Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 71 for “"Oxygen Plasma"”.
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Reactive Plasma Etching of Silicon Carbide, Silicon Carbonitride, and Titanium Nitride in a Tetrafluoroethane/Oxygen Plasma
… (TiN) as our diffusion layer. Using the RF plasma and the magnetron gun with 1,1,1,2 tetrafluoroethane and oxygen as the active gases, we will obtain a reliable and reproducible method for determining the maximum etch rate for the various materials. An etch is required in order for a proper …
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Durability and Adhesion of a Model Epoxy Adhesive Bonded to Modified Silicon Substrates
… spectroscopy. The effectiveness of combining the oxygen plasma treatment and silane coupling agent (SCA) derivatization in adhesion promotion for an epoxy bonded to a silicon surface was evaluated in this research. SCAs with different amine functionalities were studied. The oxygen plasma treatment …
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Surface characterization and adhesive bonding of carbon fiber-reinforced composites
… ketone (MEK) wipe, peel ply, grit blast and gas plasma treatments were the pretreatments of interest. Chemical and physical changes which occurred in the cured composite surfaces following pretreatment were characterized with x-ray photoelectron spectroscopy (XPS), ion scattering spectroscopy …
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The influence of surface properties on carbon fiber/epoxy matrix interfacial adhesion
… Untreated, commercially surface treated and oxygen plasma treated PAN based carbon fibers were used for study. XPS was used to determine fiber surface chemistry. A two-liquid tensiometric method was conducted to determine fiber surface energy and its dispersion and polar components. SEM was …
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The role of surface pretreatment and surface analysis in the bondability of carbon fiber-polyimide matrix composites
… wash, gritblast, sulfuric acid soak, ammonia plasma, argon plasma, argon plasma followed by ammonia plasma, nitrogen plasma, and oxygen plasma. The pretreated surfaces were chemically characterized through the use of XPS (X-ray photoelectron spectroscopy), ISS (ion scattering spectroscopy), …
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An Investigation of Plasma Pretreatments and Plasma Polymerized Thin Films for Titanium/Polyimide Adhesion
Plasma pretreatments are environmentally benign and energy efficient processes for modifying the surface chemistry of materials. In an effort to improve the strength of the titanium alloy/FM-5 polyimide adhesive joint for aerospace applications, oxygen plasma pretreatments and novel thin plasma …
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STUDY OF GAS ADSORPTION ON AS-PRODUCED AND MODIFIED CARBON NANOTUBES
… Mutiwalled carbon nanotubes were exposed to oxygen plasma treatment for varying time periods. Afterwards, adsorption measurements of Methane (CH4) were conducted on untreated and oxygen plasma treated tubes. The presence of an additional substep, after exposing multiwalled carbon nanotubes to …
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Improvement in Adhesion for the Epoxy-SiC System via Plasma and Silane Surface Modification Techniques
… thesis addresses the advantages of employing plasma pretreatments and surface derivatization using silane coupling agents as surface modification techniques in an effort to enhance the adhesive bonding of epoxy to SiC coated Si wafers (SiC/Si). Durability was evaluated by immersing coated-Si …
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Investigation of doped cuprous halides for photovoltaic and display applications
… characterisation of the Zn doped n-type CuCl and oxygen doped p-type CuBr with higher carrier concentration using pulsed dc magnetron sputtering and thermal evaporation followed by oxygen plasma exposure, respectively. The structural and morphological properties of the n-type Zn doped CuCl films …
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Adhesion of novel high performance polymers to carbon fibers: fiber surface treatment, characterization, and microbond single fiber pull-out test
… carbon fiber was further modified using air, oxygen, ammonia, and ethylene plasmas. The AS-4 fiber tow was also characterized following exposure to the aqueous poly(amic acid) solution used to disperse the matrix powder during aqueous suspension prepregging of thermoplastic matrix composites. …
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Carbon nanotube assisted formation of sub-50 nm polymeric nano-structures
… polymer patterns were prepared by low energy oxygen plasma etching by using CNTs as the masks. The water soluble, amine-functionalized QDs underwent the nucleophilic acyl substitution reaction with the PSMa containing anhydride functional groups. This integration method is use to incorporate …
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Siloxane modified engineering polymers: synthesis and characteristics
… water uptake and much improved resistance to oxygen plasma degradation. XPS and SEM studies showed that the stabilization mechanism involved a siloxane to silicate transformation under an oxygen plasma environment.
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Understanding Formation and Transport of Amorphous Iron Oxyhydroxides in Porous Media using Microfluidic Flow Cells- a Novel Method to Study Freshwater Iron Cycling
… near neutral pH, ambient temperature and a sharp oxygen concentration which in turn has deep impact on the iron cycling and thus the fate of contaminants in the water column. We constructed an experimental micromodel that to observe key processes that affect biogeochemical iron cycling in the …
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Micron-scale flexible electronics for detection of reactive oxygen species for in vivo applications
… gold on a Kapton™ surface. Prior to deposition, oxygen plasma was used to planarize the Kapton surface for a smoother gold surface. Typical lithography procedures were used to pattern gold electrodes, yielding up to four electrodes. Delamination of gold from the binding layer was found minimized …
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Development of antenna-coupled metal-insulator-metal diodes for infrared detection
… using a two-step lithography process and an oxygen plasma oxidation. The device is characterized to both have current in the nA range and responsivities nearing 1000pA/W.
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Threshold voltage in pentacene field effect transistors with parylene dielectric
… Modification of the parylene surface using an oxygen plasma introduced traps at the semiconductor-dielectric interface, observable through a variety of characterization techniques. A model is developed to explain how the fixed and mobile charges these traps introduce influence the threshold …
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Effects of energetic irradiation on materials and devices based on graphene and topological insulators
… data exploring the effects of electron-beam and oxygen plasma induced disorder on the electronic properties and Raman spectra of graphene. These initial investigations were important for relating Raman peak intensities and weak localization features to each other and to an average disorder length …
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Design of band-engineered photocatalysts using TiO2
… controlled by treating the surface with remote oxygen plasma, changing the surface Fermi level by as much as 0.4 V through which the reaction rate constant varied by about 35%. Both trends are well-described by a quantitative one-dimensional model for photocurrent. The model suggests that …
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Development Of Single And Array Electro-Chemical Sensors For Real-Time Trace Metal Analysis In Aqueous Environmental Media
… of other species’ adsorption at surface oxygen groups. This stepwise functionalization approach served as a universal platform for elevating CFMs’ selectivity, while retaining sensitivity, response, stability, and lifetime.</p> <p>In parallel work, pyrolyzed photoresist film (PPF) …
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Grafeno ant skandžio oksido fotolitografija /
… which the monolayer was dry etched inside an oxygen plasma chamber to form a graphene microstructure. Another photoresist mask was formed so that a nickel-gold metal layer could be deposited on the surface. After the lift-off of the unnecessary leftover metal layer, the complete microstructure …
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