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Carbon nanotubes (CNTs), due to mechanical, electrical, and surface area properties and their ability to adapt to different nanocomposite structures, are very substantial in supercapacitor electrodes. In this review, we have summarized high-performance, flexible, and symmetry CNT supercapacitors based on the CNTs/graphene, CNTs/metal, and CNTs/polymer electrodes. To present recent developments in CNT supercapacitors, we discuss the performance of supercapacitors based on electrical properties such as specific capacitance (SC), power and energy densities, and capacitance retention (CR). The comparison of supercapacitor nanocomposite electrodes and their results are reported for future researchers.

The FePt crystal phase transition to L10 requires a temperature of about 600 °C, but at this temperature the nanoparticles forming the samples gradually become bulk-like. To prevent interlocking of FePt nanoparticles at high temperature, the electron flux effect can be considered. It is a new and useful method for heat treatment of FePt nanoparticles. Actually, the existence of excess electrons is effective in limiting the increase of particle size. In this work, experimental and theoretical investigations have been performed to study the effect of electron irradiation during heat treatment on particle size. The experimental results show that the particle diameter at 700 °C does not exceed 300–400 nm in the presence of electron flux.

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