A5073817624- Graphene research and applications
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- Nanoparticles: synthesis and applications
- Molecular Junctions and Nanostructures
- Photonic and Optical Devices
- Surface and Thin Film Phenomena
- Ferroelectric and Piezoelectric Materials
- Phase-change materials and chalcogenides
- Nanocluster Synthesis and Applications
- Microwave Dielectric Ceramics Synthesis
- Laser Material Processing Techniques
- Force Microscopy Techniques and Applications
- Luminescence Properties of Advanced Materials
- Nonlinear Optical Materials Studies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Perovskite Materials and Applications
- Electronic and Structural Properties of Oxides
- Ocular and Laser Science Research
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Organic and Molecular Conductors Research
University of Belgrade
2014-2024
Walsh University
2024
Institute of Physics Belgrade
2016-2022
Tapping mode atomic force microscopy (AFM) is employed for dynamic plowing lithography of exfoliated graphene on silicon dioxide substrates. The shape the sheet determined by movement vibrating AFM probe. There are two possibilities depending applied force. At moderate forces, tip only deforms and generates local strain order 0.1%. For sufficiently large forces can hook then pull it, thus cutting along direction motion. Electrical characterization based electric microscopy, Kelvin probe...
In this work, we have examined the optical properties of exfoliated graphene on an Si/SiO2 substrate using spectroscopic imaging ellipsometry in visible range (360–800 nm). Measured spectra were analyzed by model based Fresnel coefficient equations. The was supported correlated Raman and atomic force microscopy measurements. complex refractive index obtained inversion measured data. Fano line-shape used to parameterize properties. Measurements highly reliable due numerous advantages...
In this study, we have examined the effects of transfer residue and sample annealing on optical properties chemical vapor deposited graphene, transferred onto a sapphire substrate. The absorption graphene was obtained from point-by-point inversion spectroscopic ellipsometry measurements in visible ultraviolet ranges (250–800 nm). Measured spectra were analyzed by models based Fresnel coefficient equations. supported correlated Raman, scanning electron microscopy, atomic force microscopy...
The heterogeneity of stem cells represents the main challenge in regenerative medicine development. This issue is particularly pronounced when it comes to use primary mesenchymal stem/stromal (MSCs) due a lack identification markers. Considering need for additional approaches MSCs characterization, we applied Raman spectroscopy investigate inter-individual differences between bone marrow (BM-MSCs). Based on standard biological tests, BM-MSCs analyzed donors fulfill all conditions their while...
In this work, we present an observation of laser induced periodic surface structures (LIPSS) on graphene. LIPSS other materials have been observed for nearly 50 years, but until now, not Our findings multi-layer graphene were consistent with previous reports materials, thus classifying them as high spatial frequency LIPSS. generated in air environment by a linearly polarized femtosecond excitation wavelength λ 840 nm, pulse duration τ ∼150 fs, and fluence F ∼4.3–4.4 mJ/cm2. The perpendicular...
We investigate the optical response of graphene via spectroscopic ellipsometry in ultraviolet and visible ranges. The conductance is described by a Fano model. parameters this model are extracted from our measurements, complex refractive index obtained. Graphene's dispersion relation shows that density states function has logarithmic van Hove singularity corresponding to M point Brillouin zone. exciton binding energy calculated as difference between resonant saddle energies.
Abstract In this paper, we describe synthesis and characterization of YVO 4 Eu 3+ ‐doped nanopowders. Two methods preparation were used—solution combustion (SCS) classical ceramic method (CCM)—and compared. Morphology structure all samples characterized with atomic‐force microscopy (AFM), X‐ray diffraction (XRD), field‐emission scanning electron (SEM). Raman spectroscopy was used to discuss the isotope‐like effect. It is confirmed that doping ions results in a change spectra doped...
We present a study on the damage effects of femtosecond laser interaction exfoliated multi-layer graphene using techniques optical microscopy, atomic force and Raman spectroscopy. Various were observed. The ablation threshold was found to be ∼4 mJ cm−2, slightly higher in transmission mode than reflection mode. This work also demonstrates feasibility ultrafast patterning graphene.
We investigate the influence that an embedded graphene layer has on guided modes of optical waveguides using exact numerical calculations and a convenient perturbation theory. The latter is found to be highly accurate allowing graphene-induced changes modal propagation constants determined as product factor characterizing properties bare waveguide conductivity graphene. In this manner, geometry electro-optical modulation efficiency can considered optimized separately. This result then used...
Spectroscopic ellipsometry combined with measurements of electrical characteristics and Kelvin probe force microscopy have been employed to investigate the interaction between graphene a gold substrate, consequent changes graphene's complex refractive index on gold. A strong blue shift, as much 350 meV, prominent absorption peak (exciton-shifted M-point Van Hove singularity in ultraviolet range) has observed, respect position for sample an insulating substrate where this was observed at...
The growth of small conjugated molecules on graphene is increasing interest, since the latter bears potential to serve as a transparent electrode for organic solar cells and light emitting diodes. Here, parahexaphenyl thin films have been grown by hot wall epitaxy SiO2 supported exfoliated graphene. arising morphologies—studied atomic force microscopy—exhibit strong dependence deposition temperature. At temperatures from 280 K–333 K, islands consisting almost upright standing needles...
We present a study of charge density wave (CDW) ordering in ${\mathrm{CeTe}}_{3}$ at room temperature using scanning tunneling microscope and Raman spectroscopy. Two characteristic CDW vectors obtained from the Fourier analysis are assessed to be $|{\mathbf{c}}^{*}\ensuremath{-}\mathbf{q}|=4.19\phantom{\rule{0.28em}{0ex}}{\mathrm{nm}}^{\ensuremath{-}1}$ $|\mathbf{q}|=10.26\phantom{\rule{0.28em}{0ex}}{\mathrm{nm}}^{\ensuremath{-}1}$ where $|{\mathbf{c}}^{*}|=2\ensuremath{\pi}/c$ is reciprocal...
We investigate the variation of graphene-waveguide coupling strength G, whose magnitude is crucial parameter efficient graphene-based electro-absorptive optical modulators, with waveguide geometry and its graphene coverage. By sweeping a wide geometrical space, we show that G can be improved up to few times by optimising width height. find high values cannot simply related modal confinement factor assess impact small detachment from vertical boundaries. Using perturbation theory, demonstrate...
We present studies of structural, magnetic, and electrical properties Zn1-x Mn x SnSb2+MnSb nanocomposite ferromagnetic semiconductors with the average Mn-content, [Formula: see text], changing from 0.027 up to 0.138. The magnetic force microscope imaging done at room temperature shows presence a strong signal coming MnSb clusters. Magnetic show paramagnet-ferromagnet transition Curie temperature, T C, equal about 522 K cluster-glass behavior CG, 465 K, both related magnetotransport that all...
Thin copper selenide films were synthesized on polyamide sheets using the successive ionic layer adsorption and reaction (SILAR) method at three different temperatures. It was found that elevating temperature of solution led to creation with features. X-ray diffraction characterization revealed all crystallized into a cubic Cu2−xSe, but crystallinity parameters. With temperature, grain size increased (6.61–14.33 15.81 for 40, 60 80 °C, respectively), while dislocation density strain...
In this study, graphene samples prepared by mechanical exfoliation were examined Raman spectroscopy. The Au electrical contacts, fabricated using photolithography, allowed the application of a gate voltage between and Si substrate. spectra sample, we observed shifts position, changes intensity width variations G 2D peaks with change voltage. Spatial mapping was performed showing in intensities different flake regions.