Facile Synthesis of p-type Perovskite SrTi0.65Fe0.35O3-δ Nanofibers Prepared by Electrospinning and Their Oxygen-Sensing Properties
- Facile Synthesis of p-type Perovskite SrTi0.65Fe0.35O3-δ Nanofibers Prepared by Electrospinning and Their Oxygen-Sensing Properties
- Seung-Hoon Choi; Seon-Jin Choi; 민병권; Woon Young Lee; Jin Seong Park; 김일두
- Nanofibers; Electrospinning; oxygen sensors; SrTi0.65Fe0.35O3-δ
- Issue Date
- Macromolecular materials and engineering
- VOL 298, NO 5, 521-527
- 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 ( = 4.08 at 20% O2), 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.
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