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Articles 151 - 180 of 244

Full-Text Articles in Materials Science and Engineering

Synthesis Of Silver-Diamond Like Carbon Thin Films By Magnetron Sputtering, Venkatesh Majji Jan 2013

Synthesis Of Silver-Diamond Like Carbon Thin Films By Magnetron Sputtering, Venkatesh Majji

Material Science and Engineering Theses - Archive

Diamond-like carbon thin films are been used in wide range of applications due to their attractive tribological properties. Metal-doped DLC films have significant properties which make them compatible to use in larger variety of applications. The present study examines the dispersion and their effect on various tribological properties when Ag is incorporated into the DLC thin films. These Ag-DLC nanocomposite films were synthesized by a hybrid CVD and magnetron sputtering process in a discharge composed of CH4, and Ar atmosphere. These DLC and Ag-DLC films were characterized by Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy …

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Role Of Engine Age And Lubricant Chemistry On The Characteristics Of Egr Soot, Olusanmi Adeniji Adeniran Jan 2013

Role Of Engine Age And Lubricant Chemistry On The Characteristics Of Egr Soot, Olusanmi Adeniji Adeniran

Material Science and Engineering Theses - Archive

Exhaust products of Diesel Engines serves as an environmental hazard, and to curtail this problem a Tier 3 emission standard was introduced which involves change in engine designs and introduction of EGR systems in Diesel engines. EGR systems, however has the challenge of generating soot which are abrasive and are major causes of wear in Diesel engines. This work has studied the characteristics of EGR soot formed in different range of engine age and in different lubricant chemistries of Mineral and Synthetic based diesel Oils. It is found that lubricant degradation is encouraged by less efficient combustion as engine age …

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Cold Plasma Treatment Of Magnetic Nanoparticles, Ke Wang Jan 2013

Cold Plasma Treatment Of Magnetic Nanoparticles, Ke Wang

Material Science and Engineering Theses - Archive

This thesis investigates the application of cold plasma to remove the oleic acid bonded on magnetic nanoparticles: SmCo5 nanoflakes prepared via surfactant assisted high energy ball milling and CoFe2O4 nanoparticles prepared via chemical synthesis. Oleic acid molecules bonded on nanoparticles are in the carboxylate form which could not be washed away by organic solvents in ultrasonic bath; only free oleic acid molecules left on the nanoparticle surface after ball milling can be washed away through ultrasonic bath. High temperature annealing method works for removing oleic acid but nanoparticles would be damaged because of oxidation and decomposition.The RF cold plasma has …

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Compaction Physics Of Solid Additive Blends : A Thermal Properties Study, Amy Brown Jan 2013

Compaction Physics Of Solid Additive Blends : A Thermal Properties Study, Amy Brown

Material Science and Engineering Theses - Archive

Compacted solid additive blends have attracted the interest of the polymers industry due to their ability to improve processability. However, limited research has been performed to analyze the thermal properties that these additives have during pelletization.This research studies the reaction behavior of erucamide and silica, when in a pure and mixed form, with each other when thermal conductivity and frictional heating experiments are conducted. During the thermal conductivity study, it was found that pure erucamide had a thermal conductivity of 0.37 W/mK. The thermal conductivity of pure silica could not be found since silica will not compact to itself. Therefore, …

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Fabrication And Characterization Of Single Electron Device And Study Of Energy Filtering In Single Electron Transport, Liang-Chieh Ma Jan 2013

Fabrication And Characterization Of Single Electron Device And Study Of Energy Filtering In Single Electron Transport, Liang-Chieh Ma

Material Science and Engineering Dissertations - Archive

Single electron devices, in which transport of single electrons is precisely controlled, hold a great promise as important components of future electronic devices and sensors. However, technical challenges have prevented their implementations to practical electronic and sensing systems. First of all, the fabrication of single electron devices requires their components to be defined and arranged in nanoscale precision, a great challenge for a large-scale fabrication. Secondly, for room temperature operation, the single-electron charging energy should be much larger than the room-temperature thermal energy, ~25 meV, requiring use of extremely small Coulomb island, which is difficult to control. This has limited …

