A5048991930- Carbon Nanotubes in Composites
- Graphene research and applications
- Electromagnetic wave absorption materials
- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Conducting polymers and applications
- Nanotechnology research and applications
- Supercapacitor Materials and Fabrication
- Material Properties and Applications
- Fiber-reinforced polymer composites
- Advancements in Battery Materials
- Diamond and Carbon-based Materials Research
- Photonic and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Force Microscopy Techniques and Applications
- Smart Materials for Construction
- Quantum Dots Synthesis And Properties
- Sensor Technology and Measurement Systems
- Advanced Memory and Neural Computing
- Advanced Fiber Optic Sensors
- Neuroscience and Neural Engineering
- Dielectric materials and actuators
- Electrospun Nanofibers in Biomedical Applications
- Carbon and Quantum Dots Applications
- Terahertz technology and applications
Simon Fraser University
2019-2025
Siberian Branch of the Russian Academy of Sciences
2009-2019
Nikolaev Institute of Inorganic Chemistry
2010-2019
National Research Tomsk State University
2014-2018
Novosibirsk State University
2011-2017
Russian Academy of Sciences
2010-2012
Nitrogen-doped and pure carbon nanotube (CNT) based composites were fabricated for investigating their dielectric properties in static regime as well electromagnetic response microwave frequency range (Ka-band). Two classes of host matrix—polystyrene phosphate unfired ceramics—have been used fabrication. The study reveals miscellaneous effect nitrogen doping on the permittivity, dc conductivity interference shielding efficiency CNT-based composites, produced with both polymer ceramic...
Abstract Detonation nanodiamonds (NDs) were deposited on the surface of aligned carbon nanotubes (CNTs) by immersing a CNT array in an aqueous suspension NDs dimethylsulfoxide (DMSO). The structure and electronic state obtained CNT–ND hybrid material studied using optical electron microscopy Infrared, Raman, X-ray photoelectron near-edge absorption fine spectroscopy. A non-covalent interaction between preservation vertical orientation CNTs revealed. We showed that current-voltage...
Polystyrene composites with 0.5 wt. % loading of oriented multiwall carbon nanotubes (MWCNTs) have been produced by forge rolling method. The showed anisotropy transmission and reflection terahertz radiation depending on sample orientation relative to the polarization electromagnetic wave. structural characteristics (nanotube ordering, length, defectiveness) were estimated fitting theoretical dependencies calculated within Clausius-Mossotti formalism for cylindrical particles experimental...
Single-walled carbon nanotubes (SWCNTs) possessing a confined inner space protected by chemically resistant shells are promising for delivery, storage, and desorption of various compounds, as well carrying out specific reactions. Here, we show that SWCNTs interact with molten mercury dichloride (HgCl2) guide its transformation into dimercury (Hg2Cl2) in the cavity. The chemical state host remains almost unchanged except small p-doping from guest Hg2Cl2 nanocrystals. density functional theory...
Nitrogen‐containing porous carbon has been produced by acetonitrile vapor deposition at 700 and 800 °C on the products of thermolysis calcium tartrate doped iron. The template was removed dilute HCl acid treatment, samples obtained were comparatively studied using transmission electron microscopy, N 2 adsorption measurements, thermogravimetric analysis (TGA), X‐ray photoelectron near‐edge absorption fine structure spectroscopy. It found that increase in synthesis temperature results an...
It is commonly accepted that the presence of nitrogen atoms in a graphene lattice improves many properties carbon materials and particularly enhances their electrochemical capacity Li ion batteries. Here, we present model experiments for revealing difference interaction lithium with N-doped N-free samples by monitoring changes electronic states after deposition vapors. Graphene films have been grown chemical vapor on copper substrates using methane acetonitrile as precursors. The structure...
Abstract Anisotropic composite materials have been prepared by repeated forge rolling of polystyrene and carbon nanotubes (CNTs) with length ∼65 µm. Transmission spectra the composites were recorded for two different polarizations electric field. Obtained data indicated that resulted in a predominant orientation CNTs polymer matrix. response was measured at 130 µm wavelength on Novosibirsk terahertz free electron laser angular dependence transmitted light determined. Absorption spectrum...
