Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors
AbstractWe 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
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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.
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(12):7636-7648.Chicago/Turabian Style
Hajj-Hassan, Mohamad; Gonzalez, Timothy; Ghafar-Zadeh, Ebrahim; Djeghelian, Hagop; Chodavarapu, Vamsy; Andrews, Mark; Therriault, Daniel. 2008. "Direct-Dispense Polymeric Waveguides Platform for Optical Chemical Sensors." Sensors 8, no. 12: 7636-7648.