R.L. Vander Wal, C.K. Gaddam
Penn State University, United States
pp. 141 - 143
Keywords: laser, high-temperature, carbon, transformation
Pulsed laser annealing of nanocarbons, with focus upon soot was performed using a Nd:YAG laser operating at 1064 nm and laser fluence of 250 mJ/cm2. A gated intensified CCD captured the spectra of the material incandescence, fitting the spectral profile yielded a temperature of 2800 K for this laser fluence. To resolve detailed morphological and nanostructural changes induced in the soot by pulsed high intensity laser light, high resolution transmission electron microscopy (HRTEM) was used to examine the laser-heated soot. The annealing process accentuated the recognizable structural differences and led to graphitization of lamellae, but the spatial organization of lamellae was quite different across these soots. Initial nanostructure in conjunction with the chemistry of construction governed the material transformation under pulsed laser annealing.