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Corrosion And Hydrogen Embrittlement Of Nanocrystalline Nickel, Tapas Desai Jan 2013

Corrosion And Hydrogen Embrittlement Of Nanocrystalline Nickel, Tapas Desai

Material Science and Engineering Theses - Archive

Nanocrystalline (nc) materials have attracted the interest of the scientific community because of their unique physical and mechanical properties. However, limited research has been performed to analyze their electrochemical behavior. The majority of research in the field of electrochemical and corrosion behavior exists for electrodeposited nanocrystalline metals.This research studies the behavior of sputter-deposited nc Nickel films in corrosive and hydrogen environment by potentiodynamic polarization and microindentation. The surface morphology and composition of the samples was examined by Scanning Electron Microscopy and Energy Dispersive X-Ray spectroscopy. Bulk Ni samples exhibit mild passivation in 3.5 % NaCl solution. The surface reveals a …

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Nano-Morphology Of Polymer Bulk Herojunctions Studied By Time-Resolved Synchrotron X-Ray Scattering, Soo Kim Jan 2013

Nano-Morphology Of Polymer Bulk Herojunctions Studied By Time-Resolved Synchrotron X-Ray Scattering, Soo Kim

Material Science and Engineering Dissertations - Archive

This study investigates the phase transformation of an active layer in organic photovoltaics (OPV) during film deposition and post thermal treatment as well as effects of phase transformation on OPV performance. For this purpose, small - and wide angle X-ray scattering technique (SAXS and WAXS) was applied to examine the phase separation mechanism at relevant fabrication condition of the highest OPV device performance. The poly(3-alkylthiophene)/[6,6]-phenyl-C61 butyric acid methylester (P3AT/PCBM) blend sample was employed in order to study phase transformation of the active layer systemically.Our exploration with SAXS and WAXS technique found that the polarity of the substrate, a solubility, and …

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Fabrication And Characterization Of Barium Titanate Thin Film On Polycrystalline Nickel Substrate, Parisa Sahebi Jan 2013

Fabrication And Characterization Of Barium Titanate Thin Film On Polycrystalline Nickel Substrate, Parisa Sahebi

Material Science and Engineering Theses - Archive

Ferroelectric BaTiO₃(BTO) thin films were deposited on polycrystalline nickel disks and silicon wafer substrates by rf magnetron sputtering. Nickel oxide (NiO) and nanocrystalline nickel (nc-Ni) layers were used as interfacial buffer layers. Microstructural studies with X-ray diffraction and transmission electron microscopy reveal that the BTO films deposited at temperatures lower than 700℃ have an amorphous structure. However, the BTO films sputtered at temperatures higher than 700℃ are partially crystalline. BTO films have a good and continuous interface with both interfacial layers with no interdiffusion or reaction with the substrates. In the case of BTO deposition with nc-Ni interlayer at higher …

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Investigation On Thermo-Mechanical Instability Of Porous Low Dielectric Constant Materials, Emil Hyunbae Zin Dec 2012

Investigation On Thermo-Mechanical Instability Of Porous Low Dielectric Constant Materials, Emil Hyunbae Zin

Material Science and Engineering Dissertations - Archive

This study investigates the structural stability of porous low dielectric constant materials (PLK) under thermal and mechanical load and the influence of contributing factors including porosity as intrinsic factor and plasma damage and moisture absorption as extrinsic factors on thermo-mechanical instability of PLK in advanced Cu/PLK interconnects. For this purpose, a ball indentation creep test technique was developed to examine the thermal and mechanical instability of PLK at relevant load and temperature conditions in the interconnect structure. Our exploration with the ball indentation creep test found that PLK films plastically deforms with time, indicating that viscoplastic deformation does occur under …

