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Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors

Mohamad Hajj-Hassan, Timothy Gonzalez, Ebrahim Ghafar-Zadeh, Hagop Djeghelian, Vamsy Chodavarapu, Mark Andrews and Daniel Therriault

Article (2008)

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Cite this document: Hajj-Hassan, M., Gonzalez, T., Ghafar-Zadeh, E., Djeghelian, H., Chodavarapu, V., Andrews, M. & Therriault, D. (2008). Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors. Sensors, 8(12). doi:10.3390/s8127636
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We describe an automated robotic technique called direct-dispense to fabricate a polymeric platform that supports optical sensor arrays. Direct-dispense, which is a type of the emerging direct-write microfabrication techniques, uses fugitive organic inks in combination with cross-linkable polymers to create microfluidic channels and other microstructures. Specifically, we describe an application of direct-dispensing to develop optical biochemical sensors by fabricating planar ridge waveguides that support sol-gelderived xerogel-based thin films. The xerogel-based sensor materials act as host media to house luminophore biochemical recognition elements. As a prototype implementation, we demonstrate gaseous oxygen (O(2)) responsive optical sensors that operate on the basis of monitoring luminescence intensity signals. The optical sensor employs a Light Emitting Diode (LED) excitation source and a standard silicon photodiode as the detector. The sensor operates over the full scale (0%-100%) of O(2) concentrations with a response time of less than 1 second. This work has implications for the development of miniaturized multi-sensor platforms that can be cost-effectively and reliably mass-produced.

Uncontrolled Keywords

Chemical Sensors; Direct-Dispense; Direct-Write; Fluorescence; Optical Sensors; Oxygen Sensors; Polymer Waveguides; Waveguides; Xerogels

Open Access document in PolyPublie
Subjects: 1700 Conception et fabrication > 1702 Méthodes de fabrication avancées
2000 Science et technologie des matériaux > 2004 Polymères et revêtements
2100 Génie mécanique > 2100 Génie mécanique
Department: Département de génie mécanique
Research Center: Non applicable
Funders: CRSNG/NSERC, Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)
Date Deposited: 07 Dec 2018 13:08
Last Modified: 08 Dec 2018 01:20
PolyPublie URL: https://publications.polymtl.ca/3389/
Document issued by the official publisher
Journal Title: Sensors (vol. 8, no. 12)
Publisher: MDPI
Official URL: https://doi.org/10.3390/s8127636


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