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Your search keyword '"Dmitry Kovalev"' showing total 4 results
Start Over Author "Dmitry Kovalev" Publisher the electrochemical society
4 results on '"Dmitry Kovalev"'

1. Catalytic Activity of Hybrid Metal/Silicon and Metal/Silicon Dioxide Nanocomposites

Author

Dmitry Kovalev, Alexei A. Lapkin, Bernhard Goller, and Sergej Polisski

Subjects
Materials science, Nanocomposite, Silicon, Silicon dioxide, Inorganic chemistry, technology, industry, and agriculture, chemistry.chemical_element, Catalysis, Metal, chemistry.chemical_compound, chemistry, Chemical engineering, visual_art, visual_art.visual_art_medium
Abstract

Here we demonstrate that H-terminated porous silicon (PSi) powders and layers can be utilized as highly efficient reductive templates for noble metal salts. The metal salt reduction results in a metal nanoparticle (NP) formation in the porous matrix of PSi. Gold NP formation has been monitored in-situ by measuring the plasmon resonance response. Pt NPs, formed in the pores of PSi, were investigated by transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) analysis. Furthermore, hybrid Pt/PSi nanocomposites exhibit a high catalytic activity for CO oxidation. Some of the samples were oxidized to obtain Pt/PSiOx nanocomposites for comparison of catalytic activity.

Published
2008

2. Photoexcited Silicon Nanocrystals as Multifunctional Spin-Flip Activator

Author

Sergej Polisski, Bernhard Goller, Dmitry Kovalev, Konstantin N. Loponov, and Andriy Moskalenko

Subjects
Photoluminescence, Materials science, Silicon, Physics::Instrumentation and Detectors, Exciton, chemistry.chemical_element, Discrete dipole approximation, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Photochemistry, Acceptor, Condensed Matter::Materials Science, chemistry, Chemical physics, Activator (phosphor), Molecule, Spin-flip
Abstract

Nano-sized silicon crystals have entirely new physical properties which do not occur in its bulk form. Investigation of its photoluminescence properties can explain the mechanism of transferring energy from photoexcited excitons confined in silicon nanocrystals to energy accepting substances via electron exchange mechanism. This excitation process changes the electronic spin structure of the acceptor molecule, which is forbidden in the dipole approximation, and therefore it requires the involvement of photosensitizers.

Published
2008

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