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Electronic Materials Letters

, Volume 13, Issue 3, pp 260–269 | Cite as

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

  • Gun-Joo Sun
  • Jae Kyung Lee
  • Wan In Lee
  • Ram Prakash Dwivedi
  • Chongmu LeeEmail author
  • Taegyung KoEmail author
Article
First Online:

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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Keywords

p-n junction heterostructure gas sensor ethanol sensing mechanism 
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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringInha UniversityIncheonKorea
  2. 2.Department of ChemistryInha UniversityIncheonKorea
  3. 3.School of Electrical and Computer Science EngineeringShoolini UniversitySolanIndia

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