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

高等学校化学研究 ›› 2012, Vol. 28 ›› Issue (4): 567-571.

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

北京师范大学化学学院

收稿日期:2011-08-01 修回日期:2011-09-13 出版日期:2012-07-25 发布日期:2012-07-25
通讯作者: Si Shufeng E-mail:ssf415007@163.com
基金资助:
纳米细菌对肾草酸钙结石成核和晶相分布的影响

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

摘要/Abstract

摘要： 采用强制水解法制备了纯α-Fe2O3和不同浓度Cr3+掺杂的α-Fe2O3材料，使用SEM、XRD、ICP和XPS等手段予以表征，并利用气敏仪测试乙醇、甲醇、丙酮、正己烷和90＃汽油在不同条件下对材料的响应性能。结果表明，Cr3+离子的掺杂不改变α-Fe2O3材料的物相，但会阻碍晶粒生长使颗粒变小。当XCr低于7%时，纯和掺杂材料颗粒均保持梭形，只是随着Cr3+离子浓度的增加，颗粒大小逐渐减小。Cr3+离子的加入显著提高了材料的气敏性能，同时，由此材料制备的元件对醇酮类气体比对烃类气体灵敏度更高，响应更快。

关键词: 强制水解法, α-Fe2O3, Cr, 气敏性质

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

Si Shufeng Ming Zhengqiu Xing Guowen Yanxi. Shape Controlled Preparation, Characterization and Gas Sensitivities of Shuttle-like Cr-doped α-Fe₂O₃ Nanoparticles[J]. 高等学校化学研究, 2012, 28(4): 567-571.

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

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

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