...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical chemistry chemical physics: PCCP >Surface features of TiO2 nanoparticles: combination modes of adsorbed CO probe the stepping of (101) facets
【24h】

Surface features of TiO2 nanoparticles: combination modes of adsorbed CO probe the stepping of (101) facets

机译：TiO2纳米颗粒的表面特征：吸附的CO的结合模式探测（101）面的台阶

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Integrated studies of CO adsorption on TiO2 materials of different morphology and surface complexity identify, for the first time, frustrated translational CO modes by detecting their combination with the CO stretching mode (vCO). All the considered materials exhibit IR spectra with low-intensity bands in the 2235-2205 cm~(-1) range, a region where components due to strong Lewis acid Ti~(4+) sites may be present as well. These observations lead to a powerful method for associating high-wavenumber bands to TiO2 surface features and interpreting IR spectra of drastically complex/defective TiO2 materials. The proposed band assignment is based on vibrational analyses of CO-TiO2 theoretical models, indicating that the frustrated translational mode with frequency in the 30-50 cm-1 range involved in the observed combination bands is perpendicular to the Ti~(4+) rows. Our results reveal that this low-energy CO mode is much more sensitive than vCO in probing the TiO2 surface topography, and that its higher-energy components can be specifically associated with the presence of steps on the (101) faces. In a broader perspective, the frustrated translational CO mode surface sensitivity could become a key tool for detecting specific defective sites on TiO2 surfaces.
机译：对不同形态和表面复杂性的TiO2材料上的CO吸附的综合研究，首次发现了平移的CO模式与CO拉伸模式（vCO）的组合，从而发现了沮丧的平移CO模式。所有考虑的材料均显示出2235-2205 cm〜（-1）范围内的低强度谱带的IR光谱，在该区域中也可能存在由于强路易斯酸Ti〜（4+）位导致的组分。这些发现导致了一种强大的方法，可以将高波数带与TiO2表面特征相关联并解释剧烈复杂/有缺陷的TiO2材料的红外光谱。提议的能带分配基于对CO-TiO2理论模型的振动分析，表明观察到的组合能带中涉及的频率在30-50 cm-1范围内的沮丧平移模式垂直于Ti〜（4+）行。我们的结果表明，在探测TiO2表面形貌时，这种低能量的CO模式比vCO敏感得多，并且其较高能量的成分可以与（101）面上台阶的存在相关。从更广泛的角度来看，沮丧的平移CO模式表面灵敏度可能会成为检测TiO2表面特定缺陷部位的关键工具。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号