Semiconducting SnO2-TiO2 (S-T) composites for detection of SO2 gas

Suresh Mulmi, Venkataraman Thangadurai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

SnO2-TiO2 (S-T) composites with different molar ratios were prepared by mechanical mixing followed by sintering at 700 °C for 4 h in air. The structural and microstructural properties of the composites were investigated using powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). S-T composites were investigated by introducing SO2 to test their chemical stability using PXRD and SEM coupled with energy dispersive X-ray (EDX) analysis. The sensing performance was measured at different temperatures using various SO2 concentrations (10–100 ppm). A composite comprising 25 mol% of SnO2 and 75 mol% TiO2 (S25-T75) exhibited the highest sensitivity comparing to other S-T composites studied under the presently investigated conditions. t90 (90 % of response time) was found to be ∼5 min for thick pellet (~2 mm in thickness). SO2 sensing mechanism has been explained through the band structure model.

Original languageEnglish
Pages (from-to)1927-1935
Number of pages9
JournalIonics
Volume22
Issue number10
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Composites
  • Gas sensors
  • n-n junction
  • Selectivity
  • Semiconductors
  • SnO-TiO
  • SO sensor

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