Effect of orthorhombic phase on hydrogen gas sensing property of thick-film sensors fabricated by nanophase tin dioxide

Jae Pyoung Ahn, Sun Ho Kim, Jong Ku Park, Moo Young Huh

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Nanophase metallic tin powder was synthesized by an inert gas condensation method and subsequently oxidized into two types of SnO2 by two heat-treatment routes: (1) after annealing up to 900 °C in air, the synthesized powder was oxidized to form a mixture of tetragonal and orthorhombic SnO2, and (2) the synthesized powder was transformed into an amorphous tin oxide by intermediate annealing at 225 °C. The amorphous tin nano-particles were oxidized into a single phase of tetragonal SnO2 during heat treatment up to 900 °C in air. The sensitivity of the sensors fabricated from two types of nanophase SnO2 powders was evaluated by means of electrical resistance measurements. The thick-film sensors fabricated by the mixed SnO2 powder exhibited a lower sensitivity to hydrogen than those fabricated by the single tetragonal SnO2 powder. TEM observations and EPR measurements were carried out in order to interpret the role of the orthorhombic phase in gas sensing. The detrimental effect of orthorhombic SnO2 on the sensitivity was attributed to an increased number of planar defects in the microstructure and a change in species of oxygen absorbents on the surface layer of the SnO2.

Original languageEnglish
Pages (from-to)125-131
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 2003 Sept 1


  • Electron paramagnetic resonance
  • Nanophase tin dioxide
  • Orthorhombic tin dioxide
  • Thick-film sensor

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


Dive into the research topics of 'Effect of orthorhombic phase on hydrogen gas sensing property of thick-film sensors fabricated by nanophase tin dioxide'. Together they form a unique fingerprint.

Cite this