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First-Principles Studies On N-Type And P-Type Doping In Cuprous Oxide, Qiong Bai Dec 2012

First-Principles Studies On N-Type And P-Type Doping In Cuprous Oxide, Qiong Bai

Material Science and Engineering Dissertations - Archive

We have performed studies on n-type and p-type cuprous oxide with and without doping by first principles methods. Generalized Gradient Approximation (GGA) is used for the geometry optimization. The total energy and the final electronic structure calculations are conducted using the nonlocal screened Heyd-Scuseria-Ernzerhof (HSE) hybrid density functionals approach for cuprous oxide. The HSE hybrid density functionals overcome the shortcoming of GGA, which gives a much reliable value of the band gap. The formation energies of native point defects in undoped cuprous oxide have been studied by HSE hybrid functional theory in two conditions, which are vacuum based condition and …

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Properties Of Concrete With Tire Derived Aggregate And Crumb Rubber As A Ligthweight Substitute For Mineral Aggregates In The Concrete Mix, Gideon Momanyi Siringi Dec 2012

Properties Of Concrete With Tire Derived Aggregate And Crumb Rubber As A Ligthweight Substitute For Mineral Aggregates In The Concrete Mix, Gideon Momanyi Siringi

Material Science and Engineering Dissertations - Archive

Scrap tires continue to be a nuisance to the environment and this research proposes one way of recycling them as a lightweight aggregate which can substitute for mineral aggregates in concrete. Aggregates derived from scrap tires are often referred to as Tire Derived Aggregate (TDA). First, the focus is how much mineral aggregate can be replaced by these waste tires and how the properties of concrete are affected with the introduction of rubber. This is being mindful of the fact that for a new material to be acceptable as an engineering material, its properties and behavior has to be well …

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Growth Mechanism And Interface Effects On Microstructure Of Perovskite-Type Barium Titanate-Based Epitaxial Films, Jie He Dec 2012

Growth Mechanism And Interface Effects On Microstructure Of Perovskite-Type Barium Titanate-Based Epitaxial Films, Jie He

Material Science and Engineering Dissertations - Archive

This work was motivated and focused on the growth mechanism, microstructures and interfaces of barium titanate, BaTiO3 (BTO), based epitaxial thin films. Transimission electron microscopy (TEM), high resolution TEM (HRTEM), electron diffraction (ED) have been mainly employed in this study for microstructure investigations of BTO-based epitaxial thin films with the assistance of other materials characterization methods, such as X-ray diffraction (XRD), atomic force microscopy (AFM), Nanoindentation testing, etc. As a basic studying model, epitaxial BTO films were first deposited on the (001) MgO substrate using RF magnetron sputtering to provide fundamental knowledge of the film growth for BTO based thin …

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Syntheses, Characterization, And Applications Of Injectable Citrate-Based Mussel-Inspired Biodegradable Adhesive (Icmba) Polymers And Hydrogels, Mohammadreza Mehdizadeh Dec 2012

Syntheses, Characterization, And Applications Of Injectable Citrate-Based Mussel-Inspired Biodegradable Adhesive (Icmba) Polymers And Hydrogels, Mohammadreza Mehdizadeh

Material Science and Engineering Dissertations - Archive

Tissue adhesives are increasingly gaining more popularity in various areas of biomedical applications. They are utilized as surgical adhesives, as a replacement or adjunct to conventional wound closure and bleeding control techniques such as suturing, as well as in other applications such as tissue engineering and drug delivery.Unfortunately, the existing surgical adhesives are not ideal for wet tissue adhesion required in many surgeries such as those for internal organs. Developing surgical adhesives with strong wet tissue adhesion, controlled degradability and mechanical properties, and excellent biocompatibility has been a significant challenge. Herein, learning from nature, we report a one-step synthesis of …

