Alpha-Fe₂O₃@ZnO heterostructured nanotubes for gas sensing

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• 作者：Fenglong Wang ; Jiurong Liu ; ^{jrliu@sdu.edu.cn} ; Xinzhen Wang ; Jing Kong ; Song Qiu ; Guixia Lu ; Cuizhu He
• 关键词：Alpha-Fe2O3@ZnO nanotubes ; Nanoparticles ; Semiconductors ; Nanocomposites
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 June, 2012
• 卷：76
• 期：Complete
• 页码：159-161
• 文件大小：450 K

摘要

Alpha-Fe₂O₃ nanotubes and alpha-Fe₂O₃@ZnO heterostructured nanotubes have been synthesized through a hydrothermal method and a sol-gel route, respectively. Electronic microscopy examinations demonstrate that the alpha-Fe₂O₃ nanotubes with lengths ranging from 200 to 300 nm and width around 150 nm have a hollow feature and the thickness of the wall is about 30 nm. After a sol-gel process, a layer of ZnO with a thickness of 20 nm formed on the surface. X-ray diffraction patterns show that the obtained products are well crystallized and have high purity. The synthesized alpha-Fe₂O₃ nanotubes and alpha-Fe₂O₃@ZnO heterostructured nanotubes have specific surface area of 26.5 m²g^鈭?#xA0;1 and 35 m²g^鈭?#xA0;1, respectively. The gas sensing test reveals that the heterostructured nanotubes can get a high sensitivity (32) to acetone at the temperature of 642 K.