Influence of the Chemical Composition and Local Atomic Packing of Nanostructured MoSx and MoSex Solid Lubricant Coatings on Their Tribological Properties under Complicated Conditions

Technical Physics Letters - We present the results of a comparative investigation of the friction and wear characteristics of MoSx and MoSex coatings in an oxidizing medium (argon–air...     

Comparing Five and Lower-Dimensional Grain Boundary Character and Energy Distributions in Copper: Experiment and Molecular Statics Simulation

Metallurgical and Materials Transactions A - The misorientation of 515 grain boundaries has been determined using electron backscatter diffraction data from an 18 μm thick copper foil with...     

Gas-Phase Treatment of Dump Tailings from Metallurgical Plants in Nitrating Media to Enhance Nickel Extraction

Theoretical Foundations of Chemical Engineering - A new approach to the processing of the dump waste product stored in the tailings dumps of the nickel production enterprise Punda Gourda (Cuba) has...     

Formation of nickel clusters for the growth of carbon nanotubes

The growth of vertically oriented carbon nanotubes on nickel clusters formed by nanoimprint lithography is studied. It is shown that the nanotubes only grow at those places where the catalyst clusters are situated and the diameter of the nanotubes exactly corresponds to the dimensions of the nickel islands.     

Modification of the chemical composition,morphology, and antireflection properties of WSe x films formed by pulsed laser deposition

We have studied the possibility of controlling important structural characteristics of WSe _x films, which belong to the class of layered materials and have good prospects for application in modern nano- and optoelectronic devices. It is established that, by using thermal treatment and ion irradiation during pulsed laser deposition (PLD) in the shadow of an antidroplet shield, it is possible to vary the Se/W atomic ratio from 5 to 1.5, change the character of atomic packing, and obtain films with either smooth or rough surfaces. An increase in the height of parabolic protrusions on the surface up to 200–500 nm leads to a decrease in the optical reflection coefficient in a broad wavelength range from 30% (typical of smooth films) to 6%, which can favor a significant increase in the efficiency of solar cells based on semiconductor films of this type.     

Investigation of electrical properties of organic memristors based on thin polyaniline-graphene films

The possibility of integration of graphene films applying the Langmuir-Schaefer method to the structure of the working channel of the organic memristor is investigated. The variation in electrical characteristics of memristor structures in the presence of graphenes in the working channel of the element is analyzed. New effects such as an increased working voltage range and the S-like shape of current-voltage characteristics are found, which is most probably associated with the charge accumulation in the region of graphene sheets.     

A distribution of Ga+ ions in a silicon substrate for nano-dimensional masking

A nano-dimensional doping method of near-surface silicon layers using the focused ion beam was studied by software tools based on mathematical calculations of ion ranges in crystals. The sizes of local doping regions and concentrations of impurity atoms as function of real process parameters of the nano-dimensional exposure to the ion gallium beam are calculated. Theoretical boundaries of process doping parameters, taking silicon sputtering into consideration are determined.     

MBE-grown nanoheterostructures with increased electron mobility

Multilayered nitride heterostructures AlN/AlGaN/GaN/AlGaN are grown using a Nanofab-100 multichamber domestic complex involving a STE3N3 specialized installation of molecular beam epitaxy. The obtained heterostructures have high structural quality, smooth morphology, and a low dislocation density, which demonstrates the high potential of the nanotechnological complex.     

Production of carbon nanotubes by catalytic gas-phase pyrolysis of ethanol

A setup and growth technology for manufacturing carbon nanotubes by the catalytic gas-phase pyrolysis of ethanol are described. The basic temperature ranges of the reaction for manufacturing carbon nanotubes are elucidated. Atomic force microscopy and transmission electron microscopy are used to analyze carbon nanotube growth during the catalytic gas-phase pyrolysis of ethanol.