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Articles 121 - 150 of 244

Full-Text Articles in Materials Science and Engineering

Magnetic-Plasmonic Multilayered Nanorods, Orathai Thumthan Dec 2015

Magnetic-Plasmonic Multilayered Nanorods, Orathai Thumthan

Material Science and Engineering Dissertations - Archive

Multilayered nanorods which consist of alternating magnetic layers separated by Au layers combine two distinctive properties, magnetic properties and surface plasmonic resonance (SPR) properties into one nano-entity. Their magnetic properties are tunable by changing the layer thickness, varying from single domain to superparamagnetic state. Superparamagnetic is a key requirement for magnetic nanoparticles for bioapplications. Superparamagnetic nanoparticles exhibit high magnetic moments at low applied magnetic field while retain no magnetic moments when magnetic field is removed preventing them from aggregation due to magnetic attraction. Au layers in the nanorods provide anchorage sites for functional group attachment. Also, Au nanodisks exhibit SPR …

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Comprehensive Study Of Composition Gradient Strontium Doped Lanthanum Manganite Thin Films Deposited By Magnetron Co-Sputtering, Yishu Wang Dec 2015

Comprehensive Study Of Composition Gradient Strontium Doped Lanthanum Manganite Thin Films Deposited By Magnetron Co-Sputtering, Yishu Wang

Material Science and Engineering Dissertations - Archive

In this body of work, the examination of three different types of Strontium doped lanthanum manganite thin films synthesized by magnetron sputtering in the Surface and Nano Engineering Laboratory (SaNEL) allowed for the development of a detailed understanding between the processing conditions, the nano-scale structure and strain relaxation of the as-deposited thin films. Pure Lanthanum manganite and strontium doped lanthanum manganite thin films which were epitaxially grown on (001) single crystalline lanthanum alumina (LAO) and magnesium oxide (MgO) were fabricated by using single target deposition. The optimum deposition conditions were explored as preparation for synthesis epitaxial composition gradient strontium doped …

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Guanidinium Based Anion Exchange Membranes For Solid Polymer Alkaline Fuel Cell Applications, Syed Dawar Sajjad Dec 2015

Guanidinium Based Anion Exchange Membranes For Solid Polymer Alkaline Fuel Cell Applications, Syed Dawar Sajjad

Material Science and Engineering Dissertations - Archive

Low temperature traditional PEM Fuel Cells and also other fuel cells in general suffer from the acute yet long standing issues of cost and performance. This has severely hindered the commercialization of fuel cells but Alkaline Anion Exchange Membrane Fuel Cells (AAEMFCs) pose as a breakthrough technology by offering improved conversion efficiency (a virtue of fast kinetics in the alkaline media) and the lower costs (from the prospect of using non-noble metal catalysts). However, before systematic testing of non-noble metal catalysis is tested on this system, it is imperative to develop a reliable anion exchange membrane which lies at the …

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Interface Reaction Induced Stress Development In An Aluminum Thin Film Copper Bulk Plate Diffusion Couple, Michael Codie Mishler Dec 2015

Interface Reaction Induced Stress Development In An Aluminum Thin Film Copper Bulk Plate Diffusion Couple, Michael Codie Mishler

Material Science and Engineering Theses - Archive

This thesis investigates the mechanism of the interface reaction induced intermetallic phase formation (IMC) and its impact on the interface reliability in Al-Cu diffusion couple pairing. This study is motivated by the accelerated failure experiments in lead frame to integrated circuit (IC) package wire-bonds using copper (Cu) wire and aluminum (Al) bond-pad that have shown failure most often occurs at the interface of the intermetallic compound (IMC) γ2-phase (Cu9Al4). In order for simulative investigation, we created a diffusion couple consisting of Cu bulk plate coated pure Al thin films with thickness of ~2µm. This configuration is adapted to resemble the …

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Influence Of The Volume-Contact Area Ration On The Growth Behavior Of The Cu-Sn Intermetallic Phase, Venkatakamakshi Supraja Giddaluri Dec 2015

Influence Of The Volume-Contact Area Ration On The Growth Behavior Of The Cu-Sn Intermetallic Phase, Venkatakamakshi Supraja Giddaluri

Material Science and Engineering Theses - Archive

Solder Joints play a very important role in electronic packaging industry by serving as mechanical support and provides integrity to the device. The increasing demand for high performance, environmental and economic feasibility and miniaturization led to the development of high density interconnects. With the reduction in the size/stand off height of the solder is the reliability issues in the surface mount assemblies and packaging structures under various rigorous environments. One of the most important impact factors that affect the solder joint reliability is the growth rate IMC formed between the solder and substrate. IMC formation is required to ensure good …

