Persons

The method for calculating the field-emission current from single carbon nanotubes in an external electric field, directed along the nanotube axis, has been presented. The method is based on a semi-classical approach implementing the sub-barrier tunneling. It has been shown that in case of the high-fields the current corresponds to the Fowler-Nordheim mechanism for field emission, and in the case of the low ones - has deviations related to the potential barrier behavior feature.

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Interaction of the electromagnetic radiation with the magnetofunctionalized CNT-nanocomposite is considered within the model of distributedrandom resistive-inductance-capacitor contours. The approach is based on the presentation of the nanocomposite as a system consisting of CNT matrix, ferromagnetic nanoparticles and interfaces between CNT and nanoparticles. Calculations reveal a wide spectrum of possible resonance phenomena caused both by the presence of contours and peculiarities of CNT nanocomposite by itself.

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A model of the nucleation thermodynamics, which takes into account the surface tension value, has been developed. The experiments on formation of the iron clusters formed during the process of ferrocene clusters pyrolysis at various temperatures have been conducted. Based on the theoretical and experimental data the methods for determining the temperature dependence of the surface tension of nano-dimensional clusters have been developed, and the influence of this parameter on the size distribution of clusters has been shown.

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The thermodynamics of the metal nanocluster formation has been developed. An expression for the distribution function of clusters by sizes depending on their production condition has been obtained. It has been shown that the surface tension plays an important role in the cluster formation. The surface tension coefficient value for the iron clusters at 950°C has been found.

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The influence of the ferrocene concentration in the working gas mixture on the growth of the carbon nanotubes by the CVD method has been investigated. It has been shown that the change of the ferrocene concentration in the gas mixture, among other factors, has a significant influence on the CNT growth. The ferrocene concentration decrease increases the melt free energy and leads to growth of the nanotubes with less diameter, having, respectively, the less number of the walls - 2 or 3. The ferrocene concentration increase exceeding 1% results in the quality decrease of the growing nanotubes.

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