Micro Milled Microfluidic Photoionization Detector for Volatile Organic Compounds
Gustavo C. Rezende
Jürgen J. Brandner
1
Bernal Institute, School of Engineering, University of Limerick, V94 T9PX Limerick, Ireland
2
Université de Strasbourg, Centre national de la recherche scientifique (CNRS), ICPEES UMR 7515, F-67087 Strasbourg, France
3
In’Air Solutions, 25 rue Becquerel, 67087 Strasbourg, France
4
Institute of Microstructure Technology (IMT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(4), 228; https://doi.org/10.3390/mi10040228
Received: 8 February 2019 / Revised: 22 March 2019 / Accepted: 28 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Gas Flows in Microsystems)
Government regulations and environmental conditions are pushing the development of improved miniaturized gas analyzers for volatile organic compounds. One of the many detectors used for gas analysis is the photoionization detector (PID). This paper presents the design and characterization of a microfluidic photoionization detector (or µPID) fabricated using micro milling and electrical discharge machining techniques. This device has no glue and facilitates easy replacement of components. Two materials and fabrication techniques are proposed to produce a layer on the electrodes to protect from ultraviolet (UV) light and possible signal noise generation. Three different microchannels are tested experimentally and their results are compared. The channel with highest electrode area (31.17 mm²) and higher volume (6.47 µL) produces the highest raw signal and the corresponding estimated detection limit is 0.6 ppm for toluene without any amplification unit.
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Keywords:
photoionization detector; microfluidics; microfabrication; volatile organic compound (VOC) detection; toluene
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MDPI and ACS Style
Rezende, G.C.; Le Calvé, S.; Brandner, J.J.; Newport, D. Micro Milled Microfluidic Photoionization Detector for Volatile Organic Compounds. Micromachines 2019, 10, 228.
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