Facile Synthesis of p-type Perovskite SrTi0.65Fe 0.35O3-δ Nanofibers Prepared by Electrospinning and Their Oxygen-Sensing Properties

Seung Hoon Choi, Seon Jin Choi, Byoung Koun Min, Woon Young Lee, Jin Seong Park, Il Doo Kim

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Quaternary p-type SrTi0.65Fe0.35O3-δ (STFO) nanofibers with diameters ranging from 70 to 500 nm were synthesized via electrospinning and subsequent calcination at 750 °C. The STFO fibers showed single perovskite structure and polycrystalline fiber morphologies composed of small nanocrystallites in the range of 10-12 nm. The semiconducting oxygen sensor using STFO fiber network exhibited a wide temperature-independence of resistance (≈12 ± 4 kΩ) that exceeded the range of 600-950 °C, high oxygen response (RO2/RN2= 4.08 at 20% O 2), and a fast response time (t = 2.1 s at 20% O2) upon cyclic oxygen exposure. These superior properties were attributed to the high surface-to-volume ratio of STFO fiber network and the effective diffusion of oxygen gas onto highly porous STFO-sensing layers. Quaternary p-type SrTi 0.65Fe0.35O3- δ (STFO) nanofibers with polycrystalline structure are synthesized via electrospinning and used as high-sensitivity oxygen-sensing layers.

Original languageEnglish
Pages (from-to)521-527
Number of pages7
JournalMacromolecular Materials and Engineering
Volume298
Issue number5
DOIs
Publication statusPublished - 2013 May

Keywords

  • SrTiFe O
  • electrospinning
  • nanofibers
  • oxygen sensors

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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