Abstract
Even at low concentrations, poly-aromatic hydrocarbons found in soot have substantial health implications. Soot deposits have been reported and studied using FTIR and Raman spectroscopy. Using a CO2 photolysis laser, the samples were obtained via infrared multiphoton dissociation (IRMPD) of vinyl bromide (VBr, C2H3Br) molecules. The solid deposit formed in the IRMPD of VBr when a relatively high fluence of the order of 204 J.cm−2 was analyzed by FTIR, and it was discovered that the majority of its composition is aromatic and aliphatic hydrocarbons. Significant fullerene-type carbonaceous soot particles are also found, which could correspond to C60 and C70 or other carbonaceous agglomerates of a higher order; however, the disappearance of this fullerene on Raman spectra cast doubt on this explanation. Our samples’ Raman spectroscopy has been compared to Tamor and Vassell’s research, which may indicate that they have a lesser degree of hardness and density than these authors’ results, indicating a larger hydrogen content in our samples. The optical gap has been calculated, yielding a very limited range of values ranging only between 1.0 and 1.2 eV, resulting in a crystalline size of 0.58 to 1.12 nm.
Highlights
Soot, known as black carbon, is a significant substance produced by the incomplete combustion of hydrocarbons, with a large body of research devoted to its generation, characterization, characteristics, and effects on the environment and human health [1]
We validated that the identical spectra are produced at 785 nm using an argon laser at 514.5 nm; in the first case, a significantly stronger fluorescence background emerges, for which we offer the data obtained at 785 nm. e parameters obtained for our samples, including the results of these authors for the hydrogenated samples, are shown in Figures 6(a) and 6(b)
A new approach for soot formation by infrared multiphoton dissociation (IRMPD) of VBr was applied in this study while applying a rather high fluence of the order of 204 J.cm−2
Summary
Known as black carbon, is a significant substance produced by the incomplete combustion of hydrocarbons, with a large body of research devoted to its generation, characterization, characteristics, and effects on the environment and human health [1]. Spectroscopy (i.e., Raman spectroscopy [10–12, Fourier-transform infrared spectroscopy [12,13,14], UV-vis spectroscopy [15, 16], X-ray photoelectron spectroscopy [12, 17, 18], and electron energy loss spectroscopy [19, 20]) is often used to characterize the chemical features of soot, while the microscopy (i.e., scanning probe microscopy [21,22,23], transmission electron microscopy with high resolution [20, 24], transmission electron microscopy with high resolution [25,26,27], SEM [28, 29], and helium ion microscopy [30, 31]) is used for morphological properties studies. Microscopy creates pictures of the spatial distribution of density, composition, or morphology, whereas spectroscopy determines the chemical composition and physical structures of soot. e most appropriate approach is determined by the parameter of interest and the stage of soot production in question
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