Irradiations of the nanostructured silicon with Si+ and He+ ions were carried out with energies of 200 and 150 keV, respectively. Raman scattering showed destruction of the structure after irradiations and accumulation of defects at different fluences of irradiation. It is shown that monocrystalline silicon films are amorphized under irradiation at 0.7 displacement per atom. However, porous silicon does not completely amorphize at 0.5 displacement per atom, a weak signal is observed in the Raman spectra corresponding to the amorphous silicon phase, and at the same time there is an obvious signal from the crystalline phase of silicon. The size of nanocrystallites in the structure of porous silicon was estimated at different fluences of irradiation.
The possibility of using polymer composite materials based on epoxy resins with the inclusion of carbon nanotubes as coatings with a low coefficient of secondary electron emission has been studied. Four types of samples were obtained: epoxy polymer, polymer composites with fillers (non-oriented and oriented carbon nanotubes, carbon soot). It is shown that the secondary electron emission yield depends on the structure of the introduced carbon filler, and polymer composites with oriented nanotubes exhibit antidynatron properties.
This paper presents the results of experiment to change wettability of commercial multi-walled carbon nanotubes (MWCNTs) Taunit-MD after irradiation with 120 keV Ar+ ions with various fluences. Using the Raman spectroscopy and scanning electron microscopy, the structure of the irradiated MWCNTs was investigated and X-ray microanalysis was carried out. The dependences of the average diameter of the MWCNTs, the concentration of O2 in the samples, and the defectiveness of the MWCNTs on the irradiation fluence, as well as their effect on the wettability angle with distilled water, ethylene glycol and cyclohexane are considered. The possibility and prospects of using ion-beam modification methods for the controlled change of the wetting angle in order to create a hydrophobic or hydrophilic MWCNTs coating to various types of liquids are discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.