Oxalic acid sensors based on sol-gel nanostructured TiO2 films

M. Morozova*, P. Kluson, J. Krysa, Ch Gwenin, O. Solcova

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Titanium (IV) oxide semiconducting layers were prepared by means of the templated sol-gel method and deposited on conductive ITO substrates. The films were described by a series of techniques involving X-ray diffraction (XRD), Raman spectroscopy, X-ray reflectivity (XRR), atomic force microscopy (AFM), scanning electron microscopy (SEM) and ultraviolet-visible spectroscopy (UV-Vis). The photo-excitation properties of the films were characterized by electrochemical tests and evaluated from the obtained polarization curves. The generated photocurrents were measured in the presence of the hole-scavengers-oxalic acid and formic acid in the electrolyte. It was shown that especially in the case of oxalic acid the developed system can be used as an efficient and simpler concentration sensor. The relationship between values of the generated photocurrent and the layers' thicknesses was also investigated.

Original languageEnglish
Pages (from-to)175-181
Number of pages7
JournalJournal of Sol-Gel Science and Technology
Volume58
Issue number1
Early online date7 Dec 2010
DOIs
Publication statusPublished - 1 Apr 2011
Externally publishedYes

Keywords

  • Titanium oxide
  • Photo-electrochemical oxidation
  • Oxalic acid
  • Formic acid
  • Sol–Gel

Cite this