Fabrication and CO gas-sensing properties of Pt-functionalized Ga₂O₃ nanowires

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• 作者：Hyunsu Kim ; Changhyun Jin ; Soyeon An ; Chongmu Lee ; ^{cmlee@inha.ac.kr}
• 关键词：Gas sensor ; Pt-functionalized ; Ga2O3 nanowires ; CO gas
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3563-3567
• 文件大小：754 K

摘要

Ga₂O₃ one-dimensional (1D) nanostructures were synthesized using an evaporation technique. The morphology, crystal structure and enhanced sensing properties of the Ga₂O₃ nanostructures functionalized with Pt to CO gas at 100 掳C were examined. The diameter and lengths of the 1D nanostructures ranged from a few tens to a few hundreds of nanometers and up to a few hundreds of micrometers, respectively. Pt nanoparticles with diameters of a few tens of nanometers were distributed over the Ga₂O₃ nanowires. Multiple networked gas sensors fabricated from these Pt-functionalized Ga₂O₃ nanowires exhibited enhanced electrical responses to CO gas. The responses of the nanowires were improved 27.8, 26.1, 22.0 and 16.9 fold at CO concentrations of 10, 25, 50, and 100 ppm, respectively, Compared to the bare Ga₂O₃ nanowires. The mechanism responsible for the enhanced gas sensing properties of the Pt-functionalized Ga₂O₃ nanowires is discussed.