High-resistive (1012 Ohm/□) oxide-graphene films with thickness varying from 5 nm to several micrometers were produced and studied. Films of 5–150 nm on glass had a transparency of 93–98% for wave-len

We study photoluminescence (PL) spectra and exciton dynamics of the MoS₂ monolayer (ML) grown by the chemical vapor deposition technique. In addition to the usual direct A-exciton line, we observe a low-energy line of bound excitons dominating the PL spectra at low temperatures. This line shows unusually strong redshift with an increase in the temperature and submicrosecond time dynamics suggesting indirect nature of the corresponding transition. By monitoring the temporal dynamics of exciton PL distribution in the ML plane, we observe diffusive transport of A-excitons and measure the diffusion coefficient up to 40 cm²/s at elevated excitation powers. The bound exciton spatial distribution spreads over tens of micrometers in $\sim 1$ μs. However, this spread is subdiffusive, characterized by a significant slowing down with time. The experimental findings are interpreted as a result of the interplay between the diffusion and Auger recombination of excitons.

The aim of the study is the development of two-layer materials based on ultra-high-molecular-weight polyethylene (UHMWPE) and isoprene rubber (IR) depending on the vulcanization accelerators (2-mercaptobenzothiazole (MBT), diphenylguanidine (DPG), and tetramethylthiuram disulfide (TMTD)). The article presents the study of the influence of these accelerators on the properties and structure of UHMWPE. It is shown that the use of accelerators to modify UHMWPE leads to an increase in tensile strength of 28–53%, a relative elongation at fracture of 7–23%, and wear resistance of three times compared to the original UHMWPE. It has been determined that the introduction of selected vulcanization accelerators into UHMWPE leads to an increase in adhesion between the polymer and rubber. The study of the interfacial boundary of a two-layer material with scanning electron microscopy (SEM) and infrared spectroscopy (FTIR) showed that the structure is characterized by the presence of UHMWPE fibrils localized in the rubber material due to mechanical adhesion.

The development of economical and scalable methods for synthesizing high-quality graphene remains a pivotal challenge in materials science. This study presents an efficient approach for synthesizing turbostratic graphene with micron-sized domains from an accessible bioprecursor-activated charcoal—using fast Joule heating. We demonstrate that ultra-rapid thermal annealing (~16.2 kJ/g, up to 3000 K) triggers a phase transition from amorphous carbon to a highly graphitized structure. Comprehensive characterization via SEM, AFM, Raman spectroscopy, and XRD revealed the formation of large flakes with lateral dimensions up to 1.5 µm and thicknesses ranging from 4 to 200 nm. Raman mapping further uncovered a heterogeneous structure with alternating regions exhibiting different degrees of interlayer coupling, characteristic of turbostratic stacking. The key feature of the material is its turbostratic layer stacking, confirmed by the combination of XRD data showing an interlayer distance of 3.436 Å and Raman spectra characteristic of decoupled graphene layers. The synthesized material exhibits excellent electrical transport properties, with a bulk resistivity of 0.51 Ω·cm—an order of magnitude lower than that of the initial charcoal. These findings highlight the potential of the developed method for producing electrode materials for energy storage devices and conductive composites.

This study presents the results of investigation into hemoglobin property alterations in cervical cancer (CC) patients before and after radiation therapy using Raman spectroscopy. Dry blood smears from CC patients and healthy donors were analyzed using a Raman spectrometer with 532 nm excitation wavelength. The results revealed significant impairments in hemoglobin’s oxygen transport function. Comparative analysis of spectral characteristics demonstrated higher oxyhemoglobin concentrations in the control group versus CC samples, indicating reduced oxygen-binding capacity in the pathological state. Peak shifts and intensity changes suggested increased deoxyhemoglobin fractions in CC patients. Analysis of key vibrational modes (991, 1127, 1165, 1300, 1337 cm⁻¹) confirmed conformational changes in the heme group and impaired oxygen-binding function. Particularly significant was the altered intensity ratio I₁₃₇₅/I₁₁₂₇ (2-5.5% difference versus controls), reflecting decreased R-state hemoglobin fractions. The study identified increased hemoglobin-NO complexes (20% rise in I₁₆₁₈/I₁₅₈₀) while methemoglobin levels remained stable. We also observed changes in erythrocyte physicochemical properties: increased membrane fluidity (35% higher I₂₈₅₀/I₂₈₈₀) and enhanced amino acid environment polarity (23% decrease in I₂₉₃₀/I₂₈₅₀) in CC patients. Radiation therapy exacerbated these changes, though its impact on oxygen-binding capacity was less pronounced than the oncological process itself.

The development of economical and scalable methods for synthesizing high-quality graphene remains a pivotal challenge in materials science. This study presents an efficient approach for synthesizing turbostratic graphene with micron-sized domains from an accessible bioprecursor – activated charcoal – using fast Joule heating. We demonstrate that ultra-rapid thermal annealing (~16.2 kJ/g, up to 3000 K) triggers a phase transition from amorphous carbon to a highly graphitized structure. Comprehensive characterization via SEM, AFM, Raman spectroscopy, and XRD revealed the formation of large flakes with lateral dimensions up to 1.5 µm and thicknesses ranging from 4 to 200 nm. Raman mapping further uncovered a heterogeneous structure with alternating regions exhibiting different degrees of interlayer coupling, characteristic of turbostratic stacking. The key feature of the material is its turbostratic layer stacking, confirmed by the combination of XRD data showing an interlayer distance of 3.436 Å and Raman spectra characteristic of decoupled graphene layers. The synthesized material exhibits excellent electrical transport properties, with a bulk resistivity of 0.51 Ω·cm – an order of magnitude lower than that of the initial charcoal. These findings highlight the potential of the developed method for producing electrode materials for energy storage devices and conductive composites.