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Sensors 2008, 8(12), 7636-7648; doi:10.3390/s8127636

Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors

Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec, Canada H3A 2A7
Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6
Department of Mechanical Engineering, Ecole Polytechnique de Montreal, Case postale 6079, Succursale Centre-ville, Quebec, Canada H3C 3A7
Author to whom correspondence should be addressed.
Received: 14 November 2008 / Revised: 27 November 2008 / Accepted: 27 November 2008 / Published: 1 December 2008
(This article belongs to the Section Chemical Sensors)
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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 (O2) 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 O2 concentrations with a response time of less than 1 second. This work has implications for the development of miniaturized multisensor platforms that can be cost-effectively and reliably mass-produced. View Full-Text
Keywords: Direct-Dispense; Direct-Write; Xerogels; Oxygen Sensors; Waveguides; Optical Sensors; Fluorescence; Chemical Sensors; Polymer Waveguides Direct-Dispense; Direct-Write; Xerogels; Oxygen Sensors; Waveguides; Optical Sensors; Fluorescence; Chemical Sensors; Polymer Waveguides

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Hajj-Hassan, M.; Gonzalez, T.; Ghafar-Zadeh, E.; Djeghelian, H.; Chodavarapu, V.; Andrews, M.; Therriault, D. Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors. Sensors 2008, 8, 7636-7648.

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