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 19 of 19 for “"Electron Hopping"”.
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Self-assembled thin polymer film used for sensing application
… characterized and applied as a template for electron transfer efficiency determination. The surface COOH group in nanoporous thin films derived from PS-b-PMMA were modified with ferrocene redox moieties having different linker lengths in the organic phase. The surface functionalization …
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Coupled Electromechanical Peridynamics Modeling of Strain and Damage Sensing in Carbon Nanotube Reinforced Polymer Nanocomposites
… the nanoscale where the non-local phenomenon of electron hopping plays a significant role in establishing the properties of the nanocomposite along with CNT network formation and inherent piezoresistivity of CNTs themselves. Electron hopping or tunneling allows for a current to flow between …
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Computational Micromechanics Analysis of Deformation and Damage Sensing in Carbon Nanotube Based Nanocomposites
… are explored starting from the nanoscale electron hopping mechanism to effective macroscale piezoresistive response through finite elements based computational micromechanics techniques. The evolution of nanoscale conductive electron hopping pathways which leads to nanocomposite …
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Magnetite Oxidation in Aqueous Systems
… produced higher absorptivities of FeII-FeIII electron hopping transitions, while decreasing the absorptivity of FeIII-FeIII in the NIR and UV-regions respectively. Lower temperatures produced the opposite effects on the iron oxides' transitions. Higher temperature increased the rate of …
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The “Apparent” Diffusion Coefficient of Electrons Through a Nafion Membrane
… the current response are discussed, concluding electron-hopping is the most plausible mechanism for the case at hand. The Tedford Equation was formulated model the hydrodynamic current response in the membrane taking into account rotation rate dependence and the apparent diffusion of electrons …
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Electrical properties and defect structures of praseodymium-cerium oxide solid solutions
… In compositions containing 10% and 20% Pr, an electron hopping conductivity was observed at high pO02 values. This contribution was strongest at low temperatures and was attributed to the formation of a praseodymium impurity band within the CeO2 band gap. Defect association significantly …
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Visualization of energy transfer among redox active polymeric colloids via in-situ fluorescence microscopy
… colloids. Little is currently known about how electrons (energy) transfers either within or between redox active colloids (RAC). To elucidate this, contact-mediated electron transfer between these redox active colloids (RAC) was characterized via confocal microscope using the intrinsic redox …
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Renormalization-group theory of correlated electron systems
… theory to a variety of correlated electron systems, determining finite-temperature phase diagrams and thermodynamic properties for electron densities both at and away from half-filling. We begin by assessing the effectiveness of the Suzuki-Takano quantum decimation method on a d = 1 …
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Elektronen-Energieverlustspektroskopie von quasi-eindimensionalen Kupraten und Vanadaten
… and experimental investigation of the electronic structure of quasi one-dimensional cuprates and vanadates. Electron energy-loss spectroscopy in transmission was employed to measure the momentum-dependent loss function of Li2CuO2, CuGeO3, V2O5 and NaV2O5. The comparison between the …
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Characterizing the role of defects on the sensing performance of carbon nanotube and graphene based gas sensors
… utility as sensors. It will be demonstrated that electron flows in the carbon nanotube above the Poole-Frenkel conduction threshold can stimulate adsorbates to desorb without heating the sensor significantly. This desorption process is analogous to electron stimulated desorption, but with an …
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Synthesis and thermoelectric properties of Mg2Si-Mg2Sn solid solutions for waste heat recovery
… To understand the role of Mg vacancies on the electronic structure and transport properties, Mg2Si0.4Sn0.6 with various Mg deficiency and Sb doping levels have been synthesized and their transport properties have been investigated. The results suggest that Mg vacancies create localized hole …
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Synthesis and characterisation of metal oxides and metal doped variants
… from the non-equivalent sites as opposed to an electron hopping process. <br></br><br></br>The unit cell size of the metal-doped ferrite, Fe<sub>3-x</sub>Sn<sub>x</sub>O<sub>4</sub>, 0 < x < 0.4, has been shown by X-ray powder diffraction(XRD) to increase linearly as tin content increases. …
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SYNTHESIS, ELECTRONIC AND OPTO-ELECTRONIC TRANSPORT PROPERTIES OF ATOMICALLY THIN 2D LAYERS OF MoS2, WSe2 and CuIn7Se11
… materials show remarkable promise for future electronic and opto-electronics applications. The scope of this dissertation, thus, broadly covers the electronic and opto-electronic properties of such few layered 2D materials. Extensive investigation of electronic and opto-electronic transport …
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Ultrafast Dynamics of Flavin Cofactor in Photolyase/Cryptochrome Family
… the UV-induced pyrimidine dimer through a cylic electron transfer radical mechanism. The significant loss of repair efficiency by the mutation of the active-site residues indicates that those residues play a critical role in the DNA repair by photolyase. To understand how the protein active site …
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Direct visualization of electron transport among nonconjugated polymeric redox-active colloids via fluorescence microscopy
… fluorescence microscopy, to directly visualize electron transport processes among micron-sized redox active colloids (RAC) containing high densities of ethyl-viologen (EV) pendant groups. This observation was enabled by the discovery that these RAC exhibit a highly non-linear …
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Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens
… Silver nanoparticles support coherent electron oscillations, known as localized surface plasmons, at resonance frequencies that depend on the particle size and shape and the local dielectric environment. Nanoparticle absorption and scattering cross-sections are maximized at surface …
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Investigation of Charge Transfer in Metal-Organic Frameworks for Electrochemical Applications
… MOFs, charge transfer can happen through redox hopping, i.e. site-to-site electron hopping coupled to diffusion of counter ions to balance electroneutrality. While the apparent diffusion coefficient (Dapp) has been employed to describe the overall charge transfer efficiency, independent …
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Interfacial electroactive assemblies: from molecular electronics to biological applications
… 1.49 ± 0.25 x 10−11 mol.cm−2. The rate of electron transfer from the cobalt metal center to the electrode surface was found to be of the order of 1 x 105 s−1 by high speed chronoamperometry. Molecular junctions incorporating monolayers of ƴ-CD-(py)2, co-adsorbed with 1-nonanethiol have been …
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Hard Switched Robustness of Wide Bandgap Power Semiconductor Devices
… the literature; it is found to be related to the electron hopping along the defects in semiconductors generated in the switching tests. The comparison with the static acceleration tests reveals that both degradation mechanisms correlate to the high-bias switching transients rather than the …