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NO_2 SENSING PROPERTIES IN THE Fe_2O_3-WO_3 SYSTEM

机译:Fe_2O_3-WO_3系统中的NO_2传感特性

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摘要

The gas sensitivity properties of transition-metal oxides, i.e. α-Fe_2O_3, WO_3 and Fe_2WO_6, have been studied for the detection of NO_2 gas below 100 ppm concentration, and in the working temperature range 150°-400℃. Bulk sensors have been obtained by sintering at 800℃ for 1h. Thin film sensors have been obtained by evaporating the precursor powders, on sapphire substrates provided with Pt finger type sputtered electrodes, and annealing at 500℃ for 1 h. The film morphology, crystalline phase and chemical composition of the sensors have been characterised through AFM, low angle XRD and XPS. The electrical response has been measured by means of dc and ac current mode. Fe_2O_3 and Fe_2WO_6 pellets show the highest sensitivity to NO_2 gas at 200℃, while WO_3 has been at 150℃. The gas sensitivity of the films is smaller as compared to the bulk materials, but with improved response time and reproducibility. WO_3 has shown the highest gas sensitivity throughout all the investigated materials. The cross-sensitivity effect has been investigated for CO, CH_4 and humidity.
机译:研究了过渡金属氧化物,即α-Fe_2O_3,WO_3和Fe_2WO_6的气体敏感性特性,用于在工作温度范围为150°-400℃时检测浓度低于100 ppm的NO_2气体。通过在800℃下烧结1h获得了块状传感器。薄膜传感器是通过在配备有Pt手指型溅射电极的蓝宝石衬底上蒸发前体粉末并在500℃下退火1小时而获得的。通过AFM,低角度XRD和XPS对传感器的薄膜形态,晶相和化学成分进行了表征。通过直流和交流电流模式测量了电响应。 Fe_2O_3和Fe_2WO_6球团在200℃时对NO_2气体的敏感性最高,而WO_3在150℃时。与块状材料相比,薄膜的气体敏感性较小,但响应时间和重现性得到改善。 WO_3在所有研究的材料中显示出最高的气体敏感性。研究了对CO,CH_4和湿度的交叉敏感效应。

著录项

  • 来源
    《Chemical sensors》|1995年|77-80|共4页
  • 会议地点 Xian(CN);Xian(CN)
  • 作者单位

    Department of Chemistry and Materials, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Chemistry and Materials, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Chemistry and Materials, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Chemistry and Materials, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Chemistry and Materials, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Physics, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Physics, University of L'Aquila, 67040 L'Aquila, Italy;

    Department of Physics, University of L'Aquila, 67040 L'Aquila, Italy;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 电子元件、组件;电感器、线圈、扼流圈;
  • 关键词

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