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Mid-IR evanescent-field fiber sensor with enhanced sensitivity for volatile organic compounds

机译：中红外渐逝场光纤传感器，具有增强的挥发性有机化合物的灵敏度

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摘要

The increasing awareness of the harsh environmental and health risks associated with air pollution has placed volatile organic compounds (VOCs) sensor technologies in elevated demand. While the currently available VOC-monitoring technologies are either bulky and expensive, or only capable of measuring a total VOC concentration, the selective detection of VOCs in the gas-phase remains a challenge. To overcome this, a novel method and device based on mid-IR evanescent-wave fiber-optic spectroscopy, which enables enhanced detection of VOCs, is hereby proposed. This is achieved by increasing the number of analyte molecules in the proximity of the evanescent field via capillary condensation inside nano-porous microparticles coated on the fiber surface. The nano-porous structure of the coating allows the VOC analytes to rapidly diffuse into the pores and become concentrated at the surface of the fiber, thereby allowing the utilization of highly sensitive evanescent-wave spectroscopy. To ascertain the effectiveness and performance of the sensor, different VOCs are measured, and the enhanced sensitivity is analyzed using a custom-built gas cell. According to the results presented here, our VOC sensor shows a significantly increased sensitivity compared to that of an uncoated fiber.
机译：与空气污染相关的恶劣环境和健康风险的提高意识使得升高的有机化合物（VOCS）传感器技术升高。虽然目前可用的VOC监测技术要么庞大且昂贵，或者只能测量总VOC浓度，但在气相中的选择性检测仍然是一个挑战。为了克服这一点，特此提出了一种基于MID-IR渐逝波光纤光谱的方法和装置，其能够增强VOC的检测。这是通过通过涂覆在纤维表面上的纳米多孔微粒内通过毛细血管缩小的荧光缩合的分析物分子的数量来实现。涂层的纳米多孔结构允许VOC分析物快速扩散到孔中并浓缩在纤维表面，从而允许利用高敏感的渐逝波光谱。为了确定传感器的有效性和性能，测量不同的VOC，使用定制的气池分析增强的灵敏度。根据此处呈现的结果，与未涂覆的光纤相比，我们的VOC传感器显示出显着增加的灵敏度。

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  • 来源
    《RSC Advances》 |2019年第37期|共6页
  • 作者

    Alimagham Farah; Platkov Max; Prestage Joshua; Basov Svetlana; Izakson Gregory; Katzir Abraham; Elliott Stephen R.; Hutter Tanya;

  • 作者单位

    Univ Cambridge Dept Chem Cambridge CB2 1EW England;

    Nucl Res Ctr Negev IL-84190 Beer Sheva Israel;

    SensorHut Ltd Cambridge CB2 9DN England;

    Tel Aviv Univ Aby &

    Aladar Fleischman Fac Engn Dept Biomed Engn IL-69987 Tel Aviv Israel;

    Tel Aviv Univ Sch Phys &

    Astron Raymond &

    Beverly Sackler Fac Exact Sci IL-69987 Tel Aviv Israel;

    Tel Aviv Univ Sch Phys &

    Astron Raymond &

    Beverly Sackler Fac Exact Sci IL-69987 Tel Aviv Israel;

    Univ Cambridge Dept Chem Cambridge CB2 1EW England;

    Univ Cambridge Dept Chem Cambridge CB2 1EW England;

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  • 正文语种 eng
  • 中图分类 化学;
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