Формирование наноструктурированных пленок MoS-=SUB=-2-=/SUB=-, WS-=SUB=-2-=/SUB=-, MoO-=SUB=-2-=/SUB=- и гетероструктур на их основе

In this work thin film coatings based on WS2, MoS2, MoO2 and their composites were synthesized, morphological and structural properties of deposited coatings were studied. Chemical vapor deposition with heated MoO3, WO3, S powder as precursors was used. Dependence of structural and morphological properties, chemical composition of deposited films on parameters of synthesis was defined. Films of vertically aligned 10 nm thick plate crystals consisting both of pure MoO2 and MoO2 covered with thin MoS2 layer were obtained. Formation of polycrystalline films of regular triangular shaped WS2 and uniform continuous 20 nm thick WS2 films with covering area of 2x2mm has also been observed. In this work we also report about synthesis of films consisting of regular triangular shaped WS2 crystals and MoS2 irregularly shaped crystals overlapping each other.

Mechanically rollable photodetectors enabled by centimetre-scale 2D MoS2 layer/TOCN composites

Two-dimensional (2D) molybdenum disulfide (MoS2) layers are suitable for visible-to-near infrared photodetection owing to their tunable optical bandgaps. Also, their superior mechanical deformability enabled by extremely small thickness and van...

Stabilizing an ultrathin MoS2 layer during electrocatalytic hydrogen evolution with a crystalline SnO2 underlayer

A molybdenum disulfide coating deposited on a macroporous substrate as an electrocatalyst is mobile on an underlying amorphous tin dioxide substrate, but remains continuous and impervious to acidic conditions on crystalline tin dioxide.

A Study of Wear in Thin Coatings Applied to Convex-Concave Gearings

The submitted contribution deals with the wear of thin coatings applied to convex–concave gearings for gear made from C45E steel. The influence of the tribological characteristics (friction coefficient, wear, adhesion and hardness) of the TiN, TiCN coatings and the combined coating of TiCN + MoS2 on convex–concave gearing is described, from the aspects of scuffing formation. Scuffing tests were done on C–C gears. Coatings were applied by arc–ion-plating (AIP) and magnetron sputter-ion-plating (MSIP) methods. The thickness of the deposited coating and its chemical composition were determined by SEM and EDX analysis. Load-bearing capacity was evaluated by a Niemann tester. The TiCN + MoS2 combined coating with the MoS2 layer on the top reached the lowest coefficient of friction. However, after a rapid wearing of the MoS2 layer, this value dropped to a comparable value of TiCN. The nano-hardness of the TiCN layer was higher in comparison with TiN. Thin and soft MoS2 layers cracked already at lower load levels and separated from the substrate at the 5th load stage. The formation of scuffings for selected coatings documented in this article was solved for convex–concave gearing working also in interaction with Biogear S 150 and Biohyd MS 46 oils.

Sensitivity and Stability Enhancement of Surface Plasmon Resonance Biosensors based on a Large-Area Ag/MoS2 Substrate

Surface plasmon resonance (SPR) sensors based on a silver film suffer from signal degradation due to silver oxidation in aqueous sensing environments. To overcome this limitation, we fabricated the planar plasmonic substrate employing an atomic MoS2 layer on a silver surface. Successful production of a large-area MoS2 monolayer blocks the penetration of oxygen and water molecules. In addition, we theoretically and experimentally found that MoS2 layer on the silver film can improve the SPR sensitivity and stability significantly. In this study, the proposed SPR substrate has the potential to provide highly enhanced sensor platforms for surface-limited molecular detections.