Design of highly sensitive C2H5oH sensors using self-assembled ZnO nanostructures

Kang Min Kim, Hae Ryong Kim, Kwon Il Choi, Hyo Joong Kim, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Various ZnO nanostructures such as porous nanorods and two hierarchical structures consisting of porous nanosheets or crystalline nanorods were prepared by the reaction of mixtures of oleic-acid-dissolved ethanol solutions and aqueous dissolved Znprecursor solutions in the presence of NaOH. All three ZnO nanostructures showed sensitive and selective detection of C2H5OH. In particular, ultra-high responses (Ra/Rg = ~1,200, Ra: resistance in air, Rg: resistance in gas) to 100 ppm C2H5OH was attained using porous nanorods and hierarchical structures assembled from porous nanosheets, which is one of the highest values reported in the literature. The gas response and linearity of gas sensors were discussed in relation to the size, surface area, and porosity of the nanostructures.

Original languageEnglish
Pages (from-to)9685-9699
Number of pages15
JournalSensors
Volume11
Issue number10
DOIs
Publication statusPublished - 2011 Oct

Keywords

  • Gas sensor
  • Hierarchical structures
  • Nanostructures
  • Self-assembly
  • ZnO

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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