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Photoelectrochemical Activity Of Titanium Dioxide Thin Films, Aida Mehdinezhad Roshan Jan 2012

Photoelectrochemical Activity Of Titanium Dioxide Thin Films, Aida Mehdinezhad Roshan

Material Science and Engineering Theses - Archive

Titanium dioxide (TiO2) is considered as an oxide semiconductor with several unique properties, including environmental sensing capabilities, biocompatibility and photocurrent generation, long-term stability, cost efficiency, and chemical inertness. TiO2 thin films have a wide range of applications in dye-sensitized solar cells. TiO2 films have been deposited on two different substrates, aluminum and titanium. Two different methods used for deposition of the thin films namely: Plasma Electrolytic Oxidation (PEO) and Physical Vapor Deposition (PVD). In order to study the effect of roughness of the substrate on photocurrent generation of the deposited films, one group of substrates were “patterned” by Electrolytic Plasma …

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Computer Simulation, Fabrication And Characterization Of Inverse Frustum Nanosphere Metal Arrays For Fiber-Based Plasmonic Sensors, Jiaqi Wu Jan 2012

Computer Simulation, Fabrication And Characterization Of Inverse Frustum Nanosphere Metal Arrays For Fiber-Based Plasmonic Sensors, Jiaqi Wu

Material Science and Engineering Theses - Archive

In recent years, a number of metal nanostructures have attracted huge attention from scientists and researchers for its plasmonic property and surface enhanced Raman scattering effect. They have been utilized to monitor molecule adsorption, antibody-antigen reorganization event, and to enhance scattering for identification of molecules even in very low concentration. They both have also been exploited for real time biosensing.In this thesis, we are investigating a new plasmonic structure, inverse frustum nanosphere gold arrays, and exploring its optical fiber-based sensing application. The nanostructure was fabricated by electro-deposition of gold into pre-assembled templates, which are made of monodispered colloidal polystyrene nanospheres …

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Cuinse2: Electronic Activities Of Grain Boundaries And Solar Cell Fabrication Studies, Mehmet Eray Erkan Jan 2012

Cuinse2: Electronic Activities Of Grain Boundaries And Solar Cell Fabrication Studies, Mehmet Eray Erkan

Material Science and Engineering Dissertations - Archive

This dissertation is composed of three studies related to chalcopyrite solar cells. The first study is on electronic activities of grain boundaries (GBs) in CuInSe2 (CIS). Despite being polycrystalline, chalcopyrite thin film solar cells have reached record power conversion efficiencies. This is against the classical understanding on the effect of GBs in semiconductor materials. Because GBs are expected to be recombination centers and barriers against the carrier flow, reducing the device efficiency. Therefore, a complete understanding on the electronic behavior of chalcopyrite GBs is missing. Moreover, the high efficiency chalcopyrite solar cells are grown with Na impurities which positively …

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Wear And Tribofilm Formation With Zinc-Free Antiwear Additives, Pradip Sairam Pichumani Jan 2012

Wear And Tribofilm Formation With Zinc-Free Antiwear Additives, Pradip Sairam Pichumani

Material Science and Engineering Theses - Archive

Engine oil is used in all internal combustion engines to lubricate the moving parts & mitigate the wear due to friction. Along with the mentioned two functions, engine oil also serves to protect the engine from corrosion, clean debris, improves sealing and serves in thermal conductivity. Engine oil is either derived from petroleum derivatives or made synthetically. A number of additives are added to the engine oil (Base oil) to improve its performance and longevity. Antioxidants, pour point depressants, viscosity index improvers, antifoaming agents, corrosion inhibitors, etc are some of the additives that are added to improve the engine oil‘s …

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Effect Of Additive Morphology & Chemistry On Wear & Friction Of Greases Under Spectrum Loading, Sujay Dilip Bagi Jan 2012

