A5089566046- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Carbon Nanotubes in Composites
- Graphene research and applications
- Force Microscopy Techniques and Applications
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Atomic and Subatomic Physics Research
- Carbon and Quantum Dots Applications
- Metal and Thin Film Mechanics
- Advanced NMR Techniques and Applications
- Luminescence and Fluorescent Materials
- Laser-Matter Interactions and Applications
- Electronic and Structural Properties of Oxides
- Advancements in Battery Materials
- Advanced materials and composites
- Semiconductor materials and devices
- Fullerene Chemistry and Applications
- Molecular Junctions and Nanostructures
- Laser-Ablation Synthesis of Nanoparticles
- Graphene and Nanomaterials Applications
- Silicon Nanostructures and Photoluminescence
- Boron and Carbon Nanomaterials Research
- Lanthanide and Transition Metal Complexes
- Nanocluster Synthesis and Applications
Ioffe Institute
2015-2024
ITMO University
2018-2024
Anhui University
2021-2024
Hosei University
2017-2023
St. Petersburg College
2018-2021
Physico-Technical Institute
2009-2020
Columbus NanoWorks (United States)
2018
Russian Academy of Sciences
1997-2011
Saint Petersburg State Electrotechnical University
2009-2011
St Petersburg University
2010
Carbon dots (CDs) have received tremendous attention for their excellent photoluminescence (PL) properties. However, it remains a great challenge to obtain CDs with ultraviolet (UV, 200-400 nm) emission in solid state, which requires strict control of the structure and overcoming aggregation-caused quenching (ACQ). Herein, new sp3 compartmentalization strategy is developed meet these requirements, by employing acetic acid promote fractions bonding during synthesis CDs. It markedly decreases...
An easy and convenient method for the synthesis of cobalt magnesium ferrite nanoparticles is demonstrated using liquid foams as templates. The foam formed from an aqueous mixture anionic surfactant desired metal ions, where ions are electrostatically entrapped by at thin borders between bubbles their junctions. hydrolysis carried out alkali resulting in formation nanoparticles, with playing role a template. However, ferrites formula MFe2O4, ion iron possess oxidation states +2 +3,...
We report on detailed study of detonation nanodiamonds (DNDs) whose surface has been chemically modified by copper with the aid ion exchange in water DND suspension. High resolution transmission electron microscopy, Raman, IR, magnetic resonance (EMR), nuclear (NMR), and superconducting quantum interference device techniques were used for characterization DND. Carboxyl groups, appearing a nanodiamond particle during its synthesis purification processes, provide an effective binding divalent...
Magnetic resonance techniques (electron paramagnetic (EPR) and nuclear magnetic (NMR)) are used for tracking the multi-stage process of fabrication fluorescent nanodiamonds (NDs) produced by high-energy electron irradiation, annealing, subsequent nano-milling. Pristine commercial high pressure temperature microdiamonds (MDs) with mean size 150 μm contain ~5 × 1018 spins/g singlet (S = 1/2) substitutional nitrogen defects P1, as well sp3 C–C dangling bonds in crystalline lattice. The...
We report on EPR and 13C 1H NMR studies of detonation nanodiamond particles with surface grafted by paramagnetic gadolinium ions obtained ion exchange hydrogen atoms carboxyl groups through the reaction aqueous suspension an solution nitrate. Our findings give clear evidence that Gd3+ are chemically bound to interact electron nuclear spins diamond nanoparticle, which results in acceleration spin–lattice relaxations. A model positioning DND terminated oxygen-containing is suggested. The...
Nanographene and nanodiamond are new members of nanocarbons, which consist nano-sized hexagonal tetrahedral networks, respectively. The presence edges surfaces distinguishes nanographene nanodiamond, respectively, from other nanocarbons owing to their structure dependent electronic features. has an unconventional nonbonding pi-state (edge state) localized around its edge that is on the geometry. states, having spins, impart a nanographene-based molecular magnetic character....
We report on a 1 H NMR study of diamond nanoparticles decorated by copper and cobalt. Increase in the relaxation rate under decoration results from interactions hydrogen nuclear spins surface hydrocarbon hydroxyl groups with paramagnetic cobalt ions. This finding reveals appearance Cu 2+ or Co ions detonation nanodiamond (DND) rather than as separate phase, which is consistent 13 C data same samples. Our shed light mechanism ion incorporation. A topological model for relative position atoms...
Size dependence of physical properties nanodiamond particles is crucial importance for various applications in which defect density and location as well relaxation processes play a significant role. In this work, the impact defects induced by milling micron-sized synthetic diamonds was studied magnetic resonance techniques function particle size. EPR 13C NMR studies highly purified commercial micro- nanodiamonds were done fractions separated sizes. Noticeable acceleration nuclear...
We report on magnetic susceptibility, NMR, and EPR measurements of pristine Fe-doped micro- nanosized graphenes (LGr NGr), prepared by a unique microwave enabled technique from graphite particles. Significant orbital diamagnetism in the studied compounds (∼70% that bulk graphite) is revealed. At T < 30 K, weak paramagnetism due to edge π-electronic spin states observed. Reduction lateral size graphene sheets results suppression strengthening paramagnetic contribution an increased number open...
We propose and demonstrate a novel range of models to accurately determine the optical properties nitrogen-free carbon quantum dots (CQDs) with ordered graphene layered structures. confirm results our against full experimental for CQDs available from an extensive review literature. The can be equally applied varied sizes different oxygen content in basal planes constituent graphenic sheets. that experimentally observed blue fluorescent emission associated either small oxidised areas on...
We report on XRD, NMR, and EPR study of commercial micro‐ nano‐diamonds the SSX series fabricated by a shock wave compression method. XRD data analysis shows that samples consist nanometer cubic diamond domains intermixing with stacking faults twins. show as‐received reveal graphitic component, which may be removed additional purification. Crushing initial microdiamond powder into submicron sizes does not result in noticeable variations parameters. This finding is explained fact diamonds are...