Thermally Stimulated and Dynamic Effects in Identification and Study of Carbon Materials by Raman Spectroscopy

IF 0.4 Q4 MULTIDISCIPLINARY SCIENCES
S. Isaenko, T. Shumilova
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Abstract

In this paper, the aspects of studying micron-sized carbon material substances using Raman spectroscopy with laser excitation were discussed. The relevance of the study is determined by the fact that the positions of diagnostic lines in the Raman spectra of carbon materials are significantly affected as the analyzed sample region is heated during the process of spectra recording, thereby resulting in a shift of the diagnostic lines and bands, up to the burnout of the analyzed particle region or to the complete combustion of the sample. To assess the influence of the laser radiation power on the position of diagnostic lines in the Raman spectra of carbon materials, we studied the position of the lines depending on the laser power and sample size of both natural and man-made carbon phases of various structures: highly crystalline graphite, glassy carbon, cubic monocrystalline diamond, hexagonal monocrystalline diamond (lonsdaleite), and ultrananocrystalline diamond. The study was performed by Raman spectroscopy with the use of a high-resolution LabRam HR800 microspectrometer (Horiba, Jobin Yvon). For mono-, nano-, and ultrananocrystalline diamonds, a number of examples were provided to demonstrate that the exciting laser power during Raman spectroscopy measurements of carbon materials must be especially carefully monitored in particles of 10 μm or less in size. For highly crystalline graphite particles, the laser power must be controlled in samples smaller than 4 μm in size. When the Raman spectra were registered during the controlled laser heating, it was found that the samples of a black carbon vari-ety between coal and diamond (described as togorite by V.A. Yezersky V.A. (1986)) had intergrowths of diamond and glassy carbon, a diamond core with a glass-like carbon shell. The results obtained show that the controlled use of the thermal effect of laser radiation can be helpful in identification of the detailed spectroscopic characteristics that occur during the intensive heating of samples, as well as in recovering mineral individuals from aggregates.
热刺激和动态效应在拉曼光谱识别和研究碳材料中的应用
本文讨论了利用激光激发拉曼光谱研究微米级碳材料物质的几个方面。由于在光谱记录过程中被分析的样品区域被加热,从而导致诊断线和谱带的移位,直至被分析的颗粒区域燃尽或样品完全燃烧,从而显著影响了碳材料拉曼光谱中诊断线的位置,从而决定了本研究的相关性。为了评估激光辐射功率对碳材料拉曼光谱诊断线位置的影响,我们研究了不同结构的天然和人造碳相的激光功率和样本量对诊断线位置的影响:高晶石墨、玻璃碳、立方单晶金刚石、六方单晶金刚石(lonsdaleite)和超晶金刚石。本研究采用拉曼光谱,使用高分辨率LabRam HR800微光谱仪(Horiba, Jobin Yvon)。对于单晶、纳米和超晶金刚石,提供了许多例子来证明,在碳材料的拉曼光谱测量过程中,必须特别仔细地监测尺寸为10 μm或更小的颗粒的激发激光功率。对于高结晶石墨颗粒,激光功率必须控制在小于4 μm的样品中。当在受控激光加热过程中记录拉曼光谱时,发现煤和金刚石之间的一种黑碳(由V.A. Yezersky V.A.(1986)描述为togorite)的样品具有金刚石和玻璃碳的共生体,即具有玻璃状碳壳的金刚石核。结果表明,有控制地利用激光辐射的热效应可以帮助识别样品在密集加热过程中发生的详细光谱特征,以及从团聚体中回收矿物个体。
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
CiteScore
0.70
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0.00%
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审稿时长
17 weeks
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