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 24 for “"Chemical doping"”.
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Effect of phase transformations, chemical doping, and matrix constraint on the microstructural development of dicalcium-silicate
The factors controlling the monoclinic ($\beta$) to orthorhombic ($\gamma$) transformation of dicalcium silicate (Ca$\sb2$SiO$\sb4$) at about 490$\sp\circ$C have been studied. This transformation is of interest in portland cement technology because the low temperature $\gamma$ phase is unreactive …
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Strongly correlated electron behavior in transition metal intermetallics: enhanced thermoelectricity and quantum criticality in FeGa₃ and superconductivity in NiBi₃
… large n-type thermopower below room temperature. Chemical doping drastically changes physical properties and thermoelectric properties enhances by large percentage over the pure compounds. An important structural feature of FeGa3 is the fact that the four Fe atoms per unit cell exist as two Fe-Fe …
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Iron (III) Chloride doping of large-area chemical vapor deposition graphene
Chemical doping is an effective method of reducing the sheet resistance of graphene. This thesis aims to develop an effective method of doping large area Chemical Vapor Deposition (CVD) graphene using Iron (III) Chloride (FeCl 3). It is shown that evaporating FeCl3 can increase the carrier …
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Drosophila Melanogaster Oviposition and Toxicity Studies on a Chip
… This behaviour is affected by physical and chemical properties of the substrate, which have not been investigated precisely and parametrically with existing manual approaches. Current oviposition-based chemical screening studies using agar plates are inaccurate, labor-intensive, and …
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Colloidal Electronics
… two concepts - Autoperforation and Asymmetric Chemical Doping - as means to fabricate and power electronic circuit elements on top of colloidal particles. These advances allow us to build the first colloidal electronic system that perform autonomous functions integrating energy harvesting, …
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Computational studies of electronic structure of doped graphene
… and lasers. By utilizing single heteroatom chemical doping method or electric field-induced method, one can introduce a band gap, ranging from 0.1eV to 0.5eV, in graphene. A tunable bandgap is highly desirable because it would allow significant flexibility in the design and optimization of …
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Chemical crystallography at the interface of physics, chemistry, and in engineering: structure determination of highly correlated extended solids, main group compounds, coordination complexes, and bioceramics
… (Yb2Pd3Ga9), determining the influence of chemical doping on structure and physical properties (P-, Yb-, Co-, and Cu-doping of CaFe4As3 and Mn-doping of Sr3Ru2O7), elucidating the structure of transition metal corrole complexes to understand its regioselectivity of various substituents and …
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Graphene as transparent electrodes for solar cells
… of the science and engineering in applying chemical vapor deposition (CVD) graphene as the transparent conductor in photovoltaic devices. Transparent conducting oxides currently dominate the transparent conductor market but suffer drawbacks that make them unsuitable certain applications. …
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Controlling properties of functional oxides by tuning oxygen defect chemistry
… chemistry equilibria. These are heterogeneous chemical doping of the surface for improving surface electrocatalytic activity and stability, electrochemical bias to control phase with drastic changes obtained in electronic and phonon transport properties, as well as strain engineering to alter …
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Understanding electronic defects in organic solar cells: Defect identification, characterization & mitigation
… temperature processing, and easy tunability by chemical doping. Substantial progress has resulted from the optimization of materials processing parameters and the emergence of new materials. Recent works have achieved conversion efficiencies exceeding 13%, but with the Shockley-Queisser limit …
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Understanding emergence of supramolecular chirality in lyotropic conjugated polymers
… as charge carrier mobility and conductivity upon chemical doping. In Chapter 2, I explore the LC-mediated assemblies of conjugated polymers, uncovering a ubiquitous yet previously overlooked phenomenon: the spontaneous chiral emergence during the multistep assembly of achiral conjugated polymers, …
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Fast algorithm and surface integral equations for two-dimensional materials modeling
… of graphene can be tuned by the temperature, chemical doping or electrical gating. The near-field thermal radiation can be enhanced due to graphene plasmonics in the terahertz regime. Off resonance, the graphene coating has a shielding effect on the dielectric bodies containing …
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Chemical Correlation of Magnetic Permeability and Microwave Absorption in Spinel Ferrite Nanoparticles
… This dissertation explores the effect of chemical doping of nanoscale ferrites of 4 – 12 nm) on the complex permeability and ferromagnetic resonance (FMR) behavior. Size-dependent studies in MnFe₂O₄ and CoFe₂O₄ reveal that increasing particle size enhances both the real (μ′) and imaginary …
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High pressure effects on electron transport and structure of colossal magnetoresistive materials
… from Pr_{1-x}Ca_xMnO_3 system. The effects of chemical doping (bandwidth) and pressure are not equivalent in the high pressure range. This is unlike the results in the low pressure range acquired by other groups previously. A universal P* exists for samples with metal-insulator transitions.
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Structural and Magnetic Phases in Pressure-Tuned Quantum Materials
… which arise with similar techniques such as chemical doping. The properties of low-dimensional magnetic materials, and how these systems respond as they are pushed toward a more three-dimensional nature is explored through studies of both the crystal and magnetic structures of the family of …
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Synthesis And Characterization Of Transition Metal Arsenide Nanocrystals And The Metastability And Magneto-Structural Phase Transition Behavior Of Mnas Nanocrystals
… decrease in the particle size or the presence of chemical doping, or both. </p> <p>A new general synthetic method for transition metal arsenide (Ni11As8, FeAs and CoAs) nanocrystals synthesis was developed by directly injecting the metal precursor into pre-reacted arsenic precursors. This method …
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Polymer Light-Emitting Electrochemical Cells Enhanced with Bipolar Electrode Arrays: In Situ Doping and Formation of Multiple p-n Junctions
Polymer light-emitting electrochemical cells (PLECs) are organic solid-state light-emitting devices operating on in situ electrochemical doping and p-n junction formation in a mixed conductor active layer. PLECs have been extensively researched for their attractive device characteristics and …
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Electronic structure and energetics of Fe-based superconductors: Effects of chemical and magnetic disorder in (Ba-X)(Fe-Y)2As2
… The Fe-SC systems are amenable to controlled chemical doping/alloying, exhibiting coexistence of AFM and SC, as well as structural transformations versus temperature and pressure that lead to competing magnetic and structural defects. Because of this, exploration of the electronic structure of …
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Functional surface chemistry of carbon-based nanostructures
… exposed to ambient, introduction of defects and doping by chemical means is expected to be an effective route for addressing these issues. Raman spectroscopy has been a proven characterization method for understanding vibrational and even electronic structure of graphene, nanotubes, and graphite, …
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Static and Dynamic Disorder in Emerging Optoelectronic Materials
… PV applications. We then look into two chemically related Van der Waals materials, namely bismuth triiodide (BiI3) and bismuth oxyiodide (BiOI), that exhibit promising optoelectronic properties for PV applications. Here we use a combination of DFT and many-body theory together with …
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