Sökning: "Superlattice"

Visar resultat 1 - 5 av 42 avhandlingar innehållade ordet Superlattice.

  1. 1. Functionalized Graphene as Superlattice and Gas Sensor

    Författare :Tianbo Duan; Klaus Leifer; Andrey Turchanin; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; graphene; functionalization; gas sensor; superlattice;

    Sammanfattning : Graphene, an atomic-thin carbon sheet with carbon atoms tightly packed honeycomb-like lattice, has attracted enormous interest due to its unique chemical and physical properties. However, the intrinsic zero bandgap characteristic of graphene has so far prevented graphene from building effective electronic and optoelectronic devices. LÄS MER

  3. 2. Amorphous, Nanocrystalline, Single Crystalline: Morphology of Magnetic Thin Films and Multilayers

    Författare :Andreas Liebig; Björgvin Hjörvarsson; Gabriella Andersson; Frank Klose; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Multilayer; Superlattice; X-ray diffraction; X-ray reflectometry; electron diffraction; Rutherford backscattering spectrometry; Interdiffusion; thin film growth; transmission electron microscopy; Epitaxial growth; Fysik; Physics; Fysik;

    Sammanfattning : Properties of magnetic thin film devices cannot be understood without detailed knowledge of their structure. For this purpose, a variety of thin film and multilayer systems have been studied. LÄS MER

  4. 3. Electronic Structure of Some Zincblende Semiconductor Surfaces

    Författare :Yousef Omar Khazmi; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CdTe; valence band; InP; tight-binding; core level; superlattice; surface; Green s function; adsorbates; semiconductor; GaAs; photoemission; electronic structure;

    Sammanfattning : The main aim of this thesis is to study and understand the surface electronic structure of compound semiconductors (ex. GaAs, InP, ..etc. LÄS MER

  5. 4. Cooperative Lithium-Ion Insertion Mechanisms in Cathode Materials for Battery Applications

    Författare :Helen Björk; Tsutomo Ohzuku; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Li-ion battery; cathode materials; single-crystal; X-ray diffraction; delithiation; superlattice; phase transformation; charge-ordering; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : Understanding lithium-ion insertion/extraction mechanisms in battery electrode materials is of crucial importance in developing new materials with better cycling performance. In this thesis, these mechanisms are probed for two different potential cathode materials by a combination of electrochemical and single-crystal X-ray diffraction studies. LÄS MER

  7. 5. Materials for Magnetic Recording Applications

    Författare :Till Burkert; Olle Eriksson; Lars Nordström; Stefan Blügel; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; magnetic materials; magnetic anisotropy; saturation magnetization; magnetic data storage; superlattice; hydrogen; density functional theory; first-principles calculations; two-dimensional magnetism; FP-LMTO; EXAFS; MOKE; Fysik; Physics; Fysik;

    Sammanfattning : In the first part of this work, the influence of hydrogen on the structural and magnetic properties of Fe/V(001) superlattices was studied. The local structure of the vanadium-hydride layers was determined by extended x-ray absorption fine structure (EXAFS) measurements. LÄS MER