Highly sensitive and selective room temperature alcohol gas sensors based on TeO2 nanowires

作者：Shen, Yanbai^*; Zhao, Sikai; Ma, Jiawei; Chen, Xiangxiang; Wang, Wei; Wei, Dezhou^*; Gao, Shuling; Liu, Wengang; Han, Cong; Cui, Baoyu

来源：Journal of Alloys and Compounds, 2016, 664: 229-234.

DOI：10.1016/j.jallcom.2015.12.247

• Tellurium oxide
• Nanowires
• Alcohol
• Gas sensor

TeO2 nanowires were synthesized by thermal evaporation of Te powders in air at ambient pressure. The crystal structure, morphology, and alcohol sensing properties of TeO2 nanowires were investigated. Structural characterizations showed that TeO2 nanowires with a tetragonal structure were approximately 70-200 nm in diameter and several hundreds of micrometers to 2 mm in length. No Au nanoparticles were observed at any ends of TeO2 nanowires, revealing that the growth process was dominated by the vapour-solid growth mechanism. Gas sensing measurements indicated that TeO2 nanowires with an n-type conduction showed a quick and reversible response to ethanol gas at room temperature. The response increased in the order of methanol > ethanol > propanol under the same conditions as well as with increasing alcohol gas concentration. The results demonstrate the feasibility of using TeO2 nanowires for sensing alcohol gases.

• 出版日期2016-4-15
• 单位东北大学