中国物理B ›› 2016, Vol. 25 ›› Issue (2): 26801-026801.doi: 10.1088/1674-1056/25/2/026801

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Vibrational features of confined water in nanoporous TiO2 by Raman spectra

Xin Gao(高欣), Qiang Wang(王强), Gang Sun(孙刚), Chen-Xi Li(李晨曦), Lin Hu(胡林)   

  1. 1. College of Science, Guizhou University, Guiyang 550025, China;
    2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2015-08-01 修回日期:2015-11-01 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Xin Gao E-mail:gaoxin0526@163.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11304049 and 11264006), the Guizhou Provincial Science and Technology Foundation, China (Grant No. J[2010]2132), and the Doctor Funds of Guizhou University, China (Grant No. [2012] 020).

Vibrational features of confined water in nanoporous TiO2 by Raman spectra

Xin Gao(高欣)1, Qiang Wang(王强)2, Gang Sun(孙刚)2, Chen-Xi Li(李晨曦)2, Lin Hu(胡林)1   

  1. 1. College of Science, Guizhou University, Guiyang 550025, China;
    2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-08-01 Revised:2015-11-01 Online:2016-02-05 Published:2016-02-05
  • Contact: Xin Gao E-mail:gaoxin0526@163.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11304049 and 11264006), the Guizhou Provincial Science and Technology Foundation, China (Grant No. J[2010]2132), and the Doctor Funds of Guizhou University, China (Grant No. [2012] 020).

摘要:

Raman spectra of confined water adsorbed in nanoporous TiO2 are obtained in experiment. TiO2 samples with different pore diameters under different humidity conditions are investigated. The results indicate that the symmetric vibrational mode of water molecule is destroyed when relative humidity decreases. This indicates that the interaction between water molecules and surface of TiO2 becomes stronger when the distance between water molecules and surface turns smaller, and the interaction plays a major role in depressing the symmetric vibrational peak. The spectra of confined water in TiO2 and Vycor are compared. When filling fractions are the same, their spectra show distinctions no matter whether they are in partial filling condition or in full filling condition. The spectra of HDO confined in TiO2 with different filling fractions are compared with each other. There is no clear distinction among their vibrational peaks, and the peaks mainly relate to asymmetric vibration. Therefore, the interaction between water molecules and the wall of pore decouples the symmetric vibrational mode only, and the influences on asymmetric vibrational mode show little differences among different filling fractions.

关键词: porous titanium dioxide, confined water, Raman spectrum, asymmetric vibration

Abstract:

Raman spectra of confined water adsorbed in nanoporous TiO2 are obtained in experiment. TiO2 samples with different pore diameters under different humidity conditions are investigated. The results indicate that the symmetric vibrational mode of water molecule is destroyed when relative humidity decreases. This indicates that the interaction between water molecules and surface of TiO2 becomes stronger when the distance between water molecules and surface turns smaller, and the interaction plays a major role in depressing the symmetric vibrational peak. The spectra of confined water in TiO2 and Vycor are compared. When filling fractions are the same, their spectra show distinctions no matter whether they are in partial filling condition or in full filling condition. The spectra of HDO confined in TiO2 with different filling fractions are compared with each other. There is no clear distinction among their vibrational peaks, and the peaks mainly relate to asymmetric vibration. Therefore, the interaction between water molecules and the wall of pore decouples the symmetric vibrational mode only, and the influences on asymmetric vibrational mode show little differences among different filling fractions.

Key words: porous titanium dioxide, confined water, Raman spectrum, asymmetric vibration

中图分类号:  (Liquid-solid interfaces)

  • 68.08.-p
33.20.Fb (Raman and Rayleigh spectra (including optical scattering) ?) 33.20.Tp (Vibrational analysis)