Raman study of the soft modification of graphene by femtosecond laser irradiation

IF 2.4 3区 化学 Q2 SPECTROSCOPY Journal of Raman Spectroscopy Pub Date : 2024-01-02 DOI:10.1002/jrs.6647
Diego Soto-Puebla, Susana Alvarez-Garcia
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Abstract

Processing a graphene surface by irradiation with a fs-pulsed laser at energies below the ablation threshold allows the production of non-thermally modified regions with slightly different properties than pristine graphene. Oxidized nanoislands, optical forging, and nanopore networks are modifications of the graphene structure recently reported using a wide range of fs-laser energies. In this work, we first determined the pulse energy threshold of a fs-laser for the ablation of a commercial CVD graphene sample. Then we irradiated the sample in an extended range of pulse energies relative to the ablation threshold value. The irradiation process was simultaneously monitored by Raman spectroscopy, and the evolution of each Raman parameter (central position, bandwidth, and intensity) was analyzed. Special attention was given to the pulse energy that produced linear relationships between most Raman parameter pairs. These linear correlations evidence the interrelation between multiple Raman parameters and a soft processing method applicable to the controlled modification of the graphene lattice.

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飞秒激光照射石墨烯软改性的拉曼研究
用能量低于烧蚀阈值的fs脉冲激光照射石墨烯表面进行处理,可以产生与原始石墨烯特性略有不同的非热学修饰区域。氧化纳米岛、光学锻造和纳米孔网络是最近报道的使用各种fs激光能量对石墨烯结构进行的改性。在这项工作中,我们首先确定了用于烧蚀商用 CVD 石墨烯样品的 fs 激光脉冲能量阈值。然后,我们在相对于烧蚀阈值的更大脉冲能量范围内对样品进行辐照。拉曼光谱同时监测了辐照过程,并分析了每个拉曼参数(中心位置、带宽和强度)的演变。特别关注的是脉冲能量,它在大多数拉曼参数对之间产生了线性关系。这些线性关系证明了多个拉曼参数之间的相互关系,以及一种适用于石墨烯晶格受控改性的软处理方法。
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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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