V.N. Matveev

The structure and electromigration behaviour of aluminium films deposited by the partially ionized beam technique

Abstract High purity aluminium films were deposited by the partially ionized beam technique. The structure of the films was investigated by transmission electron microscopy. The influences of the accelerating voltage and subsequent annealing on the average grain size, grain size distribution, texture and grain boundary morphology were studied. It was observed that the appearance of a large number of special grain boundaries in the annealed films deposited with an accelerating voltage increased the electromigration interruption lifetimes of the films.

Structure of graphene nanotube hybrid materials produced via single-stage CVD

The structures of graphene layer-carbon nanotube hybrid films produced via CVD with a single-stage flow of acetylene into a chamber containing a prepared substrate are studied. It is shown that such films have a hybrid double-layer structure consisting of a graphene layer and a dense continuous network of nanotubes. The graphene layer contains continuous extended areas 10–50 μm in size and island areas ∼0.1 μm in size. TEM images lead to the conclusion that the graphene layer and carbon nanotubes are bound by covalent bonds.

Selective growth of single-wall carbon nanotubes and the fabrication of devices on their basis

Single-wall carbon nanotubes were synthesized on specified parts of oxidized silicon substrates by single acetylene burst CVD and studied with high-resolution scanning electron and scanning probe micro-scopes. The resistance of individual nanotubes and nanotube series was measured using devices fabricated by the deposition of Pd and Pd/Al electrodes on the obtained single-wall nanotubes. The contact potential difference between Pd electrodes and carbon nanotubes was measured in the Kelvin mode of a scanning probe microscope.

The effect of catalyst nanoparticle preparation techniques on the structure of carbon nanotubes

The effect of the composition, deposition method, and preliminary annealing temperature of catalyst thin films on the structure of catalyst nanoparticles and carbon nanotubes synthesized by CVD with a single acetylene burst was studied. A catalyst preparation technique was found that yields the narrowest distribution of the diameters of nanoparticles and of single-wall carbon nanotubes grown on them.