Abstract
Single-wall carbon nanotubes (SWNTs) were synthesized by the irradiation of a 20-ms CO2 laser pulse onto a graphite-Co/Ni (1.2 atomic %) target in an Ar gas atmosphere (600 Torr) from room temperature to 1200°C. To study the growth of SWNTs, we used emission imaging spectroscopy and shadowgraphy Wavelengthselected emission images showed that C2 emission was strong in the region close to the target (within 2 cm), while for the same region the blackbody radiation from the large clusters and/or particles increased with increasing distance from the target. Shadowgraph images revealed the formation of a mushroom or a turbulent cloud spreading slowly into the Ar atmosphere. In addition, emission imaging spectroscopy at 1200°C showed that C2 and hot clusters and/or particles with higher emission intensities distributed in much wider areas. At 1000-1200°C, the blackbody emission was observed for more than 1 s after the laser pulse. We discuss the growth dynamics of carbon-metal particles and SWNTs.
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