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

Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors

1
Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec, Canada H3A 2A7
2
Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6
3
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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Abstract

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

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MDPI and ACS Style

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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