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首页> 外文期刊>Applied Surface Science >Surface characterization of NCD films as a function of sp~2/sp~3 carbon and oxygen content
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Surface characterization of NCD films as a function of sp~2/sp~3 carbon and oxygen content

机译：NCD薄膜的表面表征与sp〜2 / sp〜3碳和氧含量的函数

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摘要

The wettability of nanocrystalline diamond was systematically studied using water by sessile-drop method for films grown with different concentrations of methane addition in the Ar/CH_4/H_2 mixtures. These films showed diamond grains agglomerate, also called ballas diamond, which presented a decrease on film roughness from 230 to 12 nm associated to a contact angle decrease from 97° to 73°, as the methane concentration increased from 0.5 to 2.0 vol.%. Considering the wettability evolution is only due to a chemical surface modification, it could be reasonably proposed that the progressive loss of the hydrophobic character is linked to the progressive increase of surface terminations with oxygen (carbonyl or carboxyl). This result is coherent with the observed from the deconvolution of XPS spectra, where the total oxygen amount increased from 5 to 14% and the sp~3/sp~2 carbon ratio decreased from 7.6 to 6.9 as the methane concentration increased. Moreover, the stress behaviour, analyzed by Raman spectroscopy, was explained pointed out the nanodiamondanographite transition process due to the methane increase in the gas phase.
机译：用水通过无滴法系统研究了纳米晶金刚石的润湿性，研究了在Ar / CH_4 / H_2混合物中甲烷添加浓度不同的情况下生长的薄膜。这些膜显示出金刚石颗粒附聚体，也称为巴拉斯金刚石，随着甲烷浓度从0.5vol。％增加到2.0vol。％，其膜粗糙度从230nm减小到12nm，并且接触角从97°减小到73°。考虑到润湿性的发展仅是由于化学表面的修饰，可以合理地提出，疏水性的逐渐丧失与氧气（羰基或羧基）表面终止的逐步增加有关。该结果与XPS光谱解卷积观察到的结果一致，随着甲烷浓度的增加，总氧气含量从5％增加到14％，sp〜3 / sp〜2碳比从7.6降低到6.9。此外，解释了通过拉曼光谱分析的应力行为，指出由于气相中甲烷的增加，纳米金刚石/纳米石转变过程。

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  • 来源
    《Applied Surface Science》 |2009年第14期|6565-6570|共6页
  • 作者

    A.F.Azevedo; J.T. Matsushima; F.C. Vicentin; M.R. Baldan; N.G. Ferreira;

  • 作者单位

    Institute National de Pesquisas Espaciais, Laboratorio Assotiado de Sensores e Materials, Av. dos Astronautas 1758, Jd. Granja, SJCampos, SP/12245-970, Brazil;

    Institute National de Pesquisas Espaciais, Laboratorio Assotiado de Sensores e Materials, Av. dos Astronautas 1758, Jd. Granja, SJCampos, SP/12245-970, Brazil;

    Laboratorio National de Luz Sincrotron, Caixa Postal. 6192, Campinas, SP/13083-970, Brazil;

    Institute National de Pesquisas Espaciais, Laboratorio Assotiado de Sensores e Materials, Av. dos Astronautas 1758, Jd. Granja, SJCampos, SP/12245-970, Brazil;

    Institute National de Pesquisas Espaciais, Laboratorio Assotiado de Sensores e Materials, Av. dos Astronautas 1758, Jd. Granja, SJCampos, SP/12245-970, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    nanocrystalline; diamond film; contact angle measurements; X-ray photoelectron spectroscopy (XPS); atomic force microscopy (AFM); raman scattering spectroscopy;

    机译：纳米晶金刚石膜接触角测量;X射线光电子能谱（XPS）;原子力显微镜（AFM）;拉曼散射光谱;

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