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Structure,morphology and electrical resistance of W_(x)N thin film synthesized by HFCVD method with various N_(2) contents

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Rare Metals 2020年第12期39卷 1440-1448页

作者： Somayeh Asgary Mohammad Reza Hantehzadeh mahmood ghoranneviss Arash Boochani s.asgary m.r.hantehzadehm.ghoranneviss*.1.boochaniplasmaphysics research centerscience and research branchislamic azad universitytehran 14665-678iran department of physics kermanshah branchislamic azaduniversitykermanshah ***iran

Tungsten nitride(W_(x)N)thin films with good crystalline structure,high quality and relatively low resistivity were deposited by hot filament chemical vapor deposition(HFCVD)technique at different mixtures of N2 and Ar *** data demonstrate that different N_(2) contents in gas mixture strongly affect microstructure,phase formation,texture morphology and resistivity of the W_(x)N *** to X-ray diffraction(XRD)patterns,the growth of tungsten nitride films promotes δ-WN phase for lower N_(2) contents in gas *** higher N_(2) contents,a phase transition is observed in the tungsten nitride *** hexagonal δ-WN and cubic β-W_(2)N phases coexist,and WN phase approximately disappears with N_(2) contents in the gas mixture *** electron microscope(SEM)images for deposited films at lower N_(2) contents in gas mixture indicate a definite dense columnar *** electrical resistivity results exhibit a significant drop for the W_(x)N thin films with N_(2) contents in the mixed gas *** changes in N_(2) content in gas mixture are found to be responsible for variation in the film resistivity ***,the deposited tungsten nitride thin film at higher N_(2) contents in gas mixture has noncolumnar microstructure and lower resistivity,which may be used as a superior diffusion barrier.

关键词： Tungsten nitride Thin film HFCVD Electrical resistivity Diffusion barriers

Effect of Electron Irradiation on Polypropylene Films

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Plasma Science and Technology 2011年第2期13卷 194-196页

作者： Sheila SHAHIDI Jakub WIENER mahmood ghoranneviss Abbas ANVARI Department of Textile Chemistry Faculty of Textile Technical University of Liberec Plasma Physics Research Center Science and Research Branch Islamic Azad University Departments of Physics Sharif University of Technology

Effects of both electron beam irradiation on the properties of polypropylene （PP） films and the irradiation on the different layers of a multilayer PP film are studied. A Fourier transform infrared spectroscope was used to investigate the chemical structure of the films. The results showed that the chemical properties of the first layer were improved, that is, more functional groups responsible for dye ability and hydrophilicity of the film were produced on its surface, while noticeable improvement was not detected on the surface of other layers. This was also confirmed by testing the dye ability of the layers. However, the results obtained by atomic force microscopy showed that the electron irradiation caused some topographical changes, not only on the surface of the first layer but also on the others.

关键词： polypropylene electron beam dye ability film

Excellent photocatalytic performance under visible-light irradiation of ZnS/rGO nanocomposites synthesized by a green method

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Frontiers of Materials Science 2016年第4期10卷 385-393页

作者： Hassan Rayat AZIMI mahmood ghoranneviss Seyed Mohammad ELAHI Mohammad Reza MAHMOUDIAN Farid JAMALI-SHEINI Ramin YOUSEFI Plasma Physics Research Center Science and Research Branch Islamic Azad University Tehran Iran Department of Chemistry Shahid Sherafat University of Farhangian 15916 Tehran Iran Advanced Surface Engineering and Nano Materials Research Center Department of Physics Ahvaz Branch Islamic Azad University Ahvaz Iran Department of Physics Masjed-Soleiman Branch isiamic Azad University Masjed-Soleiman Iran

ZnS/graphene nanocomposites with different graphene concentrations （5, 10 and 15 wt.%） were synthesized using L-cysteine as surfactant and graphene oxide （GO） powders as graphene source. Excellent performance for nanocomposites to remove methylene blue （MB） dye and hexavalent chromium （Cr（VI）） under visible-light illumina- tion was revealed. TEM images showed that ZnS NPs were decorated on GO sheets and the GO caused a significant decrease in the ZnS diameter size. XRD patterns, XPS and FTIR spectroscopy results indicated that GO sheets changed into reduced graphene oxide （rGO） during the synthesis process. Photocurrent measurements under a visible- light source indicated a good chemical reaction between ZnS NPs and rGO sheets.

关键词： ZnS/rGO nanocomposites graphene photocatalytic performance watertreatment green nanotechnology

Effect of Low-Pressure Nitrogen DC Plasma Treatment on the Surface Properties of Biaxially Oriented Polypropylene, Poly (Methyl Methacrylate) and Polyvinyl Chloride Films

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Plasma Science and Technology 2013年第4期15卷 362-367页

作者： S. Hamideh MORTAZAVI mahmood ghoranneviss Soheil PILEHVAR Sina ESMAEILI Shamim ZARGHAM S. Ebrahim HASHEMI Hamzeh JODAT Plasma Physics Research Center Science and Research Branch Islamic Azad University Tehran Iran Polymer Engineering Group Composite Science and Technology Research CenterTehran Iran Plasma Physics Research Center Science and Research Branch Islamic Azad UniversityTehran Iran Polymer Engineering Center Science and Research Branch Islamic Azad UniversityTehran Iran Polymer Engineering Group Composite Science and Technology Research CenterTehran Iran

In this study, commercial biaxially oriented polypropylene （BOPP）, polyvinyl chlo- ride （PVC） and poly （methyl methacrylate）（PMMA） films were treated with nitrogen plasma over different exposure times in a Pyrex tube surrounded by a DC variable magnetic field. The chemi- cal changes that appeared on the surface of the samples were investigated using Fourier transform infrared （FT4R） spectroscopy and attenuated total reflectance Fourier transform infrared （ATR- FTIR） spectroscopy after treatment for 2 min, 4 min and 6 rain in a nitrogen plasma chamber. Effects of the plasma treatment on the surface topographies and contact angles of the untreated and plasma treated films were also analyzed by atomic force microscopy （AFM） and a contact angle measuring system. The results show that the plasma treated films become more hydrophilic with an enhanced wettability due to the formation of some new polar groups on the surface of the treated films. Moreover, at higher exposure times, the total surface energy in all treated films increased while a reduction in contact angle occurred. The behavior of surface roughness in each sample was completely different at higher exposure times.

关键词： plasma surface treatment biaxially oriented polypropylene polyvinyl chlo-ride poly (methyl methacrylate) wettability