Hybrids of holey graphene (HG) and MoS 2 have been prepared by a treatment few‐layered HG amorphous 3 , taken in weight ratio ≈5 ≈10%, at 100 bar 600 °C under vacuum. A study the products electron microscopy, X‐ray diffraction, Raman scattering, photoelectron spectroscopy has detected coating stacks thin layers. The near‐edge absorption fine structure revealed covalent bonding between components. hybrid with 5 wt.% showed better rate capability for Li‐ion intercalation/deintercalation as...
Interface interactions in multicomponent nanoparticles can affect electromagnetic properties of an absorbing system. In this work, we investigate the response multi-walled carbon nanotubes (MWCNTs) filled with iron-containing (ICNs) terahertz frequency range. MWCNTs different iron content have been synthesized by aerosol-assisted catalytic chemical vapour deposition method from toluene containing a certain quantity ferrocene used as catalyst. According to x-ray diffraction analysis,...
Poly(methyl metacrylate) samples with uniformly dispersed single-wall carbon nanotubes (SWCNTs) were mechanicaly stretched up to 4 times at 150 °C. As a result, SWCNTs oriented preferentially along the stretch direction. The width of angular distribution SWCNT orientation determined by polarized Raman scattering and THz absorption spectroscopy was 15 12°, respectively. Both methods revealed high anisotropy optical response composite film. Its application as an efficient polarizer in wide...
Vertically aligned multi‐wall carbon nanotube (VA‐MWCNT) arrays have been used for deposition of molybdenum sulphide from a water solution ammonia molybdate and thiourea. A hydrothermal synthesis at 175 °C resulted in formation quasi‐spherical nanoparticles inside on the top surface without destruction array structure. X‐ray photoelectron spectroscopy revealed disulfide (MoS 2 ) composition nanoparticles, while Raman detected bands characteristic light scattering MoS crystallites only after...
Some instances of electron field emitters are characterized by frequency-dependent hysteresis in their current–voltage characteristics. We argue that such can be classified as memristive systems and introduce a general framework to describe response. As specific example our approach, we consider emission from carbon nanotube array. Our experimental results demonstrate low-field hysteresis, which is likely caused an electrostatic alignment some the nanotubes applied field. formulate model...
Abstract Composites from polystyrene and multi-walled carbon nanotubes (CNTs) were prepared by a forge-rolling method. The predominant CNT alignment with the rolling direction was deduced measurements of filler content dependence on composite permittivity. A simple method reorientation in polymer matrix developed, it shown that effective longitudinal polarizability samples obtained is ˜5 times larger than transverse one. Keywords: Carbon nanotubespolymer compositepermittivity
Nanodiamonds (NDs) produced in a detonation process are strongly aggregated, which hampers fully realising their properties at the nanoscale, particularly, composites. Moreover, during annealing, tightly bonded ND particles transformed into so–called onion–like carbon (OLC), where several onions coated by joint graphitic layers. Here, we demonstrate that NDs and OLC can be disaggregated using polymer–assisted forge–rolling. The isolated diamond nanocrystals with size of ∼5 nm typical for...
Polystyrene composites with 0.25 wt. % loading of oriented multiwall carbon nanotubes (MWCNTs) have been produced by stretching method. The showed anisotropy transmission millimeter wave radiation depending on sample orientation relative to the polarization electromagnetic wave.
Abstract Arrays of aligned multi-walled nitrogen-doped carbon (CNx) nanotubes were synthesized by the catalytic chemical vapor deposition method using acetonitrile and a mixture toluene taken in equal ratio as sources for nanotube growth. The structure arrays was investigated means scanning electron microscopy (SEM) angle-resolved X-ray absorption spectroscopy near CK- NK-edges. width angular distribution CNx determined from Fourier analysis SEM images, ordering graphitic layers evaluated...