Synthesis of alkali-metal-doped C_(60) nanotubes

摘要

C_(60) nanotubes have been synthesized by a solution-solution method. After degassing in a dynamic vacuum, the C_(60) nanotubes doped with alkali metals by means of vapor evaporation method. Different temperatures have been studied to evaporate the alkali metals for the doping experiments. Raman spectrum was further employed to analyze the doping concentration of the obtained samples. It was found that all three alkali metals (Li, Na and K) used can be efficiently doped into the C_(60) nanotubes, forming A_xC_(60) nanotubes. The doping concentration of Li, Na changed from low to high level, depending on the experiment temperatures, while K doping always gave saturated doping. The melt points, the ionic sizes and vapor pressures of alkali metals were thought to affect the final doping results.