A5076833493- Graphene research and applications
- Carbon Nanotubes in Composites
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- X-ray Diffraction in Crystallography
- Boron and Carbon Nanomaterials Research
- Advanced Chemical Physics Studies
- Molecular Junctions and Nanostructures
- Inorganic Fluorides and Related Compounds
- Spectroscopy and Laser Applications
- Surface Chemistry and Catalysis
- Surface and Thin Film Phenomena
- Fullerene Chemistry and Applications
- Porphyrin and Phthalocyanine Chemistry
- Atomic and Molecular Physics
- Metal and Thin Film Mechanics
- Solid-state spectroscopy and crystallography
- Fiber-reinforced polymer composites
- Luminescence Properties of Advanced Materials
- Photochemistry and Electron Transfer Studies
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Inorganic and Organometallic Chemistry
- Magnetism in coordination complexes
- Chemical Thermodynamics and Molecular Structure
Institute of Physics
2012-2024
St Petersburg University
2015-2024
European Synchrotron Radiation Facility
2015
ALBA Synchrotron (Spain)
2010
Uppsala University
2009
MAX IV Laboratory
2009
Lund University
2009
Pushkin Leningrad State University
1971
By means of synchrotron-radiation-based core-level spectroscopies we demonstrate that the degree corrugation in graphene nanomesh on lattice-mismatched transition-metal substrates critically depends strength chemical bonding at interface. The interfacial orbital hybridization between and metal states is rising series Pt(111)-Ir(111)-Rh(111)-Ru(0001). This growing accompanied by a gradual change morphology from nearly flat to strongly corrugated. We provide comparison pore size period for...
Artificial two-dimensional (2D) materials, which host electronic or spatial structure and properties not typical for their bulk allotropes, can be grown epitaxially on atomically flat surfaces; the design investigation of these materials are thus at forefront current research. Here we report formation borophene, a planar boron allotrope, surface Ir(111) by exposing it to flux elemental consequent annealing. By means scanning tunneling microscopy density functional theory calculations, reveal...
The atomic and electronic structure of the lattice-mismatched $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}∕\mathrm{Pt}(111)$ $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}∕\mathrm{Rh}(111)$ interfaces formed by pyrolitic reactions with vaporized borazine has been studied low-energy electron diffraction, scanning tunneling microscopy, x-ray-absorption spectroscopy, core-level valence-band photoemission. It found that on Pt(111), $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}$ forms a nearly flat...
Bottom-up strategies can be effectively implemented for the fabrication of atomically precise graphene nanoribbons. Recently, using 10,10′-dibromo-9,9′-bianthracene (DBBA) as a molecular precursor to grow armchair nanoribbons on Au(111) and Cu(111), we have shown that substrate activity considerably affects dynamics ribbon formation, nonetheless without significant modifications in growth mechanism. In this paper compare on-surface reaction pathways DBBA molecules Cu(111) Cu(110). Evolution...
A very rich Fe-C phase diagram makes the formation of graphene on iron surfaces a challenging task. Here we demonstrate that growth epitaxial films can be realized by chemical vapor deposition at relatively low temperatures, and carbides avoided in excess carbon-containing precursors. The resulting monolayer creates novel periodically corrugated pattern Fe(110). Using low-energy electron microscopy scanning tunneling microscopy, show it is modulated one dimension forming long waves with...
Atomically precise graphene nanoribbons (GNRs) can be fabricated via thermally induced polymerization of halogen containing molecular precursors on metal surfaces. In this paper the effect substrate reactivity growth and structure armchair GNRs (AGNRs) grown inert Au(111) active Cu(111) surfaces has been systematically studied by a combination core-level X-ray spectroscopies scanning tunneling microscopy. It is demonstrated that activation threshold for dehalogenation process decreases with...
The results of the comparative quantitative study oxygen-containing groups adsorbed on surface carbonized sponge scaffold (CSS), highly oriented pyrolytic graphite (HOPG), fullerite C60 and multi-walled carbon nanotubes (MWCNTs) introduced into a high vacuum from atmosphere without any pre-treatment are discussed. studied materials first tested by XRD Raman spectroscopy, then quantitatively characterized XPS NEXAFS. research showed presence oxides water-dissociation products surfaces...
The results of the research a composite based on multi-walled carbon nanotubes (MWCNTs) decorated with CuO/Cu2O/Cu nanoparticles deposited by cupric formate pyrolysis are discussed. study used complementary set methods, including scanning and transmission electron microscopy, X-ray diffractometry, Raman, ultrasoft spectroscopy. investigation show good adhesion between copper coating MWCNT surface through oxygen atom bridge formation atoms outer graphene layer CuO Cu2O oxides. Cu-O-C bond...
