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Discrete Co catalytic nanoparticles with small diameters are obtained by pulsed vacuum arc evaporation on Si/SiO2 substrates, which are used for the growth of isolated single-walled carbon nanotubes (SWNTs) by an ethanol chemical vapor deposition approach (CVD). The distributions of catalytic nanoparticles change with the number of arc pulses, which allows control of the nanotubes formation. We find...
Abstract. The positron lifetime of undoped Liquid-Encapsulated Czochralski (LEC)-GaAs and Si-doped (1.31018cm3) LEC-GaAs was measured before and after irradiation with protons (dose 11015/cm2, 15MeV). In Si-doped GaAs, the decrease of positron lifetime at temperatures between 10 and 300K are due to the decrease of the positron-diffusion length and the increase of the effective shallow traps such as...
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