Analysis of growth characteristic and structure morphology of carbonaceous PM within a flame by laser Raman spectroscopy

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To clarify the behavior of carbonaceous PM (soot) within adiffusion flame, soot growth and oxidation history was evaluated based on spatial distributions of polycyclic aromatic hydrocarbons (PAHs), soot and OH within a flame obtained by laser spectroscopy. Furthermore, soot was sampled along the flame axis byusing a sampling probe. Soot nanostructure such as graphitic crystallite size and amorphous carbon content was characterized by using laser Raman spectroscopy. The soot Raman spectra show that both graphitic crystallite size and amorphous carbon content insoot were increasing during the soot growth process. Meanwhile in the soot oxidationprocess by OH, the crystallite size and the amorphous carbon content decreasesimultaneously. These results suggest that the soot formation and oxidation history withinthe flame strongly affects the soot nanostructure.