Highly sensitive and ultra-fast responding gas sensors using self-assembled hierarchical SnO2 spheres

Hae Ryong Kim, Kwon Il Choi, Jong Heun Lee, Sheikh A. Akbar

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)


The Sn3O4 hierarchical microspheres self-assembled from nanosheets were prepared by a hydrothermal reaction of aqueous solution containing SnCl2·2H2O, H2C2O4, HCl, and N2H4·H2O, which were successfully transformed into nano-porous SnO2 hierarchical microspheres for gas sensor applications by heat treatment at 600 °C. The morphology of building blocks within the SnO2 hierarchical spheres could be manipulated from 0-dimensional nanoparticles to 2-dimensional nanosheets by varying the amount of H2C2O4 and N2H4·H2O. The SnO2 hierarchical spheres showed both the ultra-fast response (∼1 s) and high sensitivity to 50 ppm C2H5OH. The dramatic improvement in gas sensing characteristics was explained by the rapid diffusion of the target gas onto the entire sensing materials through the nano-porous network of nanosheets.

Original languageEnglish
Pages (from-to)138-143
Number of pages6
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2009 Feb 2


  • Fast response
  • Gas sensors
  • Hierarchical spheres
  • Hydrothermal synthesis
  • SnO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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