Temporally resolved thermal desorption of volatile organics from nanoporous silica preconcentrator,Analyst

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Temporally resolved thermal desorption of volatile organics from nanoporous silica preconcentrator
Analyst ( IF 3.6 ) Pub Date : 2020-11-03 , DOI: 10.1039/d0an01822h
William Winter _{1,

2,

3} , Coco Day _{3,

4,

5,

6} , Joshua Prestage _{1,

2,

3} , Tanya Hutter _{1,

2,

3,

7,

8}

Affiliation

Detection and separation of gas-phase volatile organic compounds (VOCs) is of great importance for many applications including air quality monitoring, toxic gas detection and medical diagnostics. A lack of small and low-cost detectors limits the potential applications of VOC gas sensors, especially in the areas of consumer products and the ‘Internet of Things’. Most of the commercially available low-cost technologies are either only capable of measuring a single VOC type, or only provide a total VOC concentration, without the ability to provide information on the nature or type of the VOC. We present a new approach for improving the selectivity of VOC detection, based on temporally resolved thermal desorption of VOCs from a nanoporous material, which can be combined with any existing VOC detector. This work uses a nanoporous silica material that adsorbs VOC molecules, which are then thermally desorbed onto a broadband VOC detector. Different VOCs are desorbed at different temperatures depending on their boiling point and affinity to the porous surface. The nanoporous silica is inert; VOC adsorption is proportional to the concentration of VOC in the environment, and is fully reversible. An example of a detection system using a commercial total VOC photoionization detector and a nanoporous silica preconcentrator is demonstrated here for six different VOCs, and shows potential for discrimination between the VOCs.

中文翻译：

从纳米多孔二氧化硅预浓缩器中临时解析挥发性有机物的热脱附

气相挥发性有机化合物（VOC）的检测和分离对于许多应用（包括空气质量监测，有毒气体检测和医学诊断）非常重要。缺少小型和低成本的探测器限制了VOC气体传感器的潜在应用，特别是在消费产品和“物联网”领域。大多数可商购的低成本技术要么只能测量一种VOC类型，要么只能提供总VOC浓度，而不能提供有关VOC的性质或类型的信息。我们基于时间分辨的纳米多孔材料中挥发性有机化合物的热解吸，提出了一种改进挥发性有机化合物检测选择性的新方法，该方法可与任何现有的挥发性有机化合物检测器结合使用。这项工作使用了一种纳米多孔二氧化硅材料，该材料吸附了VOC分子，然后将其热解吸到宽带VOC检测器上。根据其沸点和对多孔表面的亲和力，不同的VOC会在不同的温度下解吸。纳米多孔二氧化硅是惰性的。VOC吸附与环境中VOC的浓度成正比，并且是完全可逆的。在此，针对六个不同的VOC展示了使用商用总VOC光电离检测器和纳米多孔二氧化硅预浓缩器的检测系统示例，并显示了区分VOC的潜力。纳米多孔二氧化硅是惰性的。VOC吸附与环境中VOC的浓度成正比，并且是完全可逆的。在此，针对六个不同的VOC展示了使用商用总VOC光电离检测器和纳米多孔二氧化硅预浓缩器的检测系统示例，并显示了区分VOC的潜力。纳米多孔二氧化硅是惰性的。VOC吸附与环境中VOC的浓度成正比，并且是完全可逆的。在此，针对六个不同的VOC展示了使用商用总VOC光电离检测器和纳米多孔二氧化硅预浓缩器的检测系统示例，并显示了区分VOC的潜力。

更新日期：2020-11-09

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