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina King Abdullah university of Science and Technology(KAUST) KAUST Solar Center(KSC)Physical Sciences and Engineering Division(PSE)Material Science and Engineering Program(MSE)Thuwal 23955-6900Kingdom of Saudi Arabia department of physics The Chinese University of Hong KongShatin 999077 Hong KongChina Center of Super-Diamond and Advanced Films(COSDAF) Department of ChemistryCity University of Hong KongHong KongChina

The benchmark tin oxide(SnO_(2))electron transporting layers(ETLs)have enabled remarkable progress in planar perovskite solar cell(PSCs).However,the energy loss is still a challenge due to the lack of“hidden interface”*** report a novel ligand-tailored ultrafine SnO_(2) quantum dots(QDs)via a facile rapid room temperature ***,the ligand-tailored SnO_(2) QDs ETL with multi-functional terminal groups in situ refines the buried interfaces with both the perovskite and transparent electrode via enhanced interface binding and perovskite *** novel ETLs induce synergistic effects of physical and chemical interfacial modulation and preferred perovskite crystallization-directing,delivering reduced interface defects,suppressed non-radiative recombination and elongated charge carrier *** conversion efficiency(PCE)of 23.02%(0.04 cm^(2))and 21.6%(0.98 cm^(2),V_(OC) loss:0.336 V)have been achieved for the blade-coated PSCs(1.54 eV E_(g))with our new ETLs,representing a record for SnO_(2) based blade-coated ***,a substantially enhanced PCE(V_(OC))from 20.4%(1.15 V)to 22.8%(1.24 V,90 mV higher V_(OC),0.04 cm^(2) device)in the blade-coated 1.61 eV PSCs system,via replacing the benchmark commercial colloidal SnO_(2) with our new ETLs.

关键词： perovskite interface quantum