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首页> 外文学位 >Characterization and growth analysis of two types of thin films formed on copper surfaces: An inorganic chromium containing film and an organic film formed via reduction of diazonium ions.
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Characterization and growth analysis of two types of thin films formed on copper surfaces: An inorganic chromium containing film and an organic film formed via reduction of diazonium ions.

机译：在铜表面上形成的两种类型薄膜的特性和生长分析：无机铬含量的膜和通过重氮离子还原形成的有机膜。

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摘要

Surface enhanced Raman scattering was used to observe interactions of dilute CrVI solutions with silver and copper surfaces in situ. Using silver as a model surface, CrIII was observed at the near monolayer level, and the spectra were compared to those from CrIII oxyhydroxide species and CrIII/Cr VI mixed oxide. Similar experiments were conducted with copper surfaces and 785 nm excitation. Upon exposure of a copper surface to CrVI solution, the characteristic copper oxide Raman bands disappeared, and a Cr III band increased in intensity over a period of ∼20 hours. The intensity of the CrIII band on copper became self limiting after the formation of several CrIII monolayers, as supported by chronoamperometry experiments. This CrIII spectrum was stable after CrVI was removed from the solution provided the potential remained negative of -200 mV vs. Ag/AgCl. The results support the conclusion that CrVI is reductively adsorbed to copper at the near neutral pH and open circuit potentials expected for Cu/Al alloys in field applications. The CrIII film is stable and strongly inhibits oxygen reduction at the treated copper surface.; Copper surfaces and polished Aluminum Alloy 2024 T3 substrates were derivatized at open circuit potential with arenediazonium salts in both aprotic and aqueous media. Raman spectroscopy confirmed the presence of a derivatized film on the substrates before and after exposure to boiling water and sonication in acetone. Preliminary experiments to test these films for corrosion inhibition proved unsuccessful. Aluminum and copper substrates were prepared and used for x-ray photoelectron spectroscopy (XPS) analysis of the derivatization results. In the copper experiments, one surface was native oxide copper, predominantly in the form of Cu2O, and one surface was predominantly Cu 0. Results of the XPS analysis indicate the presence of a Cu-O-C linkage and possibly a Cu-C covalent bond between the aryl ring and the copper substrate. XPS results also indicate the formation of multilayers on both types of copper surfaces with different percentages of azo coupling within the multilayers on the two surfaces. These easily prepared, covalently bonded organic films could be used for applications currently fulfilled with self-absorbed monolayers and Langmuir Blodgett films.
机译：使用表面增强拉曼散射观察稀CrVI溶液与原位银和铜表面的相互作用。使用银作为模型表面，在接近单层水平上观察到CrIII，并将光谱与CrIII羟基氧化物和CrIII / Cr VI混合氧化物的光谱进行比较。在铜表面和785 nm激发下进行了类似的实验。将铜表面暴露于CrVI溶液后，特有的氧化铜拉曼谱带消失，并且Cr III谱带在约20小时内强度增强。计时电流法实验证明，在形成多个CrIII单层后，铜上CrIII带的强度变得自限。从溶液中除去CrVI后，此CrIII光谱是稳定的，条件是电位相对于Ag / AgCl保持为负-200 mV。结果支持以下结论：六价铬在接近中性pH的条件下被还原性吸附到铜上，并且有望在现场应用中获得铜/铝合金的开路电势。 CrIII膜是稳定的，并强烈抑制了处理过的铜表面的氧还原。铜表面和抛光的铝合金2024 T3基材在非质子介质和水性介质中均以苯二氮杂鎓盐在开路电势下衍生化。拉曼光谱法证实了在暴露于沸水和在丙酮中超声处理之前和之后衬底上存在衍生化膜。测试这些膜的腐蚀抑制作用的初步实验证明是不成功的。准备了铝和铜基板，并将其用于衍生化结果的X射线光电子能谱（XPS）分析。在铜实验中，一个表面是天然氧化物铜，主要为Cu2O形式，一个表面主要为Cu0。XPS分析的结果表明之间存在Cu-OC键和可能存在Cu-C共价键芳基环和铜底物。 XPS结果还表明在两种类型的铜表面上都形成了多层，在两个表面上的多层中偶氮偶联的百分比不同。这些易于制备，共价键合的有机膜可用于目前具有自吸收单层膜和Langmuir Blodgett膜的应用。

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  • 作者

    Hurley, Belinda Louise.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Chemistry Analytical.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 222 p.
  • 总页数 222
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;工程材料学;
  • 关键词

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