Mesoporous silica thin films for alcohol sensors

Plinio Innocenzi*, Alessandro Martucci, Massimo Guglielmi, Andrea Bearzotti, Enrico Traversa, Jean Claude Pivin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Silica mesoporous films using cetyltrimethylammonium bromide surfactant as a template have been prepared. The films have been deposited on silicon and alumina substrates by dip-coating and calcined at 250 and 450°C. The films were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy and Rutherford backscattering spectrometry. The films have been shown to maintain the mesophase after calcination, at 250°C the presence of residual surfactant has been observed. A density of 1.46 and 1.65 g cm-3 has been measured by Rutherford backscattering spectrometry in the 250 and 450°C calcined samples, respectively. These densities are much lower than the value (2.07 g cm-3) measured in a reference silica film obtained via sol-gel and with the same thermal history. The electrical response of the silica mesoporous films has been investigated with different concentrations of alcohols. The sensitivity of the material to changes in the atmospheres of ethanol, methanol, 2-propanol, butanol-1 and exane has been tested. The results have shown a large sensitivity to the alcohols at room temperature and the possibility to discriminate between the different alcoholic species.

Original languageEnglish (US)
Pages (from-to)1985-1988
Number of pages4
JournalJournal of the European Ceramic Society
Volume21
Issue number10-11
DOIs
StatePublished - Aug 31 2001

Keywords

  • Films
  • Sensors
  • SiO
  • Sol-gcl processes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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