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Macroscopic Properties of Restacked, Redox-Liquid Exfoliated Graphite and Graphite Mimics Produced in Bulk Quantities

机译:大量堆积的氧化还原液剥落石墨和模仿石墨的宏观特性

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摘要

The excellent properties exhibited by monolayer graphene have spurred the development of exfoliation techniques using bulk graphite to produce large quantities of pristine monolayer sheets. Development of simple chemistry to exfoliate and intercalate graphite and graphite mimics in large quantities is required for numerous applications. To determine the macroscopic behavior of restacked, exfoliated bulk materials, a systematic approach is presented using a simple, redox-liquid sonication process along to obtain large quantities of 2D and 3D hexagonally layered graphite, molybdenum disulfide, and boron nitride, which are subsequently characterized to observe chemical and structural changes. For MoS_2 sonicated with the antioxidant sodium bisulfite, results from Raman spectroscopy, X-ray diffraction, and electron microscopy indicate the presence of distorted phases from different polymorphs, and apparent nanotube structures in the bulk, restacked powder. Furthermore, using thermograviemtric analysis, the antioxidant enhances the resistance to oxidative degradation of MoS_2, upon thermal treatment up to 900 ℃. The addition of the ionic antioxidant decreased dispersion stability in non-polar solvent, suggesting decreased compatibility with non-polar systems. Using simple chemical methods, the ability to generate tailored multidimensional layered materials with unique macroscopic properties is critical for numerous applications, including electrical devices, reinforced polymer composites, lithium-ion capacitors, and chemical sensing.
机译:单层石墨烯表现出的优异性能刺激了使用块状石墨生产大量原始单层片材的剥离技术的发展。对于许多应用,需要开发简单的化学方法以大量剥落和嵌入石墨及石墨模拟物。为了确定重新堆积,脱落的散装材料的宏观行为,提出了一种系统的方法,该方法使用简单的氧化还原-液体超声处理工艺来获得大量的2D和3D六角形层状石墨,二硫化钼和氮化硼,随后对其进行表征观察化学和结构变化。对于用抗氧化剂亚硫酸氢钠超声处理的MoS_2,拉曼光谱,X射线衍射和电子显微镜的结果表明,在不同的多晶型物中存在扭曲的相,并且在散装的堆积粉末中存在明显的纳米管结构。此外,通过热重分析,抗氧化剂增强了MoS_2的抗氧化降解能力,经过900℃以下的热处理。离子型抗氧化剂的添加降低了在非极性溶剂中的分散稳定性,表明与非极性体系的相容性降低。使用简单的化学方法,能够生成具有独特的宏观特性的量身定制的多维层状材料的能力对于众多应用至关重要,包括电气设备,增强型聚合物复合材料,锂离子电容器和化学传感。

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  • 来源
    《Advanced Functional Materials》 |2014年第31期|4969-4977|共9页
  • 作者单位

    Department of Chemistry University of Tennessee Knoxville, Tennessee 37996, USA;

    Materials and Power Systems Branch Naval Surface Warfare Center Carderock Division West Bethesda Maryland 20817, USA;

    Department of Chemistry University of Tennessee Knoxville, Tennessee 37996, USA;

    Department of Biochemistry and Cellular and Molecular Biology University of Tennessee Knoxville, Tennessee 37996, USA;

    Department of Chemistry University of Tennessee Knoxville, Tennessee 37996, USA;

    Department of Chemistry University of Tennessee Knoxville, Tennessee 37996, USA;

    Department of Chemistry University of Tennessee Knoxville, Tennessee 37996, USA,Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, USA;

    Department of Materials Science and Engineering University of Tennessee Knoxville, Tennessee 37996, USA;

    Department of Chemistry University of Tennessee Knoxville, Tennessee 37996, USA,Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, USA;

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