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Solution Processed Optical Coatings For Solar Cell Applications, Rajesh Tummala Dec 2015

Solution Processed Optical Coatings For Solar Cell Applications, Rajesh Tummala

Material Science and Engineering Theses - Archive

In the recent past the demand for higher energy conversion efficiency of solar cells is on the rise. Extensive research is carrying out and many new methods have been proposed by changing either fabrication process or implementation of anti-reflection coatings. In this thesis, the solution processed omni directional anti-reflection coatings have been demonstrated on commercial amorphous silicon solar cells and on fabricated organic solar cells. A simple convective coating technique is utilized to deposit spherical silica micro-particles on the commercial amorphous silicon solar cells and on fabricated organic solar cells. In order to investigate the behavior of solar cells at …

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Nanoparticle-Bridge Assay For Amplification-Free Electrical Detection Of Oligonucleotides, Manouchehr Teimouri Dec 2015

Nanoparticle-Bridge Assay For Amplification-Free Electrical Detection Of Oligonucleotides, Manouchehr Teimouri

Material Science and Engineering Dissertations - Archive

The aim of this research is to investigate a highly sensitive, fast, inexpensive, and field-applicable amplification-free nanoparticle-based oligonucleotide detection method which does not rely on any enzymatic or signal amplification process. In this approach, target oligonucleotide strands are detected through the formation of nanoparticle satellites which make an electrical path between two electrodes. This method enables an extremely sensitive oligonucleotide detection because even a few oligonucleotide strands can form a single nanoparticle satellite which can solely generates an electrical output signal. Results showed that this oligonucleotide detection method can detect oligonucleotide single strands at concentrations as low as 50 femtomolar …

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Material Changes Of Bone Following Ishcemia Of The Immature Femoral Head, Olumide O. Aruwajoye Dec 2015

Material Changes Of Bone Following Ishcemia Of The Immature Femoral Head, Olumide O. Aruwajoye

Material Science and Engineering Dissertations - Archive

Legg-Calvé-Perthes disease (LCPD) is a childhood hip disorder resulting from the loss of blood flow to the femoral head. In severe cases of the disease, the femoral head can develop a flattening deformity; additionally, if the disease is diagnosed at a later stage, it leaves most patients to develop early osteoarthritis of the hip. Due to a lack of pathological specimen from patients, an experimental piglet model of femoral head ischemia was developed. The model closely follows the radiographic changes seen in LCPD patients, where there is subchondral fracture, resorption, and a flattening deformity of the femoral head. After ischemia, …

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Mechanical Reliability Of Porous Low-K Dielectrics For Advanced Interconnect: Study Of The Instability Mechanisms In Porous Low-K Dielectrics And Their Mediation Through Inert Plasma Induced Re-Polymerization Of The Backbone Structure, Yoonki Sa Dec 2015

Mechanical Reliability Of Porous Low-K Dielectrics For Advanced Interconnect: Study Of The Instability Mechanisms In Porous Low-K Dielectrics And Their Mediation Through Inert Plasma Induced Re-Polymerization Of The Backbone Structure, Yoonki Sa

Material Science and Engineering Dissertations - Archive

Continuous scaling down of critical dimensions in interconnect structures requires the use of ultralow dielectric constant (k) films as interlayer dielectrics to reduce resistance-capacitance delays. Porous carbon-doped silicon oxide (p-SiCOH) dielectrics have been the leading approach to produce these ultralow-k materials. However, embedding of porosity into dielectric layer necessarily decreases the mechanical reliability and increases its susceptibility to adsorption of potentially deleterious chemical species during device fabrication process. Among those, exposure of porous-SiCOH low-k (PLK) dielectrics to oxidizing plasma environment causes the increase in dielectric constant and their vulnerability to mechanical instability of PLKs due to the loss of methyl …

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Enhanced Mechanical Stability Of Interlayer Dielectrics With Self-Organized Molecular Pores, Akanksha Pandey Jan 2015

Enhanced Mechanical Stability Of Interlayer Dielectrics With Self-Organized Molecular Pores, Akanksha Pandey

