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Adsorption Kinetics and Dynamics of Small Molecules on Graphene and Graphene Oxide

机译：小分子在石墨烯和氧化石墨烯上的吸附动力学和动力学

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摘要

Graphene is an allotrope of carbon composed of sp2 hybridized carbon and arranged into a honeycomb lattice. Graphene is a mechanically strong material (200 times stronger than steel) and has high carrier mobility, high thermal conductivity, and high optical transparency. Owing to these outstanding properties graphene is used in many applications; often graphene is used on a support instead as a free-standing graphene. When graphene is utilized it can adsorb many molecules and this adsorption could be influenced by the support. Furthermore, comparing the adsorption of such molecules on the support alone and on the supported graphene (graphene on the support) could provide details on the transparency of graphene; transparency can be defined as the identical interactions of a molecule on a supported graphene and the respective support. Therefore, this dissertation focused on studying the adsorption kinetics and dynamics of selected molecules (water, benzene, n-alkane, and carbon dioxide) on two different types of graphene: chemical vapor deposited (CVD) and physical vapor deposited (PVD) graphene. In addition, the chemically inert graphene was functionalized with oxygen to produce graphene oxide and the reactivity of graphene oxide on carbon dioxide adsorption was studied. All the experiments were carried at ultrahigh vacuum conditions to ensure an atomically clean environment.;The PVD graphene was synthesized on Ru(0001) and was further functionalized with oxygen to produce graphene oxide. The surface characterizations were carried out by various surface analytical techniques: Auger electron spectroscopy (AES), low energy electron diffraction (LEED), and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics and dynamics were studied by thermal desorption spectroscopy (TDS) and molecular beam scattering techniques, respectively. Transparency of graphene, support effects, and the reactivity of graphene oxide were mapped. The studies clearly showed that the transparency of graphene depends on the polarizability of the molecule and the supports; the supports indeed influenced the adsorption of molecules on graphene. In addition, graphene oxide did not react with CO2 to produce any reaction products but it enhanced the CO2 adsorption.
机译：石墨烯是一种碳的同素异形体，由sp2杂化碳组成，排列成蜂窝状晶格。石墨烯是一种机械强度高的材料（比钢强200倍），并且具有较高的载流子迁移率，较高的导热性和较高的光学透明性。由于这些突出的特性，石墨烯被用于许多应用中。通常将石墨烯用于支撑物，而不是用作独立式石墨烯。当使用石墨烯时，它可以吸附许多分子，并且这种吸附可能受到载体的影响。此外，比较此类分子在单独的载体上和在负载的石墨烯（载体上的石墨烯）上的吸附，可以提供有关石墨烯透明度的详细信息。透明性可以定义为分子在负载的石墨烯和相应的载体上的相同相互作用。因此，本论文着重研究所选分子（水，苯，正构烷烃和二氧化碳）在两种不同类型的石墨烯上的吸附动力学和动力学：化学气相沉积（CVD）和物理气相沉积（PVD）石墨烯。另外，将化学惰性的石墨烯用氧气官能化以生产氧化石墨烯，并研究了氧化石墨烯对二氧化碳吸附的反应性。所有实验均在超高真空条件下进行，以确保原子清洁的环境。; PVD石墨烯在Ru（0001）上合成，并进一步用氧气官能化以生产氧化石墨烯。表面表征通过各种表面分析技术进行：俄歇电子能谱（AES），低能电子衍射（LEED）和X射线光电子能谱（XPS）。吸附动力学和动力学分别通过热解吸光谱（TDS）和分子束散射技术进行了研究。绘制了石墨烯的透明度，支撑作用和氧化石墨烯的反应性。研究清楚地表明，石墨烯的透明度取决于分子和载体的极化率。载体确实影响了分子在石墨烯上的吸附。另外，氧化石墨烯不与CO 2反应以产生任何反应产物，但是它增强了CO 2的吸附。

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  • 作者

    Sivapragasam, Nilushni.;

  • 作者单位

    North Dakota State University.;

  • 授予单位 North Dakota State University.;
  • 学科 Physical chemistry.
  • 学位 Ph.D.
  • 年度 2018
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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