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Dielectric and Magnetic Properties of nano-structure BiFeO<SUB>3</SUB>Doped with Different Concentrations of Co Ions Prepared by Sol-Gel Method

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New Journal of Glass and Ceramics 2015年第3期5卷 59-73页

作者： Inas Kamal Batttisha Ibrahim Sayed Ahmed Farag Mostafa Kamal Mohamed Ali Ahmed Emad Girgis Fawzi El Desouki Hesham Azmi El Meleegi Fawzi El Desouki National Research Centre (NRC) Solid State Physics Department 33 Bohouth St Dokki Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt National Research Centre (NRC) Thin Film Lab Electron Microscope Department 33 Bohouth St Dokki Giza Egypt

BiFe1-xCoxO3 (x = 0, 0.03, 0.05 and 0.1) symbolic as (BFO, BF3CO, BF5CO and BF10CO) in powder form has been prepared by sol-gel technique using ethylenediamine tetraacetic acid (EDTA) as a chelating agent. X-ray diffraction (XRD) and FTIR analysis showed rhombohedra distorted BiFeO3 structure with compressive lattice distortion induced by the Co substitution at Fe sites. The transmission electron microscope (TEM) shows irregular particles. The additive of cobalt oxide has led to grains refining giving the following crystallite sizes of 18 nm for BF5Co. The scanning electron microscope (SEM) study reveals that the samples morphology shows relatively uniform grain size distribution. The dielectric properties of BiFeO3 nano-particles in the frequency range of 1 up to 5 MHz at RT revealed that the A.C. conductivity of the prepared samples reaches its maximum value in BF5CO. By decreasing BiFeO3 particle size as a result of doping with different Co ion concentrations, an enhancement in magnetization and a simultaneous suppression in current leakage occurred. The remnant magnetization Mr of BiFe1-xCoxO3 (x = 0, 0.03, 0.05, 0.1) ceramics significantly enhanced, which provides potential applications in information storage.

关键词： nano-structure Multiferroic BiFe1-xCoxO3 (x = 0 0.03 0.05 0.1) XRD FTIR TEM Remnant Magnetization

FABRICATION AND CHARACTERIZATION OF ORGANIC THIN FILMS WITH nano-structure

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FABRICATION AND CHARACTERIZATION OF ORGANIC THIN FILMS WITH ...

中国真空学会五届三次理事会暨学术会议

作者： Takashi H Noritaka Y Chen Guorong Shin Horiuchi Norio Tanaka Tetsuo Moriya Photonics Research Institute National Institute of Advanced Industrial Science & Technology Midorigaoka 1-8-31 Ike-daOsaka 563-8577 Japan Fudan University 220 Handan Road Shanghai200433 China National Institute of Materials and Chemical Research 1-1-4 Higashi Tsukuba Ibaraki 305- 8565 Japan3 Dainichiseika Color & Chemi- cals Manufacturing Co. Ltd. 1-9-4 Horinouchi Adachi-ku Tokyo 123-8555 Japan Electrotechnical Laboratory 1-1-4 Umezono Tsukuba Ibaraki 305- 8568 Japan

A novel method of thin film formation of organic materials with nano-structure has been successfully developed by using vacuum technique is *** diarylethene(Ci8Hi8N2S2) was selected as a model compound for the evaluation of this method. Polymer film of PMMA, PBzMA, PHPM and PC were prepared for present experiment. By comparing these kinds of polymer, we found that the tendency of dye dispersion into the polymer is as follows:PC>PBzMA>PMMA>PHPMA, where no dispersion is observed for PHPMA under the condition of 115℃for 24 hours,Thin film of polymer alloy composed of PMMA and polystylene(PS)was loaded into a glass ample with diarylethene,and treated for three days at 100℃.Dispersed state of the dye was evaluated by transmission electron microscope, and concluded that the dye is distributed only in PS domains selectively. Photochromic properties of the PS domain will be evaluated by using a scanning nearfield optical microscope.

