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首页> 外文期刊>Sensors and Actuators >Creating oxygen vacancies on porous indium oxide nanospheres via metallic aluminum reduction for enhanced nitrogen dioxide detection at low temperature
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Creating oxygen vacancies on porous indium oxide nanospheres via metallic aluminum reduction for enhanced nitrogen dioxide detection at low temperature

机译：通过金属铝通过金属铝在低温下降低金属铝铝铝铝铝的氧空位。在低温下提高二氧化氮检测

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摘要

Investigating the correlation between the electronic structure of indium oxide materials with oxygen vacancy defects and their sensing property to nitrogen dioxide is important for future development of high-efficient sensing materials. For the first time, the defective structure of porous In2O3 nanospheres was introduced in a two-zone tube furnace using metallic Al as reducing agent. Texture characterizations show that In2O3 and In2O3-x. are porous nanospheres assembled by small particles with the size of ca. 10-20 nm. The surface oxygen vacancy defects and electronic structure of samples were characterized by X-ray power diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance, photoluminescence, ultraviolet-visible spectrophotometer and Hall analysis, and the sensing performance of samples to NO2 gas was evaluated. The results display that the porous In2O3-x nanospheres prepared at the reducing temperature of 300 C (Vo-In2O3-300) exhibits improved response of 130 to 3 ppm NO2 at 80 degrees C, which is almost 2.5-folds as high as the response (55) of the porous In2O3 nanospheres. The sensing mechanism study carried out using DFT indicates that oxygen vacancies on the surface of In2O3 as donor level optimize the electron structure and electrical properties of materials, such as supplying more free-electrons in the conduction band, narrowing the band gap and improving the mobility of electrons, which result in the low energy barrier for the adsorption of NO2 molecules on the surface and in turn enhance the gas-sensing performance of In2O3. Therefore, this work can provide some instructive thoughts for constructing InIn2O3-based sensing materials for high-efficient nitrogen dioxide detection.
机译：研究具有氧气空位缺陷的氧化铟材料的电子结构与其对二氧化氮的传感性能的相关性对于未来的高效传感材料的发展是重要的。首次使用金属As作为还原剂在双区管炉中引入多孔In2O3纳米膜的缺陷结构。纹理表征显示In2O3和In2O3-x。是由小颗粒组装的多孔纳米球，其尺寸为约。 10-20 nm。通过X射线功率衍射，X射线光电子体光谱，电子顺磁共振，光致发光，紫外线可见分光光度计和霍尔分析，表征样品的表面氧空位缺陷和电子结构。评价样品对No2气体的感测性能。结果显示，在300℃的还原温度下制备的多孔In2O3-X纳米球在80℃下表现出130至3ppm No2的改善响应，这与响应高2.5倍（55）多孔In2O3纳米球。使用DFT进行的传感机制研究表明，作为供体水平的IN2O3表面上的氧空位优化了材料的电子结构和电性能，例如在导通带中供应更多的游离电子，缩小带隙并改善移动性。电子，这导致低能量屏障，用于吸附表面上的NO2分子，然后提高IN2O3的气体传感性能。因此，这项工作可以提供一些用于构建基于IN2O3的传感材料的有效思想，以实现高效氮的二氧化氮检测。

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  • 来源
    《Sensors and Actuators》 |2020年第1期|127221.1-127221.11|共11页
  • 作者

    Du Wenjing; Si Wenxu; Wang Fenglong; Lv Longfei; Wu Lili; Wang Zhou; Liu Jiurong; Liu Wei;

  • 作者单位

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ Minist Educ Key Lab Liquid Solid Struct Evolut & Proc Mat Jinan 250061 Shandong Peoples R China|Shandong Univ Sch Mat Sci & Engn Jinan 250061 Shandong Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Indium oxide; Oxygen vacancy; Nitrogen dioxide; Electrical property; Gas sensing;

    机译：氧化铟;氧气空位;二氧化氮;电景;气体感应;

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