Investigation of chemical wet-etch surface modification of Ga0.5In0.5P using photoluminescence , x-ray photoelectron spectroscopy, capacitance measurements, and photocurrent-voltage curves

1995 ◽  
Vol 99 (2) ◽  
pp. 744-749 ◽  
Author(s):  
Shyam S. Kocha ◽  
Mark W. Peterson ◽  
Art J. Nelson ◽  
Yossi Rosenwaks ◽  
Doug J. Arent ◽  
...  
Keyword(s):  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Capacitance Measurements ◽  
Wet Etch

scholarly journals X-ray photoelectron spectroscopy for resistance-capacitance measurements of surface structures

2005 ◽  
Vol 86 (18) ◽  
pp. 183110 ◽  
Author(s):  
Gulay Ertas ◽  
U. Korcan Demirok ◽  
Abdullah Atalar ◽  
Sefik Suzer
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Structures ◽  
X Ray ◽  
Capacitance Measurements

Surface Modification of Acrylonitrile Fibers and Membrane by Nitrilase from Escherichia Coli BL21 (DE3)/pET-Nit

2011 ◽  
Vol 175-176 ◽  
pp. 651-655 ◽  
Author(s):  
Li Li Feng ◽  
Jian Fei Zhang ◽  
Hui Luo ◽  
Zheng Li
Keyword(s):  
Escherichia Coli ◽  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Membrane Surface ◽  
Atomic Ratio ◽  
X Ray ◽  
Escherichia Coli Bl21 ◽  
Treated Fiber ◽  
Acrylic Fibers ◽  
Pan Fibers

The surface of polyacrylonitrile fibers and membrane were modified by nitrilase from Escherichia coli BL21 (DE3)/pET-Nit. Escherichia coli BL21(DE3)/pET-Nit was able to convert nitrile groups on PAN fibers and membrane to corresponding carboxylic acid as indicated by X-ray photoelectron spectroscopy (XPS). An increase of O/C atomic ratio on the fiber and membrane surface showed an increase in hydrophilicity and fabric-dyeing efficiency. Strength of treated fiber decreased by only 1.17%, because only surfacial nitrile groups of acrylic fibers were hydrolyzed by E.coli BL21(DE3)/pET-Nit.

scholarly journals Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1957 ◽  
Author(s):  
Xiaozhen He ◽  
Ilkka Rytöluoto ◽  
Rafal Anyszka ◽  
Amirhossein Mahtabani ◽  
Eetta Saarimäki ◽  
...  
Keyword(s):  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Plasma Polymerization ◽  
Silica Surface ◽  
Plasma Reactor ◽  
Charge Trapping ◽  
Plasma Modification ◽  
Modified Silica ◽  
Depolarization Current ◽  
X Ray

Novel nanocomposites for dielectric applications-based polypropylene/poly(ethylene-co-octene) (PP/POE) blends filled with nano silica are developed in the framework of the European ‘GRIDABLE’ project. A tailor-made low-pressure-plasma reactor was applied in this study for an organic surface modification of silica. Acetylene gas was used as the monomer for plasma polymerization in order to deposit a hydrocarbon layer onto the silica surface. The aim of this modification is to increase the compatibility between silica and the PP/POE blends matrix in order to improve the dispersion of the filler in the polymer matrix and to suppress the space charge accumulation by altering the charge trapping properties of these silica/PP/POE blends composites. The conditions for the deposition of the acetylene plasma-polymer onto the silica surface were optimized by analyzing the modification in terms of weight loss by thermogravimetry (TGA). X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray fluorescence spectroscopy (EDX) measurements confirmed the presence of hydrocarbon compounds on the silica surface after plasma modification. The acetylene plasma modified silica with the highest deposition level was selected to be incorporated into the PP/POE blends matrix. X-ray diffraction (XRD) showed that there is no new crystal phase formation in the PP/POE blends nanocomposites after addition of the acetylene plasma modified silica. Differential scanning calorimetry results (DSC) show two melting peaks and two crystallization peaks of the PP/POE blends nanocomposites corresponding to the PP and POE domains. The improved dispersion of the silica after acetylene plasma modification in the PP/POE blends matrix was shown by means of SEM–EDX mapping. Thermally stimulated depolarization current (TSDC) measurements confirm that addition of the acetylene plasma modified silica affects the charge trapping density and decreases the amount of injected charges into PP/POE blends nanocomposites. This work shows that acetylene plasma modification of the silica surface is a promising route to tune charge trapping properties of PP/POE blend-based nanocomposites.

