The cover photo describes the graphical representation of a programmable microfluidic device for the capture and detection of a variety of cells and bacteria. Recently, the interest in microfluidic technology has progressed considerably since the last decade due to its advanced applications in many areas including protein biochemistry, cell culture, detection, and electromechanical systems.
Substrate integrated circular cavity resonator filled with nano-fibrillated cellulose for humidity detection
Majid Ndoye1*, Benoit Bideau1, Aina Heritiana Rasolomboahanginjatovo1, Éric Loranger1, Dominic Deslandes2, Frédéric Domingue1
1Université du Québec à Trois-Rivières (UQTR), Trois-Rivières (QC), Canada
2École de technologie supérieure (ETS), Montréal (QC), Canada
Adv. Mater. Lett., 2019, 10 (6), pp 400-404
DOI: 10.5185/amlett.2019.1927
Publication Date (Web): Jan 14, 2019
Copyright © 2018 VBRI Press
E-mail: majid.ndoye@uqtr.ca
In this work, a novel microwave sensor fully based on Substrate Integrated Waveguide (SIW) technology filled with nano-fibrillated cellulose for humidity detection is presented for the very first time. The proposed structure consists of a circular SIW cavity resonator perturbed by the inclusion of nano-fibrillated cellulose inside the cavity. Due to the presence of humidity, the relative permittivity of the eco-friendly dielectric, which is known as a humidity sensitive material, changes, leading to a shift of the resonance frequency of the Substrate Integrate Cavity Circular Resonator (SICCR). The proposed humidity sensor structure operates between 4.28 to 4.32 GHz and exhibits a frequency shift of around 20 MHz for relative humidity in the range of 11.7% to 91% RH. The proposed sensing device operates with very low-cost sustainable and renewable material, is simple to manufacture, co-integrates with existing microwave planar circuits and has the advantage of demonstrating high sensitivity performance.
Nano-fibrillated cellulose, humidity sensor, microwave cavity resonator, substrate integrated waveguides (SIW).
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