Preparation, Characterization and Gas Sensing Performance of Ag-supported α-Fe2O3 Hybrid

doi:10.3969/j.issn.0251-0790.2012.09.007

Abstract

Abstract:

α-Fe₂O₃ nanoparticles were synthesized by a simple hydrothermal treatment of FeCl₃ solution, followed by a calcination process, without templates or pore-directing agents. The as-prepared α-Fe₂O₃ nanoparticles were further employed as support to obtain Ag/α-Fe₂O₃ hybrid. The hybrid was characterized by XRD, TEM and XPS techniques and its gas sensing performance was investigated for several volatile organic compounds(VOCs) including methanol, ethanol, ether, acetone, butanol and hexanol at an operating temperature of 260℃. The Ag/α-Fe₂O₃ sensor presented a high sensitivity and fast response-recovery to these VOCs. Meanwhile, the Ag/α-Fe₂O₃ sensor exhibited a much higher response than the pure α-Fe₂O₃ sensor at the operating temperature of 260℃, which may be related to the unique porous structure on the surface of the Ag/α-Fe₂O₃ hybrid and the catalytic action of active Ag nanoparticles for the sensing reactions.

Key words: Ag/α-Fe₂O₃, Gas sensor, Volatile organic compound

CLC Number:

O614

TrendMD:

MA Xiao-Dong, GUO Hong-Wen, LÜ Lu, HE Xuan, FENG Xi. Preparation, Characterization and Gas Sensing Performance of Ag-supported α-Fe₂O₃ Hybrid[J]. Chem. J. Chinese Universities, 2012, 33(09): 1915.

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Preparation, Characterization and Gas Sensing Performance of Ag-supported α-Fe₂O₃ Hybrid

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