关键词： nano-structure Thin polymer film Scanning nearfield optical microscope (SNOM)

Self-assembled germanium nano-structures by laser-assisted oxidation

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Chinese Physics B 2006年第2期15卷 389-393页

作者：黄伟其刘杨荣 Department of Physics Guizhou University Guiyang 550026 China Institute of Geochemistry Chinese Academy of Sciences Guiyang 550003 China Department of Physics Guizhou Educational College Guiyang 550003 China Optoelectronics Physics Lab Gulzhou University Guiyang 550026 China

The investigation on the oxidation behaviour of Si1-xGex alloys （x=0.05, 0.15, and 0.25） is carried out. It is found for the first time that on the oxide film a germanium nano-cap with a thickness of 1.8-2.8nm and a few Ge nanoparticles with diameters ranging from 5.5 nm to 10 nm are formed by the *** laser-assisted dry oxidation of Si1-xGex substrate. A new scanning method on the decline cross-section of the multiple-layer sample is adopted to measure the layer thickness and the composition. Some new peaks in photoluminescence （PL） spectra are discovered, which could be related to the nano-cap and the nano-particles of germanium. A suitable model and several new calculating formulae with the unrestricted Hartree-Fock-Roothaan （UHFR） method and quantum confinement analysis are proposed to interpret the PL spectra and the nano-structure mechanism in the oxide.

关键词： low-temperature oxidation laser-assisted nano-structure PL spectra

nano-structures manufactured from crystal isomorphs consisted of [（CH3CH2）3NH)]2[WnMo1-nO2(C14H6O4)]

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Nano-structures manufactured from crystal isomorphs consiste...

中国化学会第五届全国多酸化学学术研讨会

作者： Zhang Bo Du Shizhen Lu xiaoming Wang Guo Department of Chemistry Capital Normal University

＜正＞We have synthesized three new crystal isomorphs consisted of complex [（CH3CH2）3NH)]2[W（n）Mo（1-n）O2（C14H6O4）2] （1:n=0;2: n=1;3: n= 0.25）;from which prepared noticeable different Mo/W-based organic hybrid nano-materials. The crystals all exhibited multi-layered structure by the pilling of lamellar repeating motifs through Van der waals forces, which are formed by the parallel alignment of 1D chains through hydrogen bonds, and the 1D

关键词： complex single crystal nano-structure

nano-structures prepared from single crystal and amorphous powder consisted of （NH3CH2CH2NH2）2[MoO2 (O2C10H6)2]

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Nano-structures prepared from single crystal and amorphous p...

中国化学会第五届全国多酸化学学术研讨会

作者： Zhang Bo Du Shizhen Lu xiaoming Department of Chemistry Capital Normal University

＜正＞Molybdenum complex （NH3CH2CH2NH2）2[MoO2（O2C10H6）2]·0.5CH3CN have been synthesized, bulk single crystal and macro amorphous powder consisted of the complex are produced respectively, and from which plate-lik... 详细信息

关键词： complex single crystal nano-structure

nano-structured Multi-layer SiGe Alloy Grown by Ultra High Vacuum Chemical Vapor Deposition

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Nano-structured Multi-layer SiGe Alloy Grown by Ultra High V...

2004 7th International Conference on Solid-State and Integrated Circuits Technology（ICSICT 2004）

作者： Zhizhen Ye,Guibin Wu,Jingyun Huang,Jifeng Cui,Weifeng Sun,Guojun Liu,Binghui Zhao, State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310027,China

The high quality single-layer and multi-layer nano-structured SiGe have been successfully grown on Si(100)substrates at low temperature by ultrahigh vacuum chemical vapor deposition system(UHV/CVD). The UHV/CVD system integrated three chambers into a whole and the growth chamber base pressure of 5.0×10Pa can be *** nano-structures of SiGe/Si were characterized using high-resolution X-ray diffraction(HRXRD)and cross-sectional transmission electron microscopy(XTEM).The results show good crystal quality and sharp *** demonstrates further crystal quality improvements of nano-structured SiGe alloy may be available in the application of microelectronics and optoelectronics.

