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Improved Graphitic Structure of Continuous Carbon Nanofibers via Graphene Oxide Templating

机译：通过氧化石墨烯模板改善连续碳纳米纤维的石墨结构

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摘要

Continuous carbon nanofibers (CNF) present an attractive building block for a variety of multifunctional materials and devices. However, the carbonization of poly(acrylonitrile) (PAN) precursors usually results in CNFs with poor graphitic structure and, consequently, modeston-optimized properties. This paper reports that the graphitic structure of CNFs can be improved with an addition of a small amount of graphene oxide into PAN prior to processing. Continuous CNFs with 1.4 wt% of graphene oxide nanoparticles are prepared from PAN solutions by electrospinning, stabilized, and carbonized at 800℃, 1200℃, and 1850℃. While the as-prepared graphene oxide-filled PAN nanofibers exhibit a considerable reduction in polymer crystallinity, Raman analysis of the carbonized nanofibers shows that both templating with graphene oxide and increasing the carbonization temperature significantly improve the graphitic order in CNFs. The effect of graphene oxide is more significant at higher carbonization temperatures. Selected area electron diffraction analysis of individual nanofibers reveals increased graphitic order and preferred orientation both in the vicinity of visible graphene oxide nanoparticles and in the regions where nanoparticles were not visible. These results indicate a possibility of global templating in CNFs, where the addition of a small amount of graphene oxide nanoparticles can template the formation of good, preferentially oriented graphitic crystallites in CNFs, leading to improved structure and mechanical and transport properties.
机译：连续碳纳米纤维（CNF）为各种多功能材料和设备提供了有吸引力的基础。然而，聚（丙烯腈）（PAN）前体的碳化通常会导致CNF的石墨结构不佳，从而导致适度/未优化的性能。本文报道，在加工之前，在PAN中添加少量氧化石墨烯可以改善CNF的石墨结构。由PAN溶液通过电纺，稳定化和在800℃，1200℃和1850℃下碳化而制备具有1.4 wt％氧化石墨烯纳米颗粒的连续CNF。尽管所制备的填充氧化石墨烯的PAN纳米纤维表现出相当大的聚合物结晶度降低，但碳化纳米纤维的拉曼分析显示，既用氧化石墨烯进行模板化又提高碳化温度都可以显着改善CNF中的石墨顺序。在较高的碳化温度下，氧化石墨烯的作用更为显着。单个纳米纤维的选定区域电子衍射分析显示，在可见的氧化石墨烯纳米颗粒附近以及在纳米颗粒不可见的区域中，石墨顺序和优先取向均增加。这些结果表明在CNF中进行全局模板化的可能性，其中添加少量的氧化石墨烯纳米颗粒可以模板化CNF中良好的，优先取向的石墨微晶的形成，从而改善结构以及机械和传输性能。

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  • 来源
    《Advanced Functional Materials》 |2013年第46期|5763-5770|共8页
  • 作者

    Dimitry Papkov; Alexander Goponenko; Owen C. Compton; Zhi An; Alexander Moravsky; Xing-Zhong Li; SonBinh T. Nguyen; Yuris A. Dzenis;

  • 作者单位

    Department of Mechanical and Materials Engineering Nebraska Center for Materials and Nanoscience University of Nebraska-Lincoln Lincoln, NE 68588-0526, USA;

    Department of Mechanical and Materials Engineering Nebraska Center for Materials and Nanoscience University of Nebraska-Lincoln Lincoln, NE 68588-0526, USA;

    Department of Chemistry Northwestern University Evanston, IL 60208, USA;

    Department of Chemistry Northwestern University Evanston, IL 60208, USA;

    MER Corporation, 7960 South Kolb Road Tucson, AZ 85706, USA;

    Nebraska Center for Materials and Nanoscience University of Nebraska Lincoln, NE 68588, USA;

    Department of Chemistry Northwestern University Evanston, IL 60208, USA;

    E. I. DuPont de Nemours and Company, Inc., Central Research & Development, Experimental Station, Wilmington, DE 19880, USA;

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