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 journalArticlepeer-review

    25 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

    • Materials Chemistry
    • General Chemical Engineering
    • Polymers and Plastics
    • Organic Chemistry

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