Excellent ethanol sensing properties based on Er2O3-Fe2O3 nanotubes

doi:10.1088/1674-1056/24/11/118501

Abstract

In this work, pure α-Fe₂O₃ and Er₂O₃-Fe₂O₃ nanotubes were synthesized by a simple single-capillary electrospinning technology followed by calcination treatment. The morphologies and crystal structures of the as-prepared samples were characterized by scanning electron microscopy and x-ray diffraction, respectively. The gas-sensing properties of the as-prepared samples have been researched, and the result shows that the Er₂O₃-Fe₂O₃ nanotubes exhibit much better sensitivity to ethanol. The response value of Er₂O₃-Fe₂O₃ nanotubes to 10 ppm ethanol is 21 at the operating temperature 240°, which is 14 times larger than that of pure α-Fe₂O₃ nanotubes (response value is 1.5). The ethanol sensing properties of α-Fe₂O₃ nanotubes are remarkably enhanced by doping Er, and the lowest detection limit of Er₂O₃-Fe₂O₃ nanotubes is 300 ppb, to which the response value is about 2. The response and recovery times are about 4 s and 70 s to 10 ppm ethanol, respectively. In addition, the Er₂O₃-Fe₂O₃ nanotubes possess good selectivity and long-term stability.

Keywords: Er₂O₃ α-Fe₂O₃ nanotubes ethanol gas sensing

Received: 09 April 2015
Revised: 19 June 2015
Accepted manuscript online:

PACS:	85.85.+j	(Micro- and nano-electromechanical systems (MEMS/NEMS) and devices)
	85.35.-p	(Nanoelectronic devices)
	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)

Fund:

Project supported by Jilin Provincial Science and Technology Department, China (Grant No. 20140204027GX) and the Challenge Cup for College Students, China (Grant No. 450060497053).

Corresponding Authors: Liu Chang-Bai
E-mail: liwei99@jlu.edu.cn

Cite this article:

Liu Chang-Bai (刘唱白), He Ying (何滢), Wang Sheng-Lei (王圣蕾) Excellent ethanol sensing properties based on Er₂O₃-Fe₂O₃ nanotubes 2015 Chin. Phys. B 24 118501

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Excellent ethanol sensing properties based on Er2O3-Fe2O3 nanotubes

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Excellent ethanol sensing properties based on Er₂O₃-Fe₂O₃ nanotubes