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Citation: JING Zhi-Hong, WU Shi-Hua. Preparation and Gas Sensing Properties of Gamma Iron Oxide Nanopowders by Microemulsion Method[J]. Chinese Journal of Applied Chemistry, ;2007, 24(2): 148-151. shu

Preparation and Gas Sensing Properties of Gamma Iron Oxide Nanopowders by Microemulsion Method

JING Zhi-Hong ^a,, ,
WU Shi-Hua ^b

1.
a College of Chemistry, Qufu Normal University, Qufu 273165;
2.
b College of Chemistry, Nankai University, Tianjin

Corresponding author: JING Zhi-Hong,
Received Date: 8 April 2006
Available Online: 8 September 2006
Fund Project: 国家自然科学基金(20271028) (20271028)

γ-Fe₂O₃ nanopowders were synthesized from the two microemulsion solutions,such as NaOH/DBS/C₆H₅CH₃/H₂O and NaOH/CTAB/CHCl₃/CH₃CH₂CH₂OH/H₂O,and their gas sensing properties were studied.The products were characterized by means of FT-IR,XRD and TEM.The results indicate that spheri-cal γ-Fe₂O₃ nanoparticles with a particle size of about 4~5 nm can be obtained from the two microemulsion solutions,when DBS and CTAB were used as surfactant and the ratios of W/O were 10.77 and 10.56, respectively.The small particle size can be attributed to the remanant surfactants adsorbed on γ-Fe₂O₃ nano-particles which prevent the aggregation of γ-Fe₂O₃ nanoparticles.The sensors,made from γ-Fe₂O₃ nanopow-ders obtained from the two microemulsion solutions,have high sensitivities of 12.5 for DBS and 23.8 for CTAB to 0.1% ethanol,as well as show short response-recovery time to 0.1% ethanol,that is,20 and 30 s for DBS and 15 and 47 s for CTAB,respectively.Both of them can meet the requirements of practical applications and are promising ethanol sensors due to their sensitivities and good linear relations to the concentration.
- gamma-Fe₂O₃ nanopowders,
- microemulsion method,
- gas sensing properties,
- surfactant
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