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Comparison between linear and branched polyethylenimine and reduced graphene oxide coatings as a capture layer for micro resonant CO2 gas concentration sensors

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Prudhomme, Alberto et Nabki, Frédéric. 2020. « Comparison between linear and branched polyethylenimine and reduced graphene oxide coatings as a capture layer for micro resonant CO2 gas concentration sensors ». [Peer review article]. Sensors (Switzerland), vol. 20, nº 7.

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Abstract

first_pagesettings Open AccessArticle Comparison between Linear and Branched Polyethylenimine and Reduced Graphene Oxide Coatings as a Capture Layer for Micro Resonant CO2 Gas Concentration Sensors by Alberto Prud’homme * andFrederic NabkiOrcID Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC H3C 1K3, Canada * Author to whom correspondence should be addressed. Sensors 2020, 20(7), 1824; https://doi.org/10.3390/s20071824 Received: 14 February 2020 / Revised: 17 March 2020 / Accepted: 20 March 2020 / Published: 25 March 2020 (This article belongs to the Special Issue Nanomechanical Sensors) Download PDF Browse Figures Abstract The comparison between potential coatings for the measurement of CO2 concentration through the frequency shift in micro-resonators is presented. The polymers evaluated are linear polyethylenimine, branched polyethylenimine and reduced graphene oxide (rGO) by microwave reduction with polyethylenimine. The characterization of the coatings was made by using 6 MHz gold-plated quartz crystals, and a proof-of-concept sensor is shown with a diaphragm electrostatic microelectromechanical systems (MEMS) resonator. The methods of producing the solutions of the polymers deposited onto the quartz crystals are presented. A CO2 concentration range from 0.05% to 1% was dissolved in air and humidity level were controlled and evaluated. Linear polyethylenimine showed superior performance with a reaction time obtained for stabilization after the concentration increase of 345 s, while the time for recovery was of 126 s, with a maximum frequency deviation of 33.6 Hz for an in-air CO2 concentration of 0.1%.

Item Type: Peer reviewed article published in a journal
Professor:
Professor
Nabki, Frédéric
Affiliation: Génie électrique
Date Deposited: 22 Apr 2020 14:11
Last Modified: 27 Nov 2020 15:55
URI: https://espace2.etsmtl.ca/id/eprint/20521

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