Time evolution of emission by carbon nanoparticles generated with a laser furnace technique

Time evolution of emission by carbon nanoparticles generated with a laser furnace technique was investigated with a high-speed video camera. Assuming blackbody radiation formula for small spherical particle, the internal temperature of these carbon nanoparticles was determined as a function of time delay (Δt) after laser vaporization. It was found that the internal temperature of them drastically decreased at Δt < 400μs through collision with the surrounding rare gas inside the furnace. On the other hand, in particular laser vaporization condition where yields of C₆₀ and other higher fullerenes in the soot were found to be high, an increase in the blackbody emission intensity could be recognized for longer wavelength ( 660 < λ < 830 nm) at Δt > 400μs. This finding suggests that a certain exothermic process related to the formation of C₆₀ and other higher fullerenes should occur at Δt > 400μs inside the furnace.