Temporally resolved thermal desorption of volatile organics from nanoporous silica preconcentrator.
Temporally resolved thermal desorption of volatile organics from nanoporous silica preconcentrator.
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纳米多孔二氧化硅预浓缩器中挥发性有机物的时间分辨热解吸。
DOI:
10.1039/d0an01822h
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Winter W
中科院分区:
文献类型:
--
作者:
Winter W
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.
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