Effect Of Additive Morphology & Chemistry On Wear & Friction Of Greases Under Spectrum Loading, Sujay Dilip Bagi

Material Science and Engineering Theses - Archive

The primary focus of grease development is to minimize friction and improve on wear and load bearing capacity. Traditional method to evaluate wear behavior of grease is based on ASTM D2266 which evaluates the performance of grease at 75°C, 40Kg and 1200 rpm for 1 hour. However, actual applications may require bearings to be subjected to spectrum loading conditions where-in rotations per minute (rpm), load and duration of test are variables. A series of six tests were conducted for all the grease blends; load was treated as the variable in four of the tests while maintaining the frequency constant and …

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Fundamental Understanding Of Soot Induced Wear Mechanism Of Diesel Engines, Mihir Patel Dec 2011

Fundamental Understanding Of Soot Induced Wear Mechanism Of Diesel Engines, Mihir Patel

Material Science and Engineering Dissertations - Archive

Emission of Oxides of nitrogen and particulates matters from diesel engines have been reduced by implementing exhaust gas recirculation (EGR) protocols but at the expense of increased wear of engine components. This problem is aggravated by Environment Protection Agency (EPA) regulation such as API CJ 4 and SAPS where chemical limits have been places on the amount of phosphorous, sulfur and sulfated ash in lubrication oil. Several studies have examined the role played by diesel soot on enhanced wear but none have provided comprehensive mechanism. This would allow the possibility to comprehend fundamental understanding of soot induced wear mechanism of …

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Templated Synthesis And Characterizations Of High Moment Magnetic Nanoparticles For Bioapplications, Punnapob Punnakitikashem Dec 2011

Templated Synthesis And Characterizations Of High Moment Magnetic Nanoparticles For Bioapplications, Punnapob Punnakitikashem

Material Science and Engineering Dissertations - Archive

Magnetic nanoparticles have been widely used for biomedical applications such as drug and gene delivery, hyperthermia treatment of cancer, MRI contrast enhancement, cell labeling and magnetic separation. We present two new types of magnetic nanoparticles for bioapplications; granular superparamagnetic gold nanoparticles and multilayered nanodisks. Granular superparamagnetic gold nanoparticles consist of superparamagnetic islands embedded in a gold matrix. Multilayered nanodisks consist of two magnetic layers separated by a non-magnetic layer with two capping layers. Capping layers such as gold provide functionalization sites for biomolecule attachment. These nanoparticles possess two key magnetic requirements for bioapplications, a high saturation magnetic moment and a …

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An Innovative Epitaxial Growth Method For Minimizing Dislocations In Thin-Film Quantum-Dot Optoelectronic And Photovoltaic Device Applications, Jateen Gandhi Dec 2011

An Innovative Epitaxial Growth Method For Minimizing Dislocations In Thin-Film Quantum-Dot Optoelectronic And Photovoltaic Device Applications, Jateen Gandhi

Material Science and Engineering Dissertations - Archive

A new buffer layer method for epitaxial growth of lattice-mismatched semiconductor quantum-dots based p-i-n structures is presented. To our knowledge this is the first instance of a dislocation-reduction approach that has shown reduced dark current behavior in a quantumdot device compared to its counterpart homojunction p-n device consisted of the barrier material. The present work compared a lattice misfit strain build-up behavior between an In0.15Ga0.85As (p) / InAs (i) / In0.15Ga0.85As (n) (QD) device to an In0.15Ga0.85As (p) / In0.15Ga0.85As (n) (HOM) device, as both were grown on an un-doped gallium arsenide (GaAs) (100) substrate. The intrinsic region of QD …

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Electrochemical N-Type Doping In Metal Oxides And Its Application In Photovoltaics, Xiaofei Han Dec 2011

Electrochemical N-Type Doping In Metal Oxides And Its Application In Photovoltaics, Xiaofei Han

