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 15 of 15 for “"X-ray Photoemission Spectroscopy"”.
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Characterisation of silicon nanoparticles produced by mechanical attrition using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoemission spectroscopy
The establishment of printing technologies, using nanoparticle based inks, promises inexpensive manufacture of electronic devices. However, to produce working devices, nanoparticles have to meet requirements on size, shape, and composition. In the application of silicon nanoparticles in …
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Semiconductor electronic band alignment at heterojunctions of wurtzite aluminum nitride, gallium nitride, and indium nitride
… GaN, and InN semiconductors are measured by x-ray photoemission spectroscopy. The bands alignments are all found to be Type I, and the valence-band discontinuities are found to be:(UNFORMATTED TABLE OR EQUATION FOLLOWS)$$\vbox{\halign{#\hfil&&\qquad #\hfil\cr &$\rm\Delta E\sb{v}$\ (eV)\cr\cr …
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Colloidal Cerium Oxide Nanoparticle: Synthesis and Characterization Techniques
… in only nonradiative transitions. The optical spectroscopy results show that the ceria samples have different ratios of Ce(III) ions to Ce(IV) ions, which is verified by x-ray photoemission spectroscopy (XPS).
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Investigations of the gallium nitride, aluminum nitride and indium nitride semiconductors: Structural, optical, electronic and interfacial properties
… and wurtzite GaN, AlN and InN were studied by x-ray photoemission spectroscopy (XPS) in an effort to determine their valence band structure. We report the various energies of the valence band density of states maxima as well as the ionicity gaps of each material. Wurtzite GaN/AlN and InN/AlN …
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Advancing the treatment of relativistic theory within the OLCAO package and with application to solar photovoltaic technologies
… Although experimental methods such as X-ray photoemission spectroscopy can be used to investigate the surface atomic and electronic structures of such materials (e.g., by observing core-level chemical shifts), theoretical support is vital for interpreting the measured data and for guiding …
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Ion effects on stability of carbon nanotubes dispersions and complex formation in polar solvents
… are compared to surface sensitive technique of X-ray photoemission spectroscopy. Another part of the work studies ion effects on the stability of carbon nanotube dispersions in N-methylpyrrolidone. By evidence of spectroscopy and transmission electron microscopy, it was found that inorganic ions …
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Microscopic Study of Structure, Chemical Composition and Local Conductivity of La2/3Sr1/3MnO3 Films
… precision by combining in-situ angle-resolved x-ray photoelectron spectroscopy (ARXPS), ex-situ scanning transmission electron microscopy (STEM), and electron energy loss spectroscopy (EELS). Substantial deviations in Sr doping concentrations from its bulk value are observed at both the interface …
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The control of metal-NiNGaAs and NiNAlAs interfaces by cryogenic processing.
… temperatures have been investigated using soft X-ray photoemission spectroscopy (SXPS) and Transmission Electron Microscopy (TEM).The results presented show that In metallisation of In[0.53]Ga[0.47]As(100) at room temperature results in a predominantly three dimensional mode of growth, accompanied …
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Micro fuel cell and nanoscale colloidal separation systems: design, fabrication, and characterization
… by using Time of Flight-Secondary Ion Mass Spectroscopy (ToF-SIMS) and X-ray Photoemission Spectroscopy (XPS), as well as the water desorption isotherm technique. These porous silicon membranes can influence developments of proton exchange membrane, self-assembled layer deposition, and micro …
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Structural studies of Copper Tetra-Tert-Butyl Phthalocyanine Langmuir-Blodgett and vacuum deposited films
… ran parallel to each other. Scanning Tunnelling Spectroscopy (STS) studies found that the Highest Occupzed Molecular Orbital (HOMO) zs a half-occupied MO of b1g symmetry with mired Cu 3d(x2-y2)and ligand 2p character. A study of the orientation and molecular ordering of the CurrBPc molecule in a …
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Spectroscopic and Electrical Characterization of SiO<sub>x</sub> and GaN Device Structures as a Function of Irradiation
… resolved depth resolved cathodoluminescence spectroscopy (DRCLS) and spectroscopic elipsometry confirmed a strong electron trap related to a-Si nanoclusters at 3.87 eV and nc-Si grains at 3.92 eV below the conduction band of SiO<sub>2</sub>, respectively. DRCLS after ionizing irradiation …
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All Inorganic Colloidal Perovskite Nanocrystals for Optoelectronic Applications
… detailed 1H nuclear magnetic resonance (NMR), X-ray photoemission spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM) measurements, I show that the cause for these effects is that higher-polarity antisolvents favour condensation reactions …
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In operando SEM for the accelerated exploration of nanomaterials and their scalable device integration
… Together with complementary operando X-ray photoemission spectroscopy, the oxidation reaction and in particular, the formation of oxidative etch pits is monitored in real-time. Importantly, a high-throughput experimental design is introduced, whereby individual tungsten disulfide domains …
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Understanding and controlling the reactivity of oxygen reduction and methanol oxidation electrocatalysts
… = 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show the electronic structure around the Fe center is the same for all three supports. Only the Fe porphyrin supported on XC72 exhibits a pH XC72 relative to the other supports, …
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THE ROLE OF NATIVE POINT DEFECTS AND SURFACE CHEMICAL REACTIONS IN THE FORMATION OF SCHOTTKY BARRIERS AND HIGH N-TYPE DOPING IN ZINC OXIDE
… complement of depth-resolved cathodoluminescence spectroscopy (DRCLS), atomic force microscopy (AFM), Kelvin probe force microscopy (KPFM), and surface photovoltage spectroscopy (SPS) to show that surface treatment and processing plays a significant role in the quality, stability, and efficiency …