Due to their high refractive index, record optical anisotropy and a set of excitonic transitions in visible range at a room temperature, transition metal dichalcogenides have gained much attention. Here, we adapted a femtosecond laser ablation for the synthesis of WSe₂ nanoparticles (NPs) with diameters from 5 to 150 nm, which conserve the crystalline structure of the original bulk crystal. This method was chosen due to its inherently substrate-additive-free nature and a high output level. The obtained nanoparticles absorb light stronger than the bulk crystal thanks to the local field enhancement, and they have a much higher photothermal conversion than conventional Si nanospheres. The highly mobile colloidal state of produced NPs makes them flexible for further application-dependent manipulations, which we demonstrated by creating substrates for SERS sensors.

Transition metal dichalcogenides (TMDCs), particularly molybdenum disulfide (MoS₂), have gained significant attention in the field of optoelectronics and photonics due to their unique electronic and optical properties. The integration of TMDCs with plasmonic materials allows to tailor the optical response and offers significant advantages for photonic applications. This study presents a novel approach to synthesize MoS₂-Au nanocomposites utilizing femtosecond laser ablation in liquid to achieve tunable optical properties in the near-infrared (NIR) region. By adjusting ablation and fragmentation protocols, we successfully synthesize various core–shell and core–shell–satellite nanoparticle composites, such as MoS₂/MoS_xO_y, MoS_xO_y/Au, and MoS₂/MoS_xO_y/Au. UV-visible absorption spectroscopy unveils considerable changes in the optical response of the particles depending on the fabrication regime due to structural modifications. Hybrid nanoparticles exhibit enhanced photothermal properties when subjected to NIR-I laser irradiation, demonstrating potential benefits for selective photothermal therapy. Our findings underscore that the engineered nanocomposites not only facilitate green synthesis but also pave the way for tailored therapeutic applications, highlighting their role as promising candidates in the field of nanophotonics and cancer treatment.

Transition Metal Dichalcogenides (TMDCs) is a rich family of two-dimensional materials with outstanding electrical, mechanical and optical properties. Due to the high refractive index, record optical anisotropy, and a set of excitonic transitions in visible range at a room temperature, TMDCs gained much attention for resonant nanoantennas, subwavelength waveguides and all-dielectric metamaterials. To boost a further progress in the field of dielectric nanoresonators, a femtosecond laser ablation method is promising due to its inherently substrate-/additive-free nature and a high output level. We adapted this approach for the synthesis of WSe2 NPs of various size (from 5 to 150 nm), which conserve the crystalline structure of the bulk crystal. Obtained nanoresonators possess an enhanced optical absorption in comparison to the bulk crystal due to the effective volume field localization, and a photothermal conversion much stronger than that of conventional Si nanoscatters. A highly mobile colloidal state of produced NPs makes them flexible for further application-dependent manipulations.

The relevance. Dental implants are widely used in dentistry to restore the dentition. The primary stability of the implant plays a key role in the successful osseointegration and long-term functionality of the implant. The study of the effect of the microrelief of the implant surface on their primary stability of bone tissue is of great practical importance, as it can help determine the optimal characteristics of the implant surface to achieve the best results during its installation. The aim is to evaluate the effect of the micro-roughness of the surface of dental implants on the torque and their primary stability. Materials and methods. The study included the use of 223 dental implants with a diameter of 4.0 mm, a length of 10 mm with the same geometry. The studied samples corresponded to the geometry of the IRIS LIKO-M implant (LLC NPK Likostom, Russia). The implants were processed by 3 different methods and installed in polyurethane blocks imitating bone tissue of the second type D2. To determine the force (torque) during implant installation, a Venton M3 physiodispenser (China) was used; implant stability (ISQ) after installation was evaluated by a Penguin PFA device (Sweden). Statistical analysis of the data was carried out using the Kruskal–Wallis criterion and the posteriori Dunn criterion. The results of the study. The study showed that groups 2 (acid etching), 3 (laser treatment), 4 (control sample) have a normal distribution of torque and ISQ values, while group 1 (plasma electrolytic oxidation) does not correspond to a normal distribution. The Kruskal–Wallis test revealed statistically significant differences between the groups in terms of torque and stability (ISQ). Dunn's a posteriori test showed statistically significant differences in torque between groups 1 and 4, 2 and 4, 3 and 4, as well as statistically significant differences in ISQ between groups 2 and 4, 3 and 4. Conclusions. The surface characteristics of the implants do not have a statistically significant effect on the primary stability determined by the torque and ISQ indicators.

Dyes used in industries such as textile, paper, and leather are known to be harmful to both human health and aquatic ecosystems. Therefore, finding effective and sustainable methods to remove dyes from wastewater is crucial for mitigating the detrimental effects of pollution.TiN nanoparticles have good absorption and conversion of light energy into thermal energy in the visible range of the spectrum, which makes them promising in various applications, from biomedical to environmental protection. In this work, it is shown that titanium nitride nanoparticles also possess promising adsorption capabilitieseffect. TiN nanoparticles were synthesized by laser ablation method in liquid. Water, acetone and acetonitrile are used as solvent. Nanoparticles were characterized by scanning and transmission microscopy, Raman spectroscopy, which showed the formation of the under-stoichiometric titanium nitride (TiN1-x). TiN nanoparticles are investigated as a promising object for high adsorption It is shown that adsorption of TiN nanoparticles is associated with the electrostatic effect and the presence of pores in the synthesized nanoparticles. Optimal dye absorption capabilities were found to be associated with a low amount of Ti vacancies and high amount of N vacancies acting as donor states. The particles synthesized in water have the highest sorption capacity of dye achieving the value of 136.5 mg/g.