Material Science and Engineering Theses - Archive

In order to reduce resistance-capacitance delays in interconnect structures, ultralow-k films are used as interlayer dielectric materials. In most cases the preferred method to achieve the lower dielectric constant is the use of porous carbon doped silicon oxide (p-SiCOH) dielectrics. A downside of porosity in a dielectric layer during device fabrication is that it reduces the mechanical reliability of the dielectric and increases the susceptibility to adsorption of damaging materials. To overcome this and produce a material which can sustain the rigorous processes of fabrication, it is necessary to optimize the mechanical, thermal and chemical properties along with the electrical …

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Enhanced Photocatalytic Performance Of Titania Nanobelts Decorated With Gold Particles Synthesized Using Stirring-Assisted Hydrothermal Method, Yi Shen Jan 2015

Enhanced Photocatalytic Performance Of Titania Nanobelts Decorated With Gold Particles Synthesized Using Stirring-Assisted Hydrothermal Method, Yi Shen

Material Science and Engineering Theses - Archive

In this thesis, anatase TiO2 nanobelts (TNBs) have been successfully obtained via an optimized stirring-assisted hydrothermal synthesis. The impact of stirring speed has been studied. Difference in morphology caused by stirring speed was observed by high resolution Field-Emission SEM (FE-SEM). Methylene Blue degradation test indicated that at certain stirring speed, i.e., 700 rpm, which was the highest, produced the best photoactivity than commercial P25 TiO2.Furthermore, Au decorated TNBs were obtained by a simple reduction reaction with Au-containing precursor. The Au-TNBs were founded to outperform in MB degradation the commercial P25 TiO2 and the pristine TNBs under both UV and visible …

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Organic/Inorganic Guanidinium-Based Hybrid Anion Exchange Membranes For Alkaline Fuel Cells, Shambhavi Raju Sakri Jan 2015

Organic/Inorganic Guanidinium-Based Hybrid Anion Exchange Membranes For Alkaline Fuel Cells, Shambhavi Raju Sakri

Material Science and Engineering Theses - Archive

Organic-inorganic hybrid membranes are good alternatives to homogeneous ones to overcome the limitations posed by the individual constituent materials. These membranes pose promising applications in fuel cells with the combination of phenomenal functionality of organic polymers and stability of inorganic material. Introduction of inorganic materials into the polymer matrix is usually known to show an increase in mechanical properties of the membrane while, the organic part of the membrane, i.e., the polymer contributes towards the electrochemical properties. The properties of the individual materials combine to enhance the characteristic properties of the hybrid membranes. In this thesis we attempted to develop …

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Characterization Of Fracture Toughness In Amorphous Diamond Like Carbon Thin Films And Coatings, Ronaksinh Parmar Jan 2015

Characterization Of Fracture Toughness In Amorphous Diamond Like Carbon Thin Films And Coatings, Ronaksinh Parmar

Material Science and Engineering Theses - Archive

Any material containing a crack when subjected to a certain amount of load, will eventually fail. This failure of material can be either time consuming (ductile) or instant (brittle) depending on the type of material and amount of load applied. For one to be able to study fracture toughness, it is important to study the material's failure rate and how long it can withstand load without failure once a crack has been initiated. Ductile materials demonstrate high fracture toughness while brittle materials show lower fracture toughness and fail instantly once a crack has been initiated. Characterization of fracture toughness in …

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The Effects Of Deposition Conditions On The Mechanical Properties Of Titanium Silicon Nitride Nanocomposite Coatings, Suo Liu Jan 2015

The Effects Of Deposition Conditions On The Mechanical Properties Of Titanium Silicon Nitride Nanocomposite Coatings, Suo Liu

Material Science and Engineering Theses - Archive

Titanium Silicon Nitride has received much attention in recent years for its theoretical super hardness and oxidation resistance at high temperature. In this work, the mechanical properties of TiSiN thin films including hardness, coefficient of friction, wear rate, wear mechanism were studied in detail using nanoindentation, pin-on-disk tribometer, optical profilometer, SEM and XPS. Four deposition conditions were varied to find the optimal conditions that produce the TiSiN film with the highest hardness and the best wear resistance. First, four substrate biases (100V, 200V, 300V, and 500V) were used, respectively. Then, different power (50W, 55W, 60W) and different N2 ratio (20%, …

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Study Of The Effect Of Ion Concentration, Ph, And Surface Charge On Single-Particle Placement, Kunhua Yu Jan 2015

Study Of The Effect Of Ion Concentration, Ph, And Surface Charge On Single-Particle Placement, Kunhua Yu

