<  Back to the Polytechnique Montréal portal

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)

Open Acess document in PolyPublie and at official publisher
Open Access to the full text of this document
Published Version
Terms of Use: Creative Commons Attribution
Download (544kB)
Show abstract
Hide 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 (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

Subjects: 1700 Design and manufacturing > 1702 Advanced manufacturing
2000 Materials science and technology > 2004 Polymers and coatings
2100 Mechanical engineering > 2100 Mechanical engineering
Department: Department of Mechanical Engineering
Funders: CRSNG/NSERC, Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)
PolyPublie URL: https://publications.polymtl.ca/3389/
Journal Title: Sensors (vol. 8, no. 12)
Publisher: MDPI
DOI: 10.3390/s8127636
Official URL: https://doi.org/10.3390/s8127636
Date Deposited: 07 Dec 2018 13:08
Last Modified: 07 Nov 2023 11:04
Cite in APA 7: 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), 7636-7648. https://doi.org/10.3390/s8127636


Total downloads

Downloads per month in the last year

Origin of downloads


Repository Staff Only

View Item View Item