Evidence of oxygenated species in laser-irradiated carbon particles

IF 3.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL Journal of Aerosol Science Pub Date : 2024-08-03 DOI:10.1016/j.jaerosci.2024.106440
Francesca Migliorini , Roberto Dondé , Andrea Lucotti , Mauro Fasoli , Matteo Tommasini , Silvana De Iuliis
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Abstract

Combustion-generated carbon nanoparticles exhibit a variety of optical and physicochemical properties. Therefore, when applying laser diagnostic tools for monitoring purpose, it is important to consider the different response of the particles with varying properties as well as the impact of laser irradiation on these properties. In this work, we analyze the possible modification of particle optical and physicochemical properties by coupling extinction measurements with FT-IR and Raman spectroscopy. The aim is to retrieve optical, chemical, and structural properties of the particles under analysis. To our knowledge, the approach proposed in this work has not yet been performed on irradiated particles. Particles are sampled from a premixed flame at two heights above the burner, representing two different aging stages. While extinction measurements are carried out in-flow, FT-IR and Raman spectroscopy are performed on particles collected for ex-situ analysis. Moreover, the analysis is conducted on both pristine and irradiated nanoparticles with one and ten laser shots. While nascent particles do not exhibit relevant modification under laser irradiation, heating mature particles with one or more laser pulses of relatively high energy density is observed to significantly affect absorption properties, particle structures and specific surface functionalities. The presence of oxygenated species in mature particles and in particular the structures spectroscopically correlated with graphene oxide indicates that specific chemical reaction pathways can occur under laser irradiation, likely promoted in the ambient condition under analysis.

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激光照射碳颗粒中含氧物种的证据
燃烧产生的碳纳米颗粒具有多种光学和物理化学特性。因此,在应用激光诊断工具进行监测时,必须考虑不同性质颗粒的不同反应以及激光辐照对这些性质的影响。在这项工作中,我们通过将消光测量与傅立叶变换红外光谱和拉曼光谱联用,分析了颗粒的光学和物理化学特性可能发生的变化。其目的是检索被分析粒子的光学、化学和结构特性。据我们所知,这项工作中提出的方法尚未在辐照粒子上应用过。粒子从燃烧器上方两个高度的预混合火焰中取样,代表两个不同的老化阶段。在流内进行消光测量的同时,对收集的颗粒进行傅立叶变换红外光谱和拉曼光谱分析。此外,还对原始纳米颗粒和经过一次和十次激光照射的纳米颗粒进行了分析。虽然新生颗粒在激光辐照下不会出现相关的改变,但用一个或多个能量密度相对较高的激光脉冲加热成熟颗粒,会显著影响吸收特性、颗粒结构和特定的表面功能。成熟颗粒中含氧物种的存在,特别是与氧化石墨烯光谱相关的结构,表明在激光辐照下可能会发生特定的化学反应途径,这很可能在分析的环境条件下得到促进。
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来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
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