High response and stability in CO and humidity measures using a single SnO₂ nanowire

详细信息	查看全文 | 推荐本文 |

• 作者：F. Herná ; ndez-Ramí ; rez ; A. Tarancó ; n ; O. Casals ; J. Arbiol ; A. Romano-Rodrí ; guez ; J.R. Morante
• 关键词：Metal oxide nanowire ; SnO₂ nanowire ; Focused ion beam FIB ; Gas sensor ; Nanosensor ; Nanocontacts ; Four-probes measures ; AC impedance spectroscopy ; CO gas sensor ; Humidity influence
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2007
• 期刊代码：161_09254005
• 类别：et
• 出版时间：30 January 2007
• 卷：121
• 期：1
• 页码：3-17
• 文件大小：2496 K

摘要

Single SnO₂ metal oxide nanowires are used at the nanoscale level as individual monocrystal for the electrical transduction of the gas interaction with these sensing materials. Electrical contact characteristics and resistance variations under different gas ambient are analyzed from two- and four-probes measurements of individual nanowires. These data have allowed the estimation of their resistivities and contact resistances. At the gas sensor working conditions, AC impedance spectroscopy technique has extensively been applied to analyze the interaction with the gas molecules and study the influence of the nanowire diameter size on the electrical transduction processes. CO and humidity behaviors are reported for single SnO₂ nanowires with CO detection threshold smaller than 5 ppm and measurement instability lower than 4%.