Excellent ethanol sensing properties based on Er2O3-Fe2O3 nanotubes

• 作者: 何滢 刘唱白 王圣蕾
• 来源期刊: 中国物理B（英文版）
• 关键词: Er2O3 α-Fe2O3 nanotubes ethanol gas sensing
• 年，卷（期）: 2015,（11）
• 页码范围: 118501-1-118501-6
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/11/118501

摘要

In this work, pureα-Fe2O3 and Er2O3-Fe2O3 nanotubes were synthesized by a simple single-capillary electrospin-ning technology followed by calcination treatment. The morphologies and crystal structures of the as-prepared samples were characterized by scanning electron microscopy and x-ray diffraction, respectively. The gas-sensing properties of the as-prepared samples have been researched, and the result shows that the Er2O3-Fe2O3 nanotubes exhibit much better sen-sitivity to ethanol. The response value of Er2O3-Fe2O3 nanotubes to 10 ppm ethanol is 21 at the operating temperature 240?, which is 14 times larger than that of pureα-Fe2O3 nanotubes (response value is 1.5). The ethanol sensing properties ofα-Fe2O3 nanotubes are remarkably enhanced by doping Er, and the lowest detection limit of Er2O3-Fe2O3 nanotubes is 300 ppb, to which the response value is about 2. The response and recovery times are about 4 s and 70 s to 10 ppm ethanol, respectively. In addition, the Er2O3-Fe2O3 nanotubes possess good selectivity and long-term stability.