Effect of electronic modification on nanostructures stability to degradation

Artem Leonidovich Kozlovskiy, Inesh Kenzhina, Marat Kaikanov, A Stepanov, V Shamanin, Maxim Vladimirovich Zdorovets, Alexander Tikhonov

Materials Research Express, 2018

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DOI 10.1088/2053-1591/aacfa4
Data confidence 70 medium
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Abstract

One of the ways to improve the corrosion resistance of nanomaterials is the use of ionizing radiation for directional modification of structural properties. The paper presents results of directional modification of nanostructures using flows of low-energy electrons to change the structural properties of Cu nanotubes. Also, we present the dependence of the degradation degree in various aggressive media and time in a medium. The greatest deterioration in crystallographic characteristics of unmodified nanostructures in corrosive media is observed on the day 10th, which is due to partial destruction of the crystal structure as a result of oxidation processes. Also, an increase in the oxygen concentration in the structure leads to an increase in disorder regions, amorphization, and subsequent destruction of samples. Modified nanostructures exhibit a low rate of degradation. It is caused by a change in defects concentration after modification by an electron beam. Such a modification leads to an improvement in structural properties, a decrease in amorphous inclusions, and an increase in materials resistibility to corrosion and degradation. Analysis of the kinetics of structure failure as a result of aggressive media influence on the crystal structure of nanotubes showed that in the case of preliminary modification of nanotubes by an electron beam, nanostructures stability to degradation increases 8.33 times, which is confirmed by SEM and XRD data. The nature of the anamorphosis processes of degradation showed that for modified nanotubes a slower rate of degradation is observed. This indicates a promising possibility of using pulsed low-energy electron beams for directional modification of the crystal structure of copper nanotubes.