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X-ray photoelectron spectroscopic analysis of the surface chemistry of silica nanowires

机译：二氧化硅纳米线表面化学的X射线光电子能谱分析

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摘要

A thorough analysis of the surface chemistry of silica nanowires has been performed by X-ray photo-electron spectroscopy to investigate unexpected surface changes. Examination of the Si 2p, O 1s, and C Is core level states before and after exposure of the nanowires to various liquid media showed that silica nanowires are capable of much higher surface hydroxyl concentrations than planar native oxides. It is further demonstrated that the nanowire surface hydroxyl concentration corresponds to the pH of the aqueous media to which the nanowires are exposed. Spectral feature changes due to water exposure similar to those observed for fibronectin binding suggests that fibronectin binding is competitively inhibited by slow changes in surface chemistry resulting from water exposure.
机译：通过X射线光电子能谱对二氧化硅纳米线的表面化学进行了彻底的分析，以研究意想不到的表面变化。在将纳米线暴露于各种液体介质之前和之后对Si 2p，O 1s和Cs的核水平状态的检查表明，二氧化硅纳米线比平面天然氧化物具有更高的表面羟基浓度。进一步证明，纳米线表面羟基浓度对应于纳米线暴露于其中的水性介质的pH。由于暴露于水而引起的光谱特征变化与纤连蛋白结合所观察到的相似，表明纤连蛋白的结合被暴露于水的表面化学的缓慢变化竞争性地抑制。

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  • 来源
    《Applied Surface Science》 |2011年第13期|p.5766-5771|共6页
  • 作者

    Miles F. BeauxII; Nathan J. Bridges; Morgan DeHart; Thomas E. Bitterwolf; David N. Mcllroy;

  • 作者单位

    Department of Physics, University of Idaho, Moscow, ID 83844, USA,BANTech Initiative (Biological Applications of Nanotechnologies), University of Idaho, Moscow, ID 83844, USA;

    Department of Physics, University of Idaho, Moscow, ID 83844, USA,BANTech Initiative (Biological Applications of Nanotechnologies), University of Idaho, Moscow, ID 83844, USA;

    Department of Physics, University of Idaho, Moscow, ID 83844, USA,BANTech Initiative (Biological Applications of Nanotechnologies), University of Idaho, Moscow, ID 83844, USA;

    Department of Chemistry, University of Idaho, Moscow, ID 83844, USA;

    Department of Physics, University of Idaho, Moscow, ID 83844, USA,BANTech Initiative (Biological Applications of Nanotechnologies), University of Idaho, Moscow, ID 83844, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanowire; Surface chemistry; Silica; XPS;

    机译：纳米线;表面化学;二氧化硅;XPS;

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