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Fe2O3/Co3O4 composite nanoparticle ethanol sensor

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Abstract

In this study Fe2O3/Co3O4 nanocomposites were synthesized by using a simple hydrothermal route. The X-ray diffraction analysis results showed that the synthesized powders were pure and nanocrystalline in nature. Moreover, scanning electron microscopy revealed that Fe2O3 nanoparticles had spherical shapes while Co3O4 particles had a rod-like morphology. The ethanol sensing properties of Fe2O3/Co3O4 nanocomposites were examined and compared with those of pristine Fe2O3 nanoparticles. The gas sensing properties of Fe2O3/Co3O4 nanocomposites were shown to be superior to those of pristine Fe2O3 nanoparticles and for all concentrations of ethanol, the response of the nanocomposite sensor was shown to be higher than that of the pristine Fe2O3 nanoparticle sensor. In detail, the response of the Fe2O3/Co3O4 nanocomposite sensor to 200 ppm of ethanol at 300 ◦C was about 3 times higher than that of pristine sensor. Also, in general, the response and recovery times of the Fe2O3/Co3O4 nanocomposite sensor were shorter than those of the pristine one. The improved sensing characteristics of the Fe2O3/Co3O4 sensor were attributed to a combination of several effects: the formation of a potential barrier at the Fe2O3-Co3O4 interface, the enhanced modulation of the conduction channel width accompanying the adsorption and desorption of ethanol gas, the catalytic activity of Co3O4 for the oxidation of ethanol, the stronger oxygen adsorption of p-type Co3O4, and the formation of preferential adsorption sites.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Shiraz University, Shiraz, Iran

    Ali Mirzaei

  2. Department of Materials Science and Engineering, Inha University, Incheon, 22212, Korea

    Sunghoon Park, Gun-Joo Sun, Hyejoon Kheel & Chongmu Lee

  3. Department of Electronic Engineering, Inha University, Incheon, 22212, Korea

    Sangmin Lee

Authors
  1. Ali Mirzaei
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  2. Sunghoon Park
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  3. Gun-Joo Sun
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  4. Hyejoon Kheel
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  5. Chongmu Lee
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  6. Sangmin Lee
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Correspondence to Chongmu Lee.

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Mirzaei, A., Park, S., Sun, GJ. et al. Fe2O3/Co3O4 composite nanoparticle ethanol sensor. Journal of the Korean Physical Society 69, 373–380 (2016). https://doi.org/10.3938/jkps.69.373

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  • DOI: https://doi.org/10.3938/jkps.69.373

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