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Characterization Of High Temperature Conductive Graphite Surfaces Irradiated With Femtosecond Laser Pulses

机译：飞秒激光脉冲辐照的高温导电石墨表面的表征

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摘要

In this study high temperature conductive graphite surfaces irradiated with megahertz pulse repetition rate femtosecond laser pulses under ambient condition were characterized using electron microscopy and spectroscopy techniques. Scanning electron microscopy analysis of the treated surface shows formation of self assembled weblike nanofibrous structure in and around the laser irradiated spots. Further transmission electron microscopy investigation revealed that this structure was formed due to aggregation of graphite nanoparticles. In addition the broadening of microraman peaks at 1340 and 1580 cm1 of the laser irradiated sample was due to confinement of optical phonons in graphite nanoparticles. X-ray photoelectron spectroscopy analysis shows a marginal increase of sp2 and sp3 species with laser treated samples as compared to that of untreated samples. The results show that femtosecond laser treatment is rather a simple technique for the direct synthesis graphite nanostructures without significant changes in their chemistry as compared to the bulk.
机译：在这项研究中，使用电子显微镜和光谱技术对在环境条件下以兆赫兹脉冲重复频率飞秒激光脉冲辐照的高温导电石墨表面进行了表征。对处理过的表面的扫描电子显微镜分析表明，在激光照射的斑点内和周围形成了自组装的网状纳米纤维结构。进一步的透射电子显微镜研究表明该结构是由于石墨纳米颗粒的聚集而形成的。另外，激光辐照样品在1340和1580 cm1处的显微拉曼峰的展宽是由于石墨纳米颗粒中光子的局限。 X射线光电子能谱分析显示，与未经处理的样品相比，经激光处理的样品中sp2和sp3种类略有增加。结果表明，飞秒激光处理是直接合成石墨纳米结构的简单技术，与本体相比，化学性质没有明显变化。

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  • 来源
    《Applied Surface Science》 |2011年第23期|p.9780-9784|共5页
  • 作者

    M. Sivakumar; B. Tan; K. Venkatakrishnan;

  • 作者单位

    Department of Sciences, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Ettimadai, Coimbatore, 641112, India Department of Aerospace Engineering Ryerson University, 350 Victoria Street, Toronto, ON MSB 2K3, Canada;

    Department of Aerospace Engineering Ryerson University, 350 Victoria Street, Toronto, ON MSB 2K3, Canada;

    Department of Mechanical and Industrial Engineering Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nanoparticles aggregate; Femtosecond laser; Laser ablation;

    机译：纳米粒子聚集;飞秒激光;激光烧蚀;

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