关键词： nano-structure Multi-layer SiGe UHV/CVD

Enhancing Mechanical Stability of nano-structured Anti-Reflection Coatings

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Journal of Applied Mathematics and Physics 2020年第2期8卷 247-258页

作者： Behnam Kheyraddini Mousavi Tito Busani Mani Hossein Zadeh Steven Roy Julien Brueck Department of Electromechanical Engineering Northern New Mexico College Espanola USA Department of Electrical Engineering University of New Mexico Albuquerque USA

Periodic nanostructured anti-reflection coatings (NALs) are a promising option for enhancing transmission of coherent light without inducing scattering. We’ve found that reducing the height of NALs below a critical value to enhance mechanical stability can highly reduce the transmission efficiency. Here, using Rigorous Couples Wave Analysis (RCWA), we find the minimum height for over 99% transmission and effect of height on transmission bandwidth. Then, during a one-step plasma etching, two samples with different heights have been generated and their efficiency is evaluated using RCWA.

关键词： Maximum Transmission Mechanical Stability Reflection Laser nano-structure

Effect of Al Doping on Structural, Electrical, Optical and Photoluminescence Properties of nano-Structural ZnO Thin Films

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Journal of Materials Science & Technology 2012年第4期28卷 329-335页

作者： M. Mozibur Rahman M.K.R. Khan M. Rafiqul Islam M.A. Halim M. Shahjahan M.A. Hakim Dilip Kumar Saha Jasim Uddin Khan Department of Physics University of Rajshahi Rajshahi 6205 Bangladesh Materials Science Division Atomic Energy Centre Dhaka Bangladesh Industrial Physical Division BCSIR Dhaka Bangladesh

The nano-structural Al-doped ZnO thin films of different morphologies deposited on glass substrate were successfully fabricated at substrate temperature of 350 ℃ by an inexpensive spray pyrolysis method. The structural, electrical, optical and photoluminescence properties were investigated. X-ray diffraction study revealed the crystalline wurtzite （hexagonal） structure of the films with nano-grains. Scanning electron microscopy （SEM） micrographs indicated the formation of a large variety of nano-structures during film growth. The spectral absorption of the films occurred at the absorption edge of -410 nm. In the present study, the optical band gap energy 3.28 eV of ZnO decreased gradually to 3.05 eV for 4 mol% of AI doping. The deep level activation energy decreased and carrier concentrations increased substantially with increasing doping. Exciting with the energy 3.543 eV （A=350 nm）, a narrow and a broad characteristic photoluminescence peaks that correspond to the near band edge （NBE） and deep level emissions （DLE）, respectively emerged.

关键词： Thin film nano-structure ZnO Surface morphology Photolumlnescence

Finite element simulation of Love wave sensor for the detection of volatile organic gases

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Chinese Physics B 2022年第3期31卷 241-247页

作者： Yan Wang Su-Peng Liang Shu-Lin Shang Yong-Bing Xiao Yu-Xin Yuan College of Electronic and Optical Engineering & College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China

The three-dimensional(3D) finite element(FE) simulation and analysis of Love wave sensors based on polyisobutylene(PIB) layers/SiO_(2)/ST-90°X quartz structure are presented in this paper, as well as the investigation of coupled resonance effect on the acoustic properties of the devices. The mass sensitivity of the basic Love wave device with SiO_(2)guiding layers is solved analytically. And the highest mass sensitivity of 128 m^(2)/kg is obtained as h_(s)/λ = 0.175. The sensitivity of the Love wave sensors for sensing volatile organic compounds(VOCs) is greatly improved due to the presence of coupled resonance induced by the PIB nanorods on the device surface. The frequency shifts of the sensor corresponding to CH_(2)Cl_(2),CHCl_(3), CCl_(4), C_(2)Cl_(4), CH_(3)Cl and C_(2)HCl_(3) with the concentration of 100 ppm are 1.431 kHz, 5.507 kHz, 13.437 kHz,85.948 kHz, 0.127 kHz and 17.879 kHz, respectively. The viscoelasticity influence of the sensitive material on the characteristics of SAW sensors is also studied. By taking account of the viscoelasticity of the PIB layers, the sensitivities of the SAW sensors with the PIB film and PIB nanorods decay in different degree. The gas sensing property of the Love wave sensor with PIB nanorods is superior to that of the PIB films. Meanwhile, the Love wave sensors with PIB sensitive layers show good selectivity to C_(2)Cl_(4), making it an ideal selection for gas sensing applications.

关键词： gas sensor coupled resonance nano-structure Love wave