Preparation, characterization and oxygen gas sensitivity of nanosolid superacid SO4 2-/ LaCoFeO4

De Juan Lin, Shui Fa Shen, Qing Wang, Lin Jie Wang, Nai Sheng Chen, Jin Ling Huang

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

1 Citation (Scopus)

Abstract

Metal oxides have been applied in gas sensor technology while suffering poor sensitivity and high working temperature. In this work, a novel method has been adopted to improve these problems of the sensors. A mixture of Fe 3+, La3+, Co2+ (Fe3+: La3+: Co 2+ =10:3:1) and dispersing agent in water solution was precipitated by adding NH4 +(pH=9) under agitation. The precipitate was filtered, washed and drying, then immersed with 0.5M (NH4)2SO4 in 12hr. Superacid SO4 2-/ LaCoFeO4 was prepared after calcined at 673K for 1h. The thick film units for oxygen sensor were dintered at 673K for 3h.The structure of this catalyst has been characterized by means of powder X-ray diffraction (XRD), transmission electron microscope (TEM), IR, X-ray photoelectron spectroscopy (XPS) and specific surface area measurements. The result indicated that the SO4 2-/ LaCoFeO4 grain sizes (≤10nm) were smaller and the specific surface area (126M 2/g ) was higher than the pure metal oxide LaCoFeO4. The acid strength was measured by the model reaction of ethyl acetate synthesis and attributed as superacid. In addition, the SO4 2- was combined with metal ions in a bidentate fashion. The binding energy of SO 4 2-/LaCoFeO4 was larger than that of LaCoFeO4. The sensitivity as well as the working temperature is improved by comparison with the pure LaCoFeO4 phase. The relationship between the oxygen sensing properties and structure has also been discussed.

Original languageEnglish (US)
Title of host publicationMaterials Science Forum
Pages209-213
Number of pages5
Volume694
DOIs
StatePublished - 2011
Externally publishedYes
Event2011 International Conference on Frontier of Nanoscience and Technology, ICFNST 2011 - Kunming, China
Duration: Sep 28 2011Sep 29 2011

Publication series

NameMaterials Science Forum
Volume694
ISSN (Print)02555476

Other

Other2011 International Conference on Frontier of Nanoscience and Technology, ICFNST 2011
CountryChina
CityKunming
Period9/28/119/29/11

Fingerprint

Specific surface area
Oxides
Gases
Metals
Oxygen
Oxygen sensors
preparation
metal oxides
sensors
oxygen
Chemical sensors
Binding energy
gases
Thick films
X ray powder diffraction
Metal ions
Precipitates
Drying
agitation
Electron microscopes

Keywords

  • Binding energy.
  • Chelating bidentate
  • Nanosolid superacid
  • SO /LaCoFeO oxygen gas sensitivity

ASJC Scopus subject areas

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

Cite this

Lin, D. J., Shen, S. F., Wang, Q., Wang, L. J., Chen, N. S., & Huang, J. L. (2011). Preparation, characterization and oxygen gas sensitivity of nanosolid superacid SO4 2-/ LaCoFeO4 In Materials Science Forum (Vol. 694, pp. 209-213). (Materials Science Forum; Vol. 694). https://doi.org/10.4028/www.scientific.net/MSF.694.209

Preparation, characterization and oxygen gas sensitivity of nanosolid superacid SO4 2-/ LaCoFeO4 . / Lin, De Juan; Shen, Shui Fa; Wang, Qing; Wang, Lin Jie; Chen, Nai Sheng; Huang, Jin Ling.

Materials Science Forum. Vol. 694 2011. p. 209-213 (Materials Science Forum; Vol. 694).

