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2003•Journal of Beijing University of Chemical TechnologyRequires access

Preparation and gas-sensing properties of nanosized α-Fe_2O_3

Yan Tao

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Abstract

Nanosized α-Fe_2O_3 powders was prepared by the precipitation method and a thick film of α-Fe_2O_3 based sensor was fabricated. The phase composition, grain size and the particle size distribution of α-Fe_2O_3 sample were studied by TG-DTA, TEM and zetasize distribution analysis. The effects of the doped noble metals or carbonate and the calcination temperature on the sensitivity of sensors were studied. The results show that the particles of α-Fe_2O_3 are in the nanometer size range, and α-Fe_2O_3 calcinated at 600?℃ and doped with 3% noble metal or SrCO_3 presents the best sensitivity to CO.

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What this paper is about

Nanosized α-Fe_2O_3 powders was prepared by the precipitation method and a thick film of α-Fe_2O_3 based sensor was fabricated. The phase composition, grain size and the particle size distribution of α-Fe_2O_3 sample were studied by TG-DTA, TEM and zetasize distribution analysis. The effects of the doped noble metals or carbonate and the calcination temperature on the sensitivity of sensors were studied. The results show that the particles of α-Fe_2O_3 are in the nanometer size range, and α-Fe_2O_3 calcinated at 600?℃ and doped with 3% noble metal or SrCO_3 presents the best sensitivity to CO.

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Available abstract

Nanosized α-Fe_2O_3 powders was prepared by the precipitation method and a thick film of α-Fe_2O_3 based sensor was fabricated. The phase composition, grain size and the particle size distribution of α-Fe_2O_3 sample were studied by TG-DTA, TEM and zetasize distribution analysis. The effects of the doped noble metals or carbonate and the calcination temperature on the sensitivity of sensors were studied. The results show that the particles of α-Fe_2O_3 are in the nanometer size range, and α-Fe_2O_3 calcinated at 600?℃ and doped with 3% noble metal or SrCO_3 presents the best sensitivity to CO.

Key concepts: Calcination, Materials science, Noble metal, Nanometre, Particle-size distribution, Particle size, Precipitation, Grain size

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