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We studied engine-out soot samples collected from a heavy-dutydirect-injection diesel engine and a port-fuel injection gasolinespark-ignition engine. The two types of soot samples were characterized usingRaman spectroscopy with different laser power. A Matlab program usingleast-square-method with trust-region-reflective algorithm was developed forcurve fitting. We used a DOE (design of experiments) method to avoid localconvergence. This method was used for two-band fitting and three-band fitting.The fitting results were used to determine the intensity ratio of D and G Ramanbands. We find that high laser power may cause oxidation of soot samples, whichgives higher D/G intensity ratio. Diesel soot has consistently higheramorphous/graphitic carbon ratio and thus higher oxidation reactivity, incomparison to gasoline soot, which is revealed by the higher D/G intensityratio in Raman spectra measured under the same laser power.

Raman Spectroscopy of Diesel and Gasoline Engine-Out Soot Using Different Laser Power