FTIR and Raman Spectroscopy Study of Soot Deposits Produced in the Infrared Multiphoton Dissociation of Vinyl Bromide

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-02-25 DOI:10.1155/2022/9942870

B. Samoudi, O. Bendaou, I. Hanafi, A. Asselman, K. Haboubi

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引用次数: 4

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.

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乙烯基溴红外多光子解离过程中烟灰沉积的FTIR和拉曼光谱研究

即使在低浓度下，煤烟中发现的多芳烃也会对健康产生重大影响。利用红外光谱和拉曼光谱对烟尘沉积进行了报道和研究。利用CO2光解激光，对乙烯基溴(VBr, C2H3Br)分子进行红外多光子解离(IRMPD)得到样品。在较高的204j量级的影响下，VBr的IRMPD中形成固体沉积。对cm−2进行了红外光谱分析，发现其主要成分为芳香烃和脂肪烃。富勒烯型碳质煤烟颗粒明显，可能对应C60、C70或其他更高阶的碳质团聚体;然而，这种富勒烯在拉曼光谱上的消失使人们对这种解释产生了怀疑。我们样品的拉曼光谱已经与Tamor和Vassell的研究进行了比较，这可能表明它们的硬度和密度程度比这些作者的结果要低，这表明我们样品中的氢含量更高。计算了光学间隙，得到的值范围非常有限，仅在1.0到1.2 eV之间，导致晶体尺寸为0.58到1.12 nm。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.