Material Science and Engineering Dissertations - Archive

Electrodeposition has the advantages of low-cost, high-throughput and large-area processing which is particularly suitable for solar cells fabrication. Two common metal oxides prepared by electrodeposition are discussed here, ZnO and Cu2O. ZnO is largely used in the solar cells as the window and transparent contact material. Cu2O is potential absorption material for next generation solar cell. n-type doping of these metal oxides was revealed during electrochemical deposition. For naturally n-type ZnO, n-type doping is achieved by substituting the cation (Zn) with a group III element (Al, Ga and Y) and for naturally p-type Cu2O, n-type doping is realized by substituting …

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Extension Of A Progressive Failure, Energy Dissipation, Composite Tailoring Concept To A Healing Configuration, Shailesh Jayant Divey Jan 2011

Extension Of A Progressive Failure, Energy Dissipation, Composite Tailoring Concept To A Healing Configuration, Shailesh Jayant Divey

Material Science and Engineering Theses - Archive

A composite failure tailoring concept that results in a yield type response under tension has been proposed, modeled, and experimentally verified in prior research. The concept capitalizes upon a sequential, progressive failure of a set of redundant load paths of tailored strength and length. It has been shown in prior publications that the concept is functional and by comparison with experimental results that the analytical models of response developed are accurate. The limits of performance of the proposed tailoring concept have recently been investigated via a parametric study using one of the response models developed and significant improvements have been …

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Xanes And Ftir Study On Dried And Calcined Bones, Jayapradhi Rajendran Jan 2011

Xanes And Ftir Study On Dried And Calcined Bones, Jayapradhi Rajendran

Material Science and Engineering Theses - Archive

The animal bones are common archeological finds and are helpful in understanding the human past. The bones undergo transformation when they are calcined. The cooked and cremated bones undergo different transformation, because of their difference in their temperatures. Various techniques are employed to characterize the bone. In this study, XANES and FTIR are used to characterize the dried and calcined bones of different species. The calcined bones are prepared at two different temperatures, which helps in understanding the difference between the cooked and cremated bones. The objective of this research is to comprehend the chemical property of the bone material …

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Electrodeposition Of Nickel Sulfide And Its Thermal Oxidation For Photovoltaic Applications, Munteha Pac Jan 2011

Electrodeposition Of Nickel Sulfide And Its Thermal Oxidation For Photovoltaic Applications, Munteha Pac

Material Science and Engineering Theses - Archive

Alternative photovoltaic materials that feature natural abundance, low extraction and processing costs, and reasonable efficiency have to be found. In this respect, transition metal chalcogenides such as oxide and sulfide compounds of Ni; is studied because in addition to the features like abundance and cost, its electronic and optical properties vary dramatically by modifications in its stoichiometry. In addition to its low cost, and mature technology, electrochemical deposition method has many advantages over other methods since it allows direct deposition on conducting substrate and achieves good electrical contact and precise control of film thickness. Process of manufacturing Nickel Oxysulfide compound …

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Synthesis And Characterization Of Platinum Based Catalysts For Fuel Cells, Sonam Patel Jan 2011

Synthesis And Characterization Of Platinum Based Catalysts For Fuel Cells, Sonam Patel

Material Science and Engineering Theses - Archive

Platinum (Pt) and platinum alloys have attracted wide attention as catalysts to attain high performance to increase the power density and reduce the component cost of polymer electrolyte membrane fuel cells (PEMFCs). Extensive research has been conducted in the areas of new alloy development and understanding of mechanisms of electrochemical oxygen reduction reaction (ORR). The durability of PEMFCs is also a major barrier to the commercialization of these fuel cells. Recent studies have suggested that potential cycling can gradually lead to loss of active surface area due to Pt dissolution and nanoparticle grain growth [1]. In this thesis we report …

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Gold/ Copper Sulphide And Gold Nanoparticles For Application In Cancer Therapy, Santana Bala Lakshmanan Jan 2011

