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A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications

Perez de Vargas-Sansalvador, Isabel M. and Fay, Cormac and Phelan, Thomas and Fernández-Ramosa,, M. D. and Capitán-Vallveya, Luis Fermin and Diamond, Dermot and Benito-Lopez, Fernando (2011) A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications. In: CASi-2011, 21 February 2011 09:00 - 22 February 2011 17:00 , The Helix, Dublin, Ireland.

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Abstract

CO2 monitoring is important for many areas of high economic relevance, like environmental monitoring, control of biotechnological processes in bio-pharmaceutical industries, and the food industry, particularly controlled atmosphere storage rooms and modified atmosphere packaging [ ]. CO2 sensing is not a trivial area of research, as is testified by the increasing numbers of publications regarding this topic over the past decade. The main reason is that CO2 chemically is relatively unreactive, and therefore finding a mechanism for signal generation is difficult. Most publications are based on its well-known acidic properties. In this communication, we present a portable optical sensor for gaseous CO2 detection based on the phosphorescence intensity variation of a platinum octaethylporphyrin (PtOEP) complex trapped in oxygen-insensitive poly(vinylidene chloride-co-vinyl chloride) (PVCD) membranes. The sensing mechanism arises from the increasing displacement of the α-naphtholphthalein acid–base equilibrium with rising CO2 concentrations [ ]. The low-power LED-based optical sensing instrumentation for monitoring CO2 is based on a