The physical effects on the formation of polyynes by liquid laser ablation

摘要

Polyynes were prepared by laser ablation of a graphite target in deionized water changing physical parameters such as ablation wavelength (266, 355, 532, and 1064 nm), power, and time in order to elucidate their effects on the carbon chain length and formation efficiency of polyynes. We analyzed the UV-Vis spectra of polyyne solutions and examined the branching ratios of C_6H_2, C_8H_2, and C_(10)H_2 as well as their concentrations at different ablation conditions. It turned out that the amount of polyynes increased with the ablation laser wavelength while the branching ratios were highly wavelength-dependent.