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Ethanol sensing properties and dominant sensing mechanism of NiO-decorated SnO2 nanorod sensors

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Abstract

NiO-decorated SnO2 nanorods were synthesized by the thermal evaporation of Sn powders followed by the solvothermal deposition of NiO. A multi-networked p-n heterostructured nanorod sensor was fabricated by dropping the p-NiO-decorated n-SnO2 nanorods onto the interdigited electrode pattern and then annealing. The multi-networked p-n heterostructured nanorod sensor exhibited enhanced response to ethanol compared with the pristine SnO2 nanorod and NiO nanoparticle sensors. The former also exhibited a shorter sensing time for ethanol. Both sensors exhibited selectivity for ethanol over other volatile organic compounds (VOCs) such as HCHO, methanol, benzene and toluene and the decorated sensor exhibited superior selectivity to the other two sensors. In addition, the dominant sensing mechanism is discussed in detail by comparing the sensing properties and current-voltage characteristics of a p-NiO/n-SnO2 heterostructured nanorod sensor with those of a pristine SnO2 nanorod sensor and a pristine NiO nanoparticle sensor. Of the two competing electronic mechanisms: a potential barrier-controlled carrier transport mechanism at a NiO-SnO2 p-n junction and a surface-depletion-controlled carrier transport mechanism, the former has some contribution to the enhanced gas sensing performance of the p-n heterostructured nanorod sensor, however, its contribution is not as significant as that of the latter.

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Authors and Affiliations

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

    Gun-Joo Sun, Jae Kyung Lee, Chongmu Lee & Taegyung Ko

  2. Department of Chemistry, Inha University, Incheon, 22212, Korea

    Wan In Lee

  3. School of Electrical and Computer Science Engineering, Shoolini University, Solan, Himachal Pradesh, 173229, India

    Ram Prakash Dwivedi

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  1. Gun-Joo Sun
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  2. Jae Kyung Lee
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  3. Wan In Lee
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  4. Ram Prakash Dwivedi
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  5. Chongmu Lee
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  6. Taegyung Ko
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Correspondence to Chongmu Lee or Taegyung Ko.

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Sun, GJ., Lee, J.K., Lee, W.I. et al. Ethanol sensing properties and dominant sensing mechanism of NiO-decorated SnO2 nanorod sensors. Electron. Mater. Lett. 13, 260–269 (2017). https://doi.org/10.1007/s13391-017-1719-6

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  • DOI: https://doi.org/10.1007/s13391-017-1719-6

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