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Surface-adsorbate-induced fluorescence-type Raman background of Pb(Zr0.4Ti0.6)O3nanotubes

Authors
Journal
Current Applied Physics
1567-1739
Publisher
Elsevier
Volume
12
Issue
5
Identifiers
DOI: 10.1016/j.cap.2012.03.009
Keywords
  • Pzt Nanotubes
  • Surface Adsorbates
  • Raman Scattering
Disciplines
  • Physics

Abstract

Abstract We report the effects of adsorbates on the Raman spectra of Pb(Zr0.4Ti0.6)O3 nanotubes (PZT-NTs). PZT-NTs with adsorbates were prepared by exposing PZT-NTs to air for 1 day. We found that the presence of surface adsorbates can cause an intense and broad Raman background that hinders the observation of the Raman vibrational modes of the PZT-NTs. This background can be suppressed by adjusting the Raman excitation wavelength from 514.5nm to 414.6nm. It can also be removed by post-annealing the PZT-NTs at 500°C, but it returns readily after re-exposure to air. X-ray photoelectron and Fourier transform infrared spectroscopies show that hydroxyl and carbonate groups are adsorbed onto the surfaces of the PZT-NTs during exposure to air. Moreover, dispersive Raman spectra reveal that the background is a tail of a very broad band from 1000 to 4000cm−1, which corresponds to hydroxyl groups. These results suggest that the main contribution to the Raman background of the PZT-NTs is that of surface hydroxyl groups rather than carbonate groups.

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