Gold/ Copper Sulphide And Gold Nanoparticles For Application In Cancer Therapy, Santana Bala Lakshmanan

Material Science and Engineering Theses - Archive

The main goal of this research is to use Gold/ Copper Sulphide (Au/ CuS) and Gold nanoparticles (AuNPs) for improving the therapeutic effects in the treatment of cancer. One of the biggest successes in photothermal therapy is the use of AuNPs which however has its own drawbacks i.e. it is expensive and that the NIR absorption of Au nanostructures is from surface plasmon resonance which is dependent on the dielectric constant of the surrounding matrix. Thus, the plasmon absorption maxima would shift for in-vivo observations compared to in-vitro. Alternatively, Copper Sulphide (CuS) nanoparticles, developed recently, have also been used for …

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Pulsatile Protein Release From A Thermoresponsive Hydrogel: Effect Of Device Architecture, Nanoparticle And Polymer Concentration Using Factorial Analyses, Shruti Gandhi Jan 2011

Pulsatile Protein Release From A Thermoresponsive Hydrogel: Effect Of Device Architecture, Nanoparticle And Polymer Concentration Using Factorial Analyses, Shruti Gandhi

Material Science and Engineering Theses - Archive

A pulsatile thermo-responsive drug delivery device for wound healing applications was developed in this study and its drug release during 24 hours of thermal cycling was characterized. The device consisted of a temperature sensitive hydrogel of poly (N-isopropyl acrylamide-co-acrylamide) (PNIPAM-AAm) nanoparticles (LCST: 39-40°C) embedded in a poly (ethylene glycol) diacrylate (PEGDA) matrix inside a device made of poly (methyl methacrylate). The device had four different orifice geometries all with the same surface area of opening (5 mm2): slit, cross, circle and four-circle. Bovine serum albumin (BSA) was loaded onto the hydrogel as the model protein. The effect of the orifice …

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Semi-Transparent Zno:Al/Cu2o Thin-Film Heterojunction Fabricated At Low Temperature: Effect Of An Intrinsic Zno Buffer Layer At The Junction, Yu-Nung Huang Jan 2011

Semi-Transparent Zno:Al/Cu2o Thin-Film Heterojunction Fabricated At Low Temperature: Effect Of An Intrinsic Zno Buffer Layer At The Junction, Yu-Nung Huang

Material Science and Engineering Theses - Archive

The Al-doped ZnO (AZO)/Cu2O semi-transparent heterojunction was realized by an RF sputtering at low temperature in this study. Specifically, the usage of a buffer layer in the junction structure has been found as a key factor influencing the carrier transport mechanisms and performance of the junction. First, the chemical bath deposition (CBD) has been utilized in depositing an intrinsic ZnO (i-ZnO) buffer layer in order to entirely avoid potential plasma damage from a subsequent sputter deposition process. Increasing pH of CBD solution was critical in delaying the formation of detrimental ZnOHx particles in the solution and the assistance of ultrasonication …

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Development Of Multimodal Imaging System Combined With Laser Microbeam For Nanoscale Manipulation And Characterization., Ninad Ingle Jan 2011

Development Of Multimodal Imaging System Combined With Laser Microbeam For Nanoscale Manipulation And Characterization., Ninad Ingle

Material Science and Engineering Theses - Archive

Optical microscopy has fascinated biologists for probing and observing cellular structure while performing scientific research. While numerous wide-field and scanning microscopic techniques are being developed for probing cellular structure and function with high spatial and temporal resolution, mapping of complete biochemical, material and structural properties of the cell in three dimensions requires integration of multiple microscopic imaging techniques. In this thesis, conventional phase contrast microscopy and epifluorescence microscopy techniques were combined with other imaging methods such as digital holography microscopy (DHM) also known as quantitative phase microscopy, atomic force microscopy (AFM), near-field scanning optical microscopy (NSOM), total internal reflection fluorescence …

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