Shape Controlled Preparation, Characterization and Gas Sensitivities of Shuttle-like Cr-doped α-Fe2O3 Nanoparticles

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (4): 567-571.

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Shape Controlled Preparation, Characterization and Gas Sensitivities of Shuttle-like Cr-doped α-Fe₂O₃ Nanoparticles

SI Shu-feng, MING Zheng-qiu, XING Guo-wen, YAN Xi

Received:2011-08-01 Revised:2011-09-13 Online:2012-07-25 Published:2012-07-25
Contact: Shufeng Si E-mail:ssf415007@163.com

Abstract

Abstract: α-Fe2O3 nanoparticles doped with various mol% Cr3+ have been synthesized by a forced hydrolysis route, and were characterized by XRD, SEM, XPS and ICP techniques. The particles reserve shuttle-like shape in the presence of Cr3+ ions. The crystallite sizes of Fe2O3 become smaller with the increased Cr3+ concentration in solution. The responses of Cr doped α-Fe2O3 sensors were studied towards reducing gases such as ethanol, methanol, acetone, gasoline and n-hexane. Gas sensors based on these materials have higher sensitivities and rapid response/recovery time to alcohol than to hydrocarbon.

Key words: forced hydrolysis, α-Fe2O3, Cr, gas sensitivity

Shufeng Si Zhengqiu Ming Guowen Xing Xi Yan. Shape Controlled Preparation, Characterization and Gas Sensitivities of Shuttle-like Cr-doped α-Fe₂O₃ Nanoparticles[J]. Chemical Research in Chinese Universities, 2012, 28(4): 567-571.

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Shape Controlled Preparation, Characterization and Gas Sensitivities of Shuttle-like Cr-doped α-Fe₂O₃ Nanoparticles

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