Antimony-Doped Tin Dioxide Gas Sensors Exhibiting High Stability in the Sensitivity to Humidity Changes

Koichi Suematsu, Miyuki Sasaki, Nan Ma, Masayoshi Yuasa, Kengo Shimanoe

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The type and amounts of oxygen adsorption species at various atmospheric humidity levels are important factors in improving the sensitivity to combustible gases and stability to humidity changes of SnO2-based resistive-type gas sensors. We investigated the effect of antimony (Sb) doping of SnO2 nanoparticles on the stability of the sensitivity to humidity changes and oxygen adsorption species under humid atmosphere. No significant degradation of the sensitivity to hydrogen of Sb-SnO2 sensors was observed between 16 and 96 RH%, while an undoped SnO2 sensor showed gradually decreasing responses with increasing humidity. An evaluation of oxygen adsorption species under humid atmosphere showed a transition from O2- to O- with increasing humidity from 16 to 96 RH%. However, the O2- adsorption sites were maintained on the surfaces of the Sb-SnO2, even as the humidity increased. Moreover, the extent of oxygen adsorption on the Sb-SnO2 was not obviously changed with increasing humidity. These results indicate that Sb atoms function as hydroxyl absorbers and also generate O2- adsorption sites in their vicinity. Additionally, Pd loading on the Sb-SnO2 further enhanced the sensor response under humid atmosphere, while maintaining the stability to humidity changes. Therefore, we successfully imparted stability to the sensitivity of SnO2 nanoparticles during humidity changes, representing an important improvement with applications to the development of high performance, practical, resistive-type gas sensors.

Original languageEnglish
Pages (from-to)913-920
Number of pages8
JournalACS Sensors
Volume1
Issue number7
DOIs
Publication statusPublished - Jul 22 2016

Fingerprint

Tin dioxide
Antimony
antimony
Chemical sensors
dioxides
humidity
tin
Atmospheric humidity
sensitivity
sensors
gases
Adsorption
adsorption
Oxygen
oxygen
atmospheres
Sensors
Nanoparticles
stannic oxide
nanoparticles

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology
  • Instrumentation

Cite this

Antimony-Doped Tin Dioxide Gas Sensors Exhibiting High Stability in the Sensitivity to Humidity Changes. / Suematsu, Koichi; Sasaki, Miyuki; Ma, Nan; Yuasa, Masayoshi; Shimanoe, Kengo.

In: ACS Sensors, Vol. 1, No. 7, 22.07.2016, p. 913-920.

Research output: Contribution to journalArticle

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