scholarly journals Band Gap Implications on Nano-TiO2 Surface Modification with Ascorbic Acid for Visible Light-Active Polypropylene Coated Photocatalyst

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 599 ◽  
Author(s):  
Chiara D’Amato ◽  
Rita Giovannetti ◽  
Marco Zannotti ◽  
Elena Rommozzi ◽  
Marco Minicucci ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Surface Modification ◽  
Visible Light ◽  
Band Gap ◽  
Tio2 Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Nano Tio2 ◽  
Alizarin Red ◽  
X Ray ◽  
Visible Light Active

The effect of surface modification using ascorbic acid as a surface modifier of nano-TiO2 heterogeneous photocatalyst was studied. The preparation of supported photocatalyst was made by a specific paste containing ascorbic acid modified TiO2 nanoparticles used to cover Polypropylene as a support material. The obtained heterogeneous photocatalyst was thoroughly characterized (scanning electron microscope (SEM), RAMAN, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and Diffuse Reflectance Spectra (DRS) and successfully applied in the visible light photodegradation of Alizarin Red S in water solutions. In particular, this new supported TiO2 photocatalyst showed a change in the adsorption mechanism of dye with respect to that of only TiO2 due to the surface properties. In addition, an improvement of photocatalytic performances in the visible light photodegration was obtained, showing a strict correlation between efficiency and energy band gap values, evidencing the favorable surface modification of TiO2 nanoparticles.

scholarly journals Surface Modification of Self-Consolidated Microporous Ti Implant Compacts Fabricated by Electro-Discharge-Sintering in Air

2017 ◽  
Vol 62 (2) ◽  
pp. 1287-1291 ◽  
Author(s):  
Y.J. Jo ◽  
Y.H. Yoon ◽  
Y.H. Kim ◽  
S.Y. Chang ◽  
J.Y. Kim ◽  
...  
Keyword(s):  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Single Pulse ◽  
Surface Characteristics ◽  
Solid Core ◽  
Air Oxidation ◽  
Microporous Layer ◽  
X Ray

AbstractA single pulse of 0.75-2.0 kJ/0.7g of atomized spherical Ti powders from 300 mF capacitor was applied to produce a microporous Ti implant compact by electro-discharge-sintering (EDS). A solid core in the middle of the compact surrounded by a microporous layer was found. X-ray photoelectron spectroscopy was employed to study the surface characteristics of the EDS Ti compact and it revealed that Ti, C and O were the main constituents on the surface with a smaller amount of N. The surface was lightly oxidized and was primarily in the form of TiO2resulting from the air oxidation during EDS processing. The lightly oxidized surface of the EDS compact also exhibited Ti nitrides such as TiN and TiON, which revealed that the reaction between air constituents and the Ti powders even in times as short as 128 msec.

Effect of Carbon Fibers’ Surface Modification on the In Situ Growth of Carbon Nanotubes

2012 ◽  
Vol 512-515 ◽  
pp. 761-764
Author(s):  
Jian Bao Hu ◽  
Shao Ming Dong ◽  
Xiang Yu Zhang ◽  
Zhi Hui Hu ◽  
Bo Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Metal Uptake ◽  
Chemical Properties ◽  
X Ray ◽  
Pretreatment Time ◽  
Physicochemical Methods

Surface modification of carbon fibers(CF) by physicochemical methods directs an attractive approach for improvement of metal uptake from solutions. We investigated pretreatment of carbon fibers by HNO3 with different time on absorption of catalysts, which is related to the coverage of carbon nanotubes (CNTs) grown on Carbon fibers. The effects of surface modifications on the properties of carbon fibers were studied by X-Ray photoelectron spectroscopy. The modifications bring about variation in the chemical properties. The modification increased a large number of surface functional groups such as hydroxyl and carbonyl. The HNO3 modification increases the catalysts absorption. The coverage of CNTs on CF increases with pretreatment time, which was studied by SEM.

Research in Surface Modification and Anti-Fouling of Polypropylene Porous Membrane

2013 ◽  
Vol 634-638 ◽  
pp. 353-356
Author(s):  
Chao Lin Miao ◽  
Hui Wang
Keyword(s):  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Membrane Surface ◽  
Porous Membrane ◽  
Grafting Polymerization ◽  
X Ray ◽  
Force Microscopy ◽  
Polypropylene Membrane ◽  
Atomic Force ◽  
Scanning Electron

Surface modification of microporous polypropylene membrane was performed by grafting polymerization of acrylamide.The morphological and microstructure changes of the membrane surface were confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy. The results indicate that the pore size of the grafted membrane was reduced.

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