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首页> 外文期刊>Advanced Functional Materials >Localized Collection of Airborne Analytes: A Transport Driven Approach to Improve the Response Time of Existing Gas Sensor Designs
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Localized Collection of Airborne Analytes: A Transport Driven Approach to Improve the Response Time of Existing Gas Sensor Designs

机译：航空分析物的本地化收集：一种运输驱动的方法，可改善现有气体传感器设计的响应时间

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摘要

The detection of single binding has been a recent trend in sensor research introducing various sensor designs where the active sensing elements are nanoscopic in size. Currently, transport and collection of airborne analytes for gas sensors is either diffusion based or non-localized and it becomes increasingly unlikely for analytes to interact with sensing structures where the active area is shrunk, trading an increased sensitivity with a slow response time. This report introduces a corona discharge based analyte charging method and an electrodynamic nanolens based analyte concentration concept to effectively transport airborne analytes to sensing points to improve the response time of existing gas sensor designs. Localized collection of analytes over a wide range, including microscopic particles, nanoparticles, and small molecules, is demonstrated. In all cases, the collection rate is several orders of magnitudes higher than in the case where the collection is driven by diffusion. The collection scheme is integrated on an existing SERS (surface-enhanced Raman spectroscopy) based sensor. In terms of response time, the process is able to detect analytes at 9 ppm (parts per million) within 1 s. As a comparison, 1 h is required to reach the same signal level when diffusion-only-transport is used.
机译：单一结合的检测已成为传感器研究的最新趋势，引入了各种传感器设计，其中有源传感元件的尺寸为纳米级。当前，用于气体传感器的空气中分析物的运输和收集是基于扩散的或非局部的，分析物与活动区域缩小的传感结构相互作用的可能性越来越小，以较慢的响应时间提高了灵敏度。该报告介绍了基于电晕放电的分析物充电方法和基于电动纳米透镜的分析物浓度概念，以有效地将空气中的分析物传输到传感点，以改善现有气体传感器设计的响应时间。展示了广泛范围内的分析物的局部收集，包括微观颗粒，纳米颗粒和小分子。在所有情况下，收集率都比通过扩散驱动收集的情况要高几个数量级。收集方案集成在现有的基于SERS（表面增强拉曼光谱）的传感器上。就响应时间而言，该过程能够在1 s内检测到9 ppm（百万分之一）的分析物。作为比较，使用仅扩散传输时，要达到相同的信号电平需要1小时。

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  • 来源
    《Advanced Functional Materials》 |2014年第24期|3706-3714|共9页
  • 作者

    Jun Fang; Se-Chul Park; Leslie Schlag; Thomas Stauden; Joerg Pezoldt; Heiko O. Jacobs;

  • 作者单位

    Electrical and Computer Engineering University of Minnesota 200 Union St. SE Minneapolis, MN 55455, USA;

    Electrical and Computer Engineering University of Minnesota 200 Union St. SE Minneapolis, MN 55455, USA;

    Fachgebiet Nanotechnologie Ilmenau University of Technology Gustav-Kirchhoff-Strasse 1 D-98693, Ilmenau, Germany;

    Fachgebiet Nanotechnologie Ilmenau University of Technology Gustav-Kirchhoff-Strasse 1 D-98693, Ilmenau, Germany;

    Fachgebiet Nanotechnologie Ilmenau University of Technology Gustav-Kirchhoff-Strasse 1 D-98693, Ilmenau, Germany;

    Fachgebiet Nanotechnologie Ilmenau University of Technology Gustav-Kirchhoff-Strasse 1 D-98693, Ilmenau, Germany;

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