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Concentration of Nitric Acid Strongly Influences Chemical Composition of Graphite Oxide

机译:硝酸浓度强烈影响石墨氧化物的化学成分

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摘要

Graphite oxide is the most widely used precursor for the synthesis of graphene through top-down methods. We demonstrate a significant influence of nitric acid concentration on the structure and composition of the graphite oxide prepared by graphite oxidation. In general, two main chlorate-based oxidation methods are currently used for graphite oxide synthesis: the Staudenmaier method using 98 wt% nitric acid, and the Hofmann method with 68 wt% nitric acid. However, a gradual change in nitric acid concentration allows a continuous change in the graphite oxide composition. The prepared samples are thoroughly characterised by microscopic techniques as well as various spectroscopic and analytical methods. Lowering the nitric acid concentration leads to an increase in oxidation degree, and in particular, to the concentration of epoxy and hydroxyl groups. This knowledge is not only useful for the large-scale synthesis of graphite oxide with tuneable size and chemical composition, but the use of nitric acid in lower concentrations can also reduce the overall cost of the synthesis significantly.
机译:石墨氧化物是通过自上而下方法合成石墨烯的最广泛使用的前体。我们证明了硝酸浓度对石墨氧化制备的石墨氧化物结构和组成的显着影响。通常,目前两种主要的氯酸盐基氧化方法用于石墨氧化物合成:使用98wt%硝酸的Staudenmaier方法,以及具有68wt%硝酸的Hofmann方法。然而,硝酸浓度的逐渐变化允许石墨氧化物组合物的连续变化。通过微观技术以及各种光谱和分析方法彻底表征制备的样品。降低硝酸浓度导致氧化度的增加,特别是环氧和羟基的浓度。这种知识不仅可用于具有可调谐尺寸和化学成分的石墨氧化物的大规模合成,但在较低浓度下使用硝酸也可以显着降低合成的总成本。

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  • 来源
    《Chemistry: A European journal》 |2017年第26期|共9页
  • 作者单位

    Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 (Czech Republic) Fax: (+420) 22431-0422;

    Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 (Czech Republic) Fax: (+420) 22431-0422;

    Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 (Czech Republic) Fax: (+420) 22431-0422;

    Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 (Czech Republic) Fax: (+420) 22431-0422;

    Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 (Czech Republic) Fax: (+420) 22431-0422;

    Division of Chemistry &

    Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 (Singapore);

    Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 (Czech Republic) Fax: (+420) 22431-0422;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    electrochemistry; graphene; graphene oxide; graphite oxide; nitric acid;

    机译:电化学;石墨烯;石墨烯;石墨氧化物;硝酸;

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