Material Science and Engineering Theses - Archive

Supervising Professor: Seong Jin Koh Single particle placement (SPP) in which nanoparticles are placed on exact substrate positions on a single particle level has drawn a lot of attention as it can be used as an effective tool for bottom-up fabrications of nanoscale systems. In SPP, single nanoparticles are electrically guided toward substrate target positions through electrostatic funneling mechanism and once a single nanoparticle is placed on a target position it prevents the other nanoparticles from approaching toward the substrate, leading to placement of exactly one nanoparticle on each target position. This thesis investigates the role of three key parameters …

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Study And Manipulation Of Electron Tunneling Through Quantum Dots, Pradeep Krishna Bhadrachalam Dec 2014

Study And Manipulation Of Electron Tunneling Through Quantum Dots, Pradeep Krishna Bhadrachalam

Material Science and Engineering Dissertations - Archive

Fermi-Dirac distribution is the fundamental property which governs the electron energy distribution in solids. At finite temperatures, Fermi-Dirac thermal smearing of electron energies limits the operation of many electronic, opto-electronic and spintronic devices. Examples include single electron transistors, quantum dot resonant tunnel diodes for single photon detection, and single electron turnstile devices. To overcome this intrinsic limitation of Fermi-Dirac thermal smearing, these devices have typically been operated at cryogenic temperatures. Room temperature operation of these devices could be realized, however, if the thermal smearing of electron energies could be suppressed. Until now, studies in the fields of electron-tunneling refrigerators and …

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Temperature-Dependence Of Stress-Related Phenomena, Rahmat Saptono Dec 2014

Temperature-Dependence Of Stress-Related Phenomena, Rahmat Saptono

Material Science and Engineering Dissertations - Archive

Efforts have been made to develop a simple but physically sound model. The model was specifically proposed to capture, explain, and estimate the temperature sensitivity and strengthening mechanism phenomena in small volume material with particular reference to the roles grain boundary and surface. Model-inspired phenomenology approach was applied to reveal the key mechanisms and find directions for a more complete constitutive model. The model was developed in the limited space where diffusion is insignificant. It was assumed that the plastic flow was predominantly governed by the thermally-activated process of dislocation glide overcoming barriers. Simple mathematical functions were formulated and evaluated …

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Experimental And Numerical Study Of Phase Transition Of Lifepo₄ Material In Lithium Ion Batteries, Md Noor E Alam Siddique Dec 2014

Experimental And Numerical Study Of Phase Transition Of Lifepo₄ Material In Lithium Ion Batteries, Md Noor E Alam Siddique

Material Science and Engineering Dissertations - Archive

Phase transition behavior of LiFePO4 material has been studied in this work. During electrochemical charge/discharge processes, LiFePO4 transforms into FePO4 and this electrochemically driven phase transition of the two-phase system results in a potential plateau in a battery discharge curve. Besides, battery performance, especially under high rates, depends critically on this two-phase transition. However, this phase transition mechanism in the LiFePO4 crystal structure has yet not been understood in details. Developing better understanding is essential for designing high performing, safe and stable batteries.Currently available phase transition models for LiFePO4, such as the classical `core-shrinking model' and recently the `domino cascade …

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A Study On The Effect Of Magnetic Field On The Corrosion Behavior Of Materials, Soundarya Pondichery Jan 2014

A Study On The Effect Of Magnetic Field On The Corrosion Behavior Of Materials, Soundarya Pondichery

Material Science and Engineering Theses - Archive

Corrosion causes deterioration of a material due to its environment. Corrosion control has been one of the biggest challenges in most industries since many years. There are various notable and unknown factors that influence the rate of corrosion of a certain material/environment system. Magnetic fields and their driven effects on an electrochemical system has been recently gained interest. Various magnetic field driven forces occurring in an electrolyte have been reported during an electrochemical reaction. Lorentz force driven convection in the electrolyte, known as MHD effect and paramagnetic gradient forces are reported to be the most effective. This research studies the …

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Interfacial Reaction Of Sn-Based Solder Joint In The Package System, Huandi Gu Jan 2014

Interfacial Reaction Of Sn-Based Solder Joint In The Package System, Huandi Gu

Material Science and Engineering Theses - Archive

Now a day in electronic industry, as the trend of requiring smaller package size with better electronic performance, lead-free solder joints are always required to decrease their sizes. As a result, the reliability of smaller size solder joints has became a critical issue. The primary factor causing the reliability issue of lead-free solder joints is intermetallic compound (IMCs) formation which forming during soldering process and thermal aging process and can significantly affect the mechanical properties of solder joint. In this study, two different size solder joints with same composition (SAC305 with 96.5%Sn, 3.0Ag, 0.5%Cu) are subjected to isothermal aging treatment …

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Characterization Of Tantalum Nitride Thin Films By Magnetron Sputtering, Anna Zaman Jan 2014

Characterization Of Tantalum Nitride Thin Films By Magnetron Sputtering, Anna Zaman

Material Science and Engineering Theses - Archive

Tantalum Nitride is chemically inert, oxidation resistant and hard. TaN finds its application as a protective coating on steel due to their excellent wear properties. It has become a very promising diffusion barrier material in Cu interconnect technology in microelectronics. TaN has not been analyzed as much as other transition metal nitrides like the TiN system because TaN exhibits various stable and metastable phases. The emergence of these phases and the different physical, chemical and mechanical properties depend on the growth technique and deposition conditions. TaN thin films were deposited using the magnetron PVD system in the SaNEL lab. The …

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Surface Modification Of Iron And Aluminum By Electrolytic Plasma Processing, Adam J. Smith Jan 2014

Surface Modification Of Iron And Aluminum By Electrolytic Plasma Processing, Adam J. Smith

Material Science and Engineering Dissertations - Archive

Electrolytic Plasma Processing (EPP) is an emerging, clean surface modification technology which is able to both clean and, depending on the circuit polarity, deposit either cationic or anionic species from an aqueous electrolyte. EPP offers several benefits including environmental cleanliness, high deposition rates, and a nanograined surface structure. The following work presents research conducted on EPP, including surface cleaning of Fe and deposition of Ni onto Fe and Al substrates. Investigations were made into the microstructure of the surface as well as the atomic compositions of the coating and coating/substrate interface. EPP cleaning was initially conducted in order to determine …

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Plasmonic Nanostructures For Surface-Enhanced Raman Spectroscopy, Ruiqian Jiang Jan 2014

Plasmonic Nanostructures For Surface-Enhanced Raman Spectroscopy, Ruiqian Jiang

Material Science and Engineering Theses - Archive

In the last three decades, a large number of different plasmonic nanostructures have attracted much attention due to their unique optical properties. Those plasmonic nanostructures include nanoparticles, nanoholes and metal nanovoids. They have been widely utilized in optical devices and sensors.When the plasmonic nanostructures interact with the electromagnetic wave and their surface plasmon frequency match with the light frequency, the electrons in plasmonic nanostructures will resonate with the same oscillation as incident light. In this case, the plasmonic nanostructures can absorb light and enhance the light scattering. Therefore, the plasmonic nanostructures can be used as substrate for surface-enhanced Raman spectroscopy …

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Development And Analysis Of Low Calcium Flyash Based Geopolymer For Structural Applications, Gaurav Nagalia Jan 2014

Development And Analysis Of Low Calcium Flyash Based Geopolymer For Structural Applications, Gaurav Nagalia

Material Science and Engineering Theses - Archive

Geopolymers are an innovative ceramic material composed of long chains and networks of inorganic molecules are being used as an alternative to conventional Portland cement for infrastructure construction, replacement of intersection and localized repairs. Some of the advantages of this material is due to its ultra-fast setting time, rapid strength development and the phenomenal reduction in carbon foot print as compared to Portland cement. However, this material is yet to be commercialized due to the variability in its mechanical strength when using flyash from different sources. In this study aluminosilicate geopolymers with different alkali oxides (feldspars) have been prepared by …

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Au-Based Core-Shell Nanoparticles For Direct Formic Acid Fuel Cells, Chiajen Hsu Dec 2013

Au-Based Core-Shell Nanoparticles For Direct Formic Acid Fuel Cells, Chiajen Hsu

Material Science and Engineering Dissertations - Archive

Unique Au/Pd core-shell nanoparticles were synthesized via galvanic replacement of Cu by Pd on hollow Au nanoparticles. Au/PtCu core-shell nanoparticles were also synthesized using this method. These core-shell nanoparticles exhibited unique electrochemical properties - the Au/Pd nanoparticles demonstrated superior electrochemical activity for formic acid oxidation and the Au/PtCu nanoparticles improved the kinetics in oxygen reduction reaction, when compared to their corresponding pure metal particles. In this dissertation, we aim at investigating catalytic abilities of these core-shell nanoparticles and understanding electrochemical reactions in direct formic acid fuel cells.Different Pd thicknesses on hollow Au nanoparticles in the core-shell configuration have been investigated. …

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Grain Structure Evolution Of Tin-Based Lead-Free Solder Joints In Electronic Packaging Assembly And Its Impact On The Fatigue Reliability, Huili Xu Dec 2013

Grain Structure Evolution Of Tin-Based Lead-Free Solder Joints In Electronic Packaging Assembly And Its Impact On The Fatigue Reliability, Huili Xu

Material Science and Engineering Dissertations - Archive

Solder is one of the main joints materials used in the electronics for decades of years. It is not only the mechanical support but also conducts the electric signals in the electronics. However, the regulation of lead content in electronic devices has driven the transition from lead-tin solder to the lead-free solder that requires lots of research to fill the knowledge gap in the lead-free solder property. At the same time, the reliability issues due to solder failure are of great interest as the miniaturization and mobilization trend of the electronic devices continues. A lot of works have been done …

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Bubble Template Synthesis Of Hollow Gold Nanoparticle, Chivarat Muangphat Dec 2013

Bubble Template Synthesis Of Hollow Gold Nanoparticle, Chivarat Muangphat

Material Science and Engineering Dissertations - Archive

Recently, a new synthesis method for creating hollow gold nanoparticles by using electrochemically hydrogen nanobubbles as a template was discovered in our research group. Hollow gold nanoparticles with well-controlled, tunable dimension and morphology can be synthesized using various synthesis conditions. Such hollow gold nanoparticles exhibit unique optical properties that can be tuned by changing the nanoparticle structures. The objective of this study is to understand the formation mechanism of hollow gold nanoparticles synthesized using bubble template synthesis method. The synthesis process can be divided into two main processes: the formation of hydrogen nanobubble and the reduction of gold ions on …

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The Effects Of Microstructure On The Mechanical Properties Of Hard Transition Metal Silicon Nitride Nanocomposite Coatings, Jessica Mooney Dec 2013

The Effects Of Microstructure On The Mechanical Properties Of Hard Transition Metal Silicon Nitride Nanocomposite Coatings, Jessica Mooney

Material Science and Engineering Dissertations - Archive

In this body of work, the examination of two different transition metal silicon nitride (MeSiN) systems using two different methods of physical vapor deposition (PVD) allowed for the development of a detailed understanding between the processing conditions, the micro-scale and nano-scale morphology, and the mechanical properties of the as-deposited thin film nanocomposite coatings. TiSiN coatings processed using the high-energy Arc deposition technique had hardness values of up to 33.6 GPa, and a previously unidentified (TiSi)N FCC crystalline phase, likely present due to the amounts of energy employed during coating processing, was discovered via intensive low angle X-Ray diffraction (XRD) and …

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Performance Qualification And Raman Investigation On Cell Behavior And Aging Of Lifepo₄ Cathodes In Lithium-Ion Batteries, Amir Salehi Jan 2013

Performance Qualification And Raman Investigation On Cell Behavior And Aging Of Lifepo₄ Cathodes In Lithium-Ion Batteries, Amir Salehi

Material Science and Engineering Theses - Archive

This thesis explores the ability of Raman spectroscopy to understand the complex chemistry taking place in LiFePO₄ cathodes of Li ion batteries. The performance of Li ion batteries was optimized through electrode fabrication and assembling procedures. Various amounts of Timcal Super P carbon were used to construct a conductive network of C-LiFePO₄ particles and the performance of the cathodes was examined during battery cycling. Raman spectroscopy along with electrochemical characterization such as charge/ discharge curves, electrochemical impedance spectroscopy and Cyclic Voltammetry was employed for detailed investigation of battery performance and aging. It is found that both quantity and quality of …

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Effects Of Surface Plasmon Excitations On Photoluminescence By Cdse/Zns Quantum Dots, Ankit Kumar Singh Jan 2013

Effects Of Surface Plasmon Excitations On Photoluminescence By Cdse/Zns Quantum Dots, Ankit Kumar Singh

Material Science and Engineering Theses - Archive

The influence of localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs) on the photoluminescence (PL) spectra of core/shell type CdSe/ZnS quantum dots (QDs) has been studied. Thin film samples of these QDs were deposited on glass slides, irradiated by 514 nm polarized beam from an Argon-ion laser, and PL spectra were measured using a high-resolution 1250M JY-Horiba spectrometer equipped with liquid-nitrogen cooled CCD detector. In the first set of experiments, PL spectra were measured on QDs and QDs-Au NPs mixture as a functions of the intensity of the 514 nm laser beam. In the second set of experiments, PL …

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