Article Abstract:
Single-wall carbon nanotubes (SWNTs) were produced through the irradiation of a 20-ms CO2 laser pulse onto a graphite-Co/Ni composite target at 25-1200 degrees C. Characterization of carbonaceous deposits revealed that SWNTs were formed by laser irradiation even at room temperature. It is proposed that the growth of the SWNT occurs from a liquid-like carbon-metal particle through supersaturation and segregation. A continuous supply of hot carbon clusters to the particles due to the 20-ms laser pulse and the maintenance of the hot growth zone for the SWNTs have a significant role in the SWNT formation.
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Article Abstract:
A study was conducted to analyze the electronic structure of copper nanoparticles, copper fibers and polycrystalline copper metal. Copper samples were dispersed in water and subjected to ultrasonic treatment. Results indicated a negative core-level binding energy shift for copper nanoparticles. There was also an increase in work function for copper fibers as compared with those of the polycrystalline copper.
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Article Abstract:
A new method for controlling the diameters of single-wall carbon nanotubes (SWNTs) by changing the pressure of helium gas in which the arc discharge was generated is presented. It was possible to measure nuclear magnetic resonance spectra of SWNTs even though the metal catalysts remained in the sample.
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