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

Lin, DJ, Shen, SF, Wang, Q, Wang, LJ, Chen, NS & Huang, JL 2011, Preparation, characterization and oxygen gas sensitivity of nanosolid superacid SO4 2-/ LaCoFeO4 in Materials Science Forum. vol. 694, Materials Science Forum, vol. 694, pp. 209-213, 2011 International Conference on Frontier of Nanoscience and Technology, ICFNST 2011, Kunming, China, 9/28/11. https://doi.org/10.4028/www.scientific.net/MSF.694.209
Lin DJ, Shen SF, Wang Q, Wang LJ, Chen NS, Huang JL. Preparation, characterization and oxygen gas sensitivity of nanosolid superacid SO4 2-/ LaCoFeO4 In Materials Science Forum. Vol. 694. 2011. p. 209-213. (Materials Science Forum). https://doi.org/10.4028/www.scientific.net/MSF.694.209
Lin, De Juan ; Shen, Shui Fa ; Wang, Qing ; Wang, Lin Jie ; Chen, Nai Sheng ; Huang, Jin Ling. / Preparation, characterization and oxygen gas sensitivity of nanosolid superacid SO4 2-/ LaCoFeO4 Materials Science Forum. Vol. 694 2011. pp. 209-213 (Materials Science Forum).
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abstract = "Metal oxides have been applied in gas sensor technology while suffering poor sensitivity and high working temperature. In this work, a novel method has been adopted to improve these problems of the sensors. A mixture of Fe 3+, La3+, Co2+ (Fe3+: La3+: Co 2+ =10:3:1) and dispersing agent in water solution was precipitated by adding NH4 +(pH=9) under agitation. The precipitate was filtered, washed and drying, then immersed with 0.5M (NH4)2SO4 in 12hr. Superacid SO4 2-/ LaCoFeO4 was prepared after calcined at 673K for 1h. The thick film units for oxygen sensor were dintered at 673K for 3h.The structure of this catalyst has been characterized by means of powder X-ray diffraction (XRD), transmission electron microscope (TEM), IR, X-ray photoelectron spectroscopy (XPS) and specific surface area measurements. The result indicated that the SO4 2-/ LaCoFeO4 grain sizes (≤10nm) were smaller and the specific surface area (126M 2/g ) was higher than the pure metal oxide LaCoFeO4. The acid strength was measured by the model reaction of ethyl acetate synthesis and attributed as superacid. In addition, the SO4 2- was combined with metal ions in a bidentate fashion. The binding energy of SO 4 2-/LaCoFeO4 was larger than that of LaCoFeO4. The sensitivity as well as the working temperature is improved by comparison with the pure LaCoFeO4 phase. The relationship between the oxygen sensing properties and structure has also been discussed.",
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AU - Huang, Jin Ling

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AB - Metal oxides have been applied in gas sensor technology while suffering poor sensitivity and high working temperature. In this work, a novel method has been adopted to improve these problems of the sensors. A mixture of Fe 3+, La3+, Co2+ (Fe3+: La3+: Co 2+ =10:3:1) and dispersing agent in water solution was precipitated by adding NH4 +(pH=9) under agitation. The precipitate was filtered, washed and drying, then immersed with 0.5M (NH4)2SO4 in 12hr. Superacid SO4 2-/ LaCoFeO4 was prepared after calcined at 673K for 1h. The thick film units for oxygen sensor were dintered at 673K for 3h.The structure of this catalyst has been characterized by means of powder X-ray diffraction (XRD), transmission electron microscope (TEM), IR, X-ray photoelectron spectroscopy (XPS) and specific surface area measurements. The result indicated that the SO4 2-/ LaCoFeO4 grain sizes (≤10nm) were smaller and the specific surface area (126M 2/g ) was higher than the pure metal oxide LaCoFeO4. The acid strength was measured by the model reaction of ethyl acetate synthesis and attributed as superacid. In addition, the SO4 2- was combined with metal ions in a bidentate fashion. The binding energy of SO 4 2-/LaCoFeO4 was larger than that of LaCoFeO4. The sensitivity as well as the working temperature is improved by comparison with the pure LaCoFeO4 phase. The relationship between the oxygen sensing properties and structure has also been discussed.

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