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Characterization of a modular microfluidic photoionization detector

Rezende, Gustavo Coelho; Le Calvé, Stéphane; Brandner, Jürgen J.; Newport, David

Photoionization detectors with a small ionization chamber can contribute to overall gas analyser miniaturization. This work reports the characterization of a microfluidic photoionization detector prototype (μPID) which is constructed to be modular for easy replacement of the components and maintenance. The device is fabricated by micromilling and electrical discharge machining, dispensing clean room fabrication techniques. The μPID ionization chamber is a microchannel and four channel designs are presented and tested in experiments in order to evaluate the influence of the geometrical parameters on the detector performance. The chamber volumes of the channel designs range from 1.1 to 6.7 μL. Experimental characterization of the prototype is performed when it is used without and with a portable gas chromatograph (GC) for volatile organic compounds (VOCs) analysis. When a sample of 100 ppm toluene is injected directly into the μPID, it can generate a current signal up to ∼4 nA. When used without a GC, the device showed a linear response for an injection of toluene gas concentrations ranging from 1 to 100 ppm. A combination of high illumination area and electrode area resulted in the highest signal in the μPID with a detection limit of ∼40 ppb of toluene. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000122805
Veröffentlicht am 12.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 0925-4005
KITopen-ID: 1000122805
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Sensors and actuators <Lausanne> / B
Verlag Elsevier
Band 324
Seiten Article no: 128667
Vorab online veröffentlicht am 07.08.2020
Schlagwörter Photoionization detector, Miniaturization, Microfabrication, Gas chromatography, VOC detection, Air quality
Nachgewiesen in Web of Science
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