RESEARCH INTERESTS

 

Spectroscopic studies of solids using synchrotron radiation (semiconductors, insulators, glasses & glass ceramics, solid biological samples).

·   Determination of the materials nanostructure (bondlengths, bond angles and coordination numbers) with extended X-ray absorption fine structure spectroscopy (EXAFS).

·   Study of materials electronic structure with near edge x-ray absorption fine structure spectroscopy (defect and conduction band density of states)   (ΝEXAFS).

·   Materials elemental analysis and mapping with X-ray fluorescence spectroscopy (ΧRF).

·   Quantitative analysis and determination of the oxidation state with X-ray photoelectron spectroscopy (XPS).

·   Determination of the size and spatial distribution of nanoparticles using Small angle X-ray scattering (SAXS).

·   Application EXAFS, NEXAFS and XRF with high lateral resolution (1.5-5μm) using focused synchrotron radiation beam.  Determination of the local variations of the valence and the nanostructure in inhomogeneous samples such as microelectronic devices, glass ceramics and biological samples. 

 

The experiments with synchrotron radiation are conducted in synchrotron radiation facilities in Europe

          BESSY, HASYLAB, SLS, ELETTRA, ESRF

 

Materials characterization using Raman spectroscopy.

·    Study of semiconductors for the determination of symmetry, crystalline quality and strain.

·    Study of biological samples for the determination of the amino- acid content. Study of biominerals.

 

Studied materials.

·    Wide band gap semiconductors GaN, AlN, InN, AlxGa1-xN, InxGa1-xN, InxAl1-xN, SiC (effects of growth conditions and processing, e.g. ion implantation and annealing).

·    Si-nitrides: SiNx and SixOyNz

·    Glassy and glass ceramic materials: vitrified and stabilized industrial wastes.

·    Nano-porous adsorbents of toxic elements from drinking water.

·    Nanoparticles of Fe and Mn oxides.

·    Solid biological samples (illness-related variations of chemical composition, distribution and bonding environment of metallic elements in nails and hair). Biominerals and natural pigments in crustacea.

·    Vertebrate fossils

 

 

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