The electronic structure of $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}$ films grown on the Ni(111) surface has been studied as a function film thickness using synchrotron radiation based spectroscopic techniques: soft x-ray absorption, core-level photoemission and resonant Auger spectroscopy. A manifestation strong orbital hybridization between Ni $3d$ $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}\phantom{\rule{0.3em}{0ex}}\ensuremath{\pi}$ states consistently observed in all spectra,...
A great variety of two-dimensional (2D) boron allotropes (borophenes) were extensively studied in the past decade quest for graphene-like materials with potential advanced technological applications. Among them, 2D honeycomb is specific interest as a structural analogue graphene. Recently it has been synthesized on Al(111) substrate; however remains unknown to what extent does behave like Here we elucidate and electronic properties this unusual material combination core-level X-ray...
We investigate the bottom-up growth of N = 7 armchair graphene nanoribbons (7-AGNRs) from 10,10'-dibromo-9,9'-bianthracene (DBBA) molecules on Ag(111) with focus role organometallic (OM) intermediates. It is demonstrated that DBBA are partially debrominated at room temperature and lose all bromine atoms elevated temperatures. Similar to Cu(111), form OM chains Ag(111). Nevertheless, in contrast Cu(111) substrate, formation polyanthracene intermediates via an Ullmann-type reaction feasible...
Using a set of microscopic, spectroscopic, and electrochemical methods, detailed study the interrelation between structural properties as-prepared nitrogen-containing multi-walled carbon nanotubes (N-MWCNTs) their modified derivatives is carried out. It was found that after treatment with hydrochloric acid, structure improved by removing amorphous from outer layers N-MWCNTs. On contrary, ion bombardment leads to formation vacancy-type defects both on surface in bulk shown treated have an...
A complex study of the adhesion multi-walled carbon nanotubes to a titanium surface, depending on modes irradiation with He+ ions “MWCNT/Ti” system, was conducted using atomic force microscopy and X-ray photoelectron spectroscopy. quantitative assessment at interface, performed microscopy, demonstrated its significant increase as result treatment system beam helium ions. The nature chemical bonding between surface substrate, which causes this in ion irradiation, investigated by It...
The electronic structure of high-quality ${\mathrm{CrO}}_{2}(100)$ films was investigated by means x-ray absorption and resonant photoemission spectroscopy at the $2p\text{\ensuremath{-}}3d$ excitation threshold. obtained binding energy occupied Cr $3d$ states is in agreement with results predicted within local spin-density approximation using dynamical mean-field theory [L. Craco et al., Phys. Rev. Lett. 90, 237203 (2003)]. reported data support a model ${\mathrm{CrO}}_{2}$ as half-metallic...
The formation of hexagonal boron nitride $(h\text{\ensuremath{-}}\mathrm{B}\mathrm{N})$ monolayers on Ni(111), Rh(111), and Pt(111) has been studied by a combination x-ray emission, angle-resolved valence band photoemission, absorption in search for interface-induced gap states $h\text{\ensuremath{-}}\mathrm{B}\mathrm{N}$. A significant density both occupied unoccupied with $\mathrm{N}\phantom{\rule{0.2em}{0ex}}2p$ $\mathrm{B}\phantom{\rule{0.2em}{0ex}}2p$ characters is observed...
This paper presents the results of combined investigation chemical bond formation in fluorinated multiwalled carbon nanotubes (MWCNTs) with different fluorine contents $(10--55\text{ }\text{wt}\text{ }%)$ and reference compounds (highly oriented pyrolytic graphite crystals ``white'' fluoride) using x-ray absorption photoelectron spectroscopy at $\text{C}\text{ }1s$ $\text{F}\text{ thresholds. Measurements were performed BESSY II (Berlin, Germany) MAX-laboratory (Lund, Sweden). The analysis...
Graphite fluorides with different structural types (CyF)n (y = 2.5, 2, and 1) room temperature graphite were studied by solid state NMR NEXAFS. Data extracted from those two techniques are complementary, providing information about the C–F bonding hybridization character of carbon atom valence states. The comparison data obtained methods such as NMR, Raman, X-ray absorption leads to similar conclusions regarding chemical in fluorographites. Several major configurations fluorinated graphites...
The near-edge x-ray absorption fine structure (NEXAFS) at the $\mathrm{F}\phantom{\rule{0.3em}{0ex}}1s$ threshold has been studied with high-energy resolution for a series of binary fluorides, including KF, $\mathrm{Ti}{\mathrm{F}}_{4}$, $\mathrm{V}{\mathrm{F}}_{4}$, $\mathrm{V}{\mathrm{F}}_{3}$, $\mathrm{Cr}{\mathrm{F}}_{3}$, $\mathrm{Cr}{\mathrm{F}}_{2}$, $\mathrm{Mn}{\mathrm{F}}_{3}$, $\mathrm{Mn}{\mathrm{F}}_{2}$, $\mathrm{Fe}{\mathrm{F}}_{3}$, $\mathrm{Fe}{\mathrm{F}}_{2}$,...