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Surface Morphology and Magnetic Properties of Isolated Cylindrical Nickel Nanowires
Issue:
Volume 3, Issue 3, September 2017
Pages:
30-38
Received:
10 May 2017
Accepted:
5 June 2017
Published:
4 July 2017
Abstract: In this article, the surface morphology and magnetic properties of isolated cylindrical nickel (Ni) nanowires fabricated by electrodeposition have been thoroughly investigated using scanning electron microscopy and Magneto-Optical Kerr Effect (MOKE) magnetometry, respectively. The surfaces of most nanowires were found to be homogenous, uniform, and cylindrical in shape. Some others show different diameters and surface features, including; protrusions and branches along their length. The diameter distribution of a wide range of nanowires was found to differ from their template pore diameters. These all variations are more likely due to defects exist in the internal surfaces of the pores within the template itself, or may be associated with the trapped air pockets within the pores during nanowires growth or due to the oxide formation or residual contaminants which may cover these wires. The nanowires lengths were found to differ from their actual lengths estimated during deposition growth. This was attributed to the breakage of nanowires into small sections during releasing process. The hysteresis loops obtained by applying a magnetic field at different angles with respect to the nanowires long axis showed square hysteresis loops with a sharp jump of Kerr signal during switching behaviour, as well as a high squareness ratio, indicating the dominance of shape anisotropy. These results are quite different from the measurements of high density templated nanowires reported in the literature, due to the small number of nearest neighbour nanowires, and hence no magneto-static interaction. The magnetisation reversal of such wires is well described by the non-uniform rotation of the curling model of domain reversal.
Abstract: In this article, the surface morphology and magnetic properties of isolated cylindrical nickel (Ni) nanowires fabricated by electrodeposition have been thoroughly investigated using scanning electron microscopy and Magneto-Optical Kerr Effect (MOKE) magnetometry, respectively. The surfaces of most nanowires were found to be homogenous, uniform, and...
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Fully Crystallized Silicon Nanostructured Film Prepared at Low Temperatures by Plasma-Enhanced Chemical Vapor Deposition
Dmitry Evgenyevich Milovzorov
Issue:
Volume 3, Issue 3, September 2017
Pages:
39-46
Received:
14 May 2017
Accepted:
6 June 2017
Published:
14 July 2017
Abstract: I studied the nanocrystalline silicon thin films by means of photoluminescent spectroscopy, Raman spectroscopy and Fourier-transformed infrared spectroscopy technique. The chemical bonding properties was studied by using the Fourier-transformed infrared spectroscopy in the range from500 cm-1 to 2300 cm-1. Spectral peak at wave number of 1100 cm-1 is related to the Si-O-Si bonding configuration. Hydrogenation of film can be estimated by using spectral lines at 2100 cm-1 and 2080 cm-1. The Si-O dipoles which are located into silicon film play great role because of electron affinity for oxygen. Photoluminescent (PL) properties are significant for the films which were made by using hydrogenation of silicon. Fourier-transformed infrared spectra of film’s absorption show the changes in chemicals in the film: from the oxygen incorporation into silicon to the elimination the Si-O bonding by adding the silicon tetra fluoride into electrochemical reactor, and increasing the Si-F density of bonds. The dissociation of SiF4 molecule causes the appearance of fluorine on the film surface, but the hydrogen atoms react with fluorine and excess fluorine is removed. By increase of SiF4 flow rate, the Si-O-Si bridges were etched by HF acid. The size effect in PL from nanocrystalline silicon film can be explained by means of statistical method. We suggested that the ƒ(x) is distribution function of crystallites in their sizes, θ(x) is a quantum efficiency of nanocrystals. Accordingly, the quantity of emitted hydrogenizednanocrystals by band-to-band radiative transitions is important to estimate the PL linear optical response. The processing of grown hydrogeneited silicon nanocrystalline film by annealing and etching the oxides results in preparation of fully crystallized silicon film for manufacturingthe photonic devices with significant quantum yield.
Abstract: I studied the nanocrystalline silicon thin films by means of photoluminescent spectroscopy, Raman spectroscopy and Fourier-transformed infrared spectroscopy technique. The chemical bonding properties was studied by using the Fourier-transformed infrared spectroscopy in the range from500 cm-1 to 2300 cm-1. Spectral peak at wave number of 1100 cm-1 i...
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Optimization of Optical Nanoantenna Based on Structures Chiral Photonic Crystal
Mezache Zinelabiddine,
Seghaouil Samir,
Chaibi Walid,
Benabdelaziz Fatiha
Issue:
Volume 3, Issue 3, September 2017
Pages:
47-52
Received:
11 May 2017
Accepted:
5 July 2017
Published:
16 August 2017
Abstract: A novel Optical nanoantenna based on chiral photonic crystals is studied via numerical simulation under environment COMSOL Multiphysics 5.0. We have shown new model of optical nanoantenna. Where this miniaturized antenna has great potential application in biomedical and nanotechnologies. Numerical results are given and discussed to confirm these characteristics.
Abstract: A novel Optical nanoantenna based on chiral photonic crystals is studied via numerical simulation under environment COMSOL Multiphysics 5.0. We have shown new model of optical nanoantenna. Where this miniaturized antenna has great potential application in biomedical and nanotechnologies. Numerical results are given and discussed to confirm these ch...
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Numerical Simulation of CuInSe2 (CIS) Thin Film Solar Cell with (ZnO, ZnO:F) Buffer Layers
T. Belal,
R. Tala-Ighil Zair,
F. Ghezal
Issue:
Volume 3, Issue 3, September 2017
Pages:
53-58
Received:
8 April 2017
Accepted:
14 August 2017
Published:
23 October 2017
Abstract: This study focuses on the solar cells based on CIS simulation with buffer layer zinc oxide (ZnO) and fluorine-doped zinc oxide (ZnO:F). ZnO is a multifunctional material with several applications in electronics and photovoltaics, with multiple possibilities of synthesis involve inexpensive methods. ZnO (ZnO:F) is a prominent candidate to be an alternative buffer layer to so-called toxic cadmium sulphide (CdS) in CIS based solar cells. A promising result has been achieved with an efficiency of 22% with Voc = 0.565 V, Jsc = 45 mA/cm2 and fill factor = 82% by using ZnO (ZnO:F) as a buffer layer. It is also found that the high efficiency of CIS absorber layer thickness is between 1500nm and 2000nm. Our results are in good agreement with those reported in the literature from experiments.
Abstract: This study focuses on the solar cells based on CIS simulation with buffer layer zinc oxide (ZnO) and fluorine-doped zinc oxide (ZnO:F). ZnO is a multifunctional material with several applications in electronics and photovoltaics, with multiple possibilities of synthesis involve inexpensive methods. ZnO (ZnO:F) is a prominent candidate to be an alte...
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Study the Effect of Solvent / Non-solvent on Polycarbonate
Raad S. Sabry,
Muntazer I. Al-mosawi
Issue:
Volume 3, Issue 3, September 2017
Pages:
59-62
Received:
20 March 2017
Accepted:
1 April 2017
Published:
23 October 2017
Abstract: A stable superhydrophobic PC surface was obtained by a simple phase separation method at room temperature. The water contact angle of the superhydrophobic PC surface is 156± 2°. FESEM image exhibited that the PC surface composed of flower-like shaped linked together centrally with branches offered roughness on the surface with a hierarchical micro/nano-binary formation. When the PC superhydrophobic surface was immersed in water with the temperatures ranging from 5°C to 45°C for 1 h to 15 days, the water contact angle remained higher than 150°.
Abstract: A stable superhydrophobic PC surface was obtained by a simple phase separation method at room temperature. The water contact angle of the superhydrophobic PC surface is 156± 2°. FESEM image exhibited that the PC surface composed of flower-like shaped linked together centrally with branches offered roughness on the surface with a hierarchical micro/...
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