Experimental studies of O2-SnO2 surface interaction using powder, thick films and monocrystalline thin films

S. Saukko, Ulla Lassi, V. Lantto, M. Kroneld, S. Novikov, P. Kuivalainen, T. T. Rantala, J. Mizsei

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Surface properties of solids and the interactions between molecules and solid surfaces are important for many technical applications. They also involve a range of physical and chemical phenomena of fundamental scientific interest. The importance of oxygen chemistry at SnO2 surfaces follows from the fact that SnO2 is used as an active material in gas sensor applications. The operation principle of these sensors is usually based on measurable conductance response of the material, which is understood in terms of reactions of gas molecules with different oxygen species adsorbed onto the surface. The role of the lattice oxygen, but in particular, the bridging oxygen atoms on SnO2 surfaces, is also active. Detailed understanding of the reaction mechanisms of various oxygen species at SnO2 surfaces is important, as it offers a way to improve the sensitivity and selectivity of the sensors. Oxygen adsorption-desorption kinetics at the SnO2 surface is studied experimentally using O2-temperature-programmed desorption (TPD) method together with conductance measurements in the case of SnO2 powder and polycrystalline thick films made from the powder. In addition, CO-TPD is studied and the transient behaviour of various oxygen species is considered. Molecular beam epitaxy (MBE) was also used to fabricate polycrystalline and monocrystalline thin films with the SnO2(101) face on single crystal sapphire substrate. Simultaneous surface potential and conductance measurements during heating and cooling in different ambient atmospheres were used to characterize the monocrystalline SnO2(101) surface after various surface treatments.

Original languageEnglish
Pages (from-to)48-53
Number of pages6
JournalThin Solid Films
Volume490
Issue number1
DOIs
Publication statusPublished - Oct 21 2005

Fingerprint

Thick films
Powders
surface reactions
thick films
Oxygen
Thin films
thin films
oxygen
Temperature programmed desorption
desorption
sensors
Molecules
Aluminum Oxide
Sensors
Surface potential
Carbon Monoxide
Chemical sensors
Molecular beam epitaxy
Sapphire
Surface properties

Keywords

  • Gas sensor
  • Molecular beam epitaxy (MBE)
  • Temperature-programmed desorption (TPD)
  • Tin dioxide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Experimental studies of O2-SnO2 surface interaction using powder, thick films and monocrystalline thin films. / Saukko, S.; Lassi, Ulla; Lantto, V.; Kroneld, M.; Novikov, S.; Kuivalainen, P.; Rantala, T. T.; Mizsei, J.

In: Thin Solid Films, Vol. 490, No. 1, 21.10.2005, p. 48-53.

Research output: Contribution to journalArticle

Saukko, S, Lassi, U, Lantto, V, Kroneld, M, Novikov, S, Kuivalainen, P, Rantala, TT & Mizsei, J 2005, 'Experimental studies of O2-SnO2 surface interaction using powder, thick films and monocrystalline thin films', Thin Solid Films, vol. 490, no. 1, pp. 48-53. https://doi.org/10.1016/j.tsf.2005.04.012
Saukko, S. ; Lassi, Ulla ; Lantto, V. ; Kroneld, M. ; Novikov, S. ; Kuivalainen, P. ; Rantala, T. T. ; Mizsei, J. / Experimental studies of O2-SnO2 surface interaction using powder, thick films and monocrystalline thin films. In: Thin Solid Films. 2005 ; Vol. 490, No. 1. pp. 48-53.
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