Sensing and structural properties of Ti-doped tin oxide (SnO2) membrane for bio-sensor applications

A. Panimaya Selvi Isabel, Chyuan Haur Kao*, Rama Krushna Mahanty, Yew-Chuhg Wu, Chung Yi Li, Chan Yu Lin, Chun Fu Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We investigated the effect of rapid thermal annealing (RTA) on the sensing and structural characteristics of Ti-doped SnO2 based electrolyte-insulator-semiconductor (EIS) pH sensors. The Ti-doped Tin oxide (SnO2) EIS sensor annealed at 700 °C post deposition annealing, exhibits the best sensing characteristics in terms of sensitivity, linearity, hysteresis and drift rate. This derives from Ti incorporation that improves the thin-film stoichiometry by reducing dangling bonds on the dielectric surface and improves the temperature stability. We further studied the structural, compositional, and morphological characteristics of the deposited thin-film. RTA treatment increases the sensitivity and linearity by creating larger grain size and higher number of surface sites. Sodium (Na+) and potassium (K+) sensing performance was also measured using the fabricated EIS sensors.

Original languageEnglish
Pages (from-to)10386-10391
Number of pages6
JournalCeramics International
Volume43
Issue number13
DOIs
StatePublished - 1 Jan 2017

Keywords

  • Sensing membrane
  • SnO
  • Ti-doped

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