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Open AccessArticle

A Multiparameter Gas-Monitoring System Combining Functionalized and Non-Functionalized Microcantilevers

1
TrueDyne Sensors AG, 4153 Reinach BL, Switzerland
2
Nanoscience Institute of Aragon (INA), University of Zaragoza, 50009 Zaragoza, Spain
3
Instituto de Ciencia de Materiales de Aragon (ICMA), Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(3), 283; https://doi.org/10.3390/mi11030283 (registering DOI)
Received: 15 January 2020 / Revised: 4 March 2020 / Accepted: 8 March 2020 / Published: 10 March 2020
(This article belongs to the Special Issue MFHS 2019)
The aim of the study is to develop a compact, robust and maintenance free gas concentration and humidity monitoring system for industrial use in the field of inert process gases. Our multiparameter gas-monitoring system prototype allows the simultaneous measurement of the fluid physical properties (density, viscosity) and water vapor content (at ppm level) under varying process conditions. This approach is enabled by the combination of functionalized and non-functionalized resonating microcantilevers in a single sensing platform. Density and viscosity measuring performance is evaluated over a wide range of gases, temperatures and pressures with non-functionalized microcantilevers. For the humidity measurement, microporous Y-type zeolite and mesoporous silica MCM48 are evaluated as sensing materials. An easily scalable functionalization method to high-throughput production is herein adopted. Experimental results with functionalized microcantilevers exposed to water vapor (at ppm level) indicate that frequency changes cannot be attributed to a mass effect alone, but also stiffness effects dependent on adsorption of water and working temperature must be considered. To support this hypothesis, the mechanical response of such microcantilevers has been modelled considering both effects and the simulated results validated by comparison against experimental data. View Full-Text
Keywords: microcantilever; nanoporous functional coatings; welding gas monitoring; ppm of water content microcantilever; nanoporous functional coatings; welding gas monitoring; ppm of water content
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MDPI and ACS Style

Huber, C.; Pina, M.P.; Morales, J.J.; Mehdaoui, A. A Multiparameter Gas-Monitoring System Combining Functionalized and Non-Functionalized Microcantilevers. Micromachines 2020, 11, 283.

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