Performance evaluation of an oxygen sensor as a function of the Samaria doped ceria film thickness

Rahul P. Sanghavi, M. Nandasiri, S. Kuchibhatla, P. Nachimuthu, M. H. Engelhard, V. Shutthanandan, W. Jiang, S. Thevuthasan, A. Kayani, S. Prasad

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The current demand in the automobile industry is in the control of air-fuel mixture in the combustion engine of automobiles. Oxygen partial pressure can be used as an input parameter for regulating or controlling systems in order to optimize the combustion process. Our goal is to identify and optimize the material system that would potentially function as the active sensing material for such a device that monitors oxygen partial pressure in these systems. We have used thin film Samaria doped ceria (SDC) as the sensing material for the sensor operation, exploiting the fact that at high temperatures, oxygen vacancies generated due to samarium doping act as conducting medium for oxygen ions which hop through the vacancies from one side to the other contributing to an electrical signal. We have recently established that 6 atom % Sm doping in ceria films has optimum conductivity. Based on this observation, we have studied the variation in the overall conductivity of 6 atom % Samaria doped ceria thin films as a function of thickness in the range of 50 nm to 300 nm at a fixed bias voltage of 2 volts. A direct proportionality in the increase in the overall conductivity is observed with the increase in sensing film thickness. For a range of oxygen pressure values from 0.001 Torr to 100 Torr, a tolerable hysteresis error, good dynamic response and a response time of less than 10 seconds was observed.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages107-112
Number of pages6
Volume1209
Publication statusPublished - 2010
Externally publishedYes
Event2009 MRS Fall Meeting - Boston, MA
Duration: 29 Nov 20092 Dec 2009

Other

Other2009 MRS Fall Meeting
CityBoston, MA
Period29/11/092/12/09

Fingerprint

Oxygen sensors
Cerium compounds
Film thickness
film thickness
Oxygen
evaluation
automobiles
sensors
oxygen
Partial pressure
conductivity
partial pressure
Doping (additives)
Samarium
Thin films
Atoms
samarium
Oxygen vacancies
thin films
Bias voltage

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Sanghavi, R. P., Nandasiri, M., Kuchibhatla, S., Nachimuthu, P., Engelhard, M. H., Shutthanandan, V., ... Prasad, S. (2010). Performance evaluation of an oxygen sensor as a function of the Samaria doped ceria film thickness. In Materials Research Society Symposium Proceedings (Vol. 1209, pp. 107-112)

Performance evaluation of an oxygen sensor as a function of the Samaria doped ceria film thickness. / Sanghavi, Rahul P.; Nandasiri, M.; Kuchibhatla, S.; Nachimuthu, P.; Engelhard, M. H.; Shutthanandan, V.; Jiang, W.; Thevuthasan, S.; Kayani, A.; Prasad, S.

Materials Research Society Symposium Proceedings. Vol. 1209 2010. p. 107-112.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sanghavi, RP, Nandasiri, M, Kuchibhatla, S, Nachimuthu, P, Engelhard, MH, Shutthanandan, V, Jiang, W, Thevuthasan, S, Kayani, A & Prasad, S 2010, Performance evaluation of an oxygen sensor as a function of the Samaria doped ceria film thickness. in Materials Research Society Symposium Proceedings. vol. 1209, pp. 107-112, 2009 MRS Fall Meeting, Boston, MA, 29/11/09.
Sanghavi RP, Nandasiri M, Kuchibhatla S, Nachimuthu P, Engelhard MH, Shutthanandan V et al. Performance evaluation of an oxygen sensor as a function of the Samaria doped ceria film thickness. In Materials Research Society Symposium Proceedings. Vol. 1209. 2010. p. 107-112
Sanghavi, Rahul P. ; Nandasiri, M. ; Kuchibhatla, S. ; Nachimuthu, P. ; Engelhard, M. H. ; Shutthanandan, V. ; Jiang, W. ; Thevuthasan, S. ; Kayani, A. ; Prasad, S. / Performance evaluation of an oxygen sensor as a function of the Samaria doped ceria film thickness. Materials Research Society Symposium Proceedings. Vol. 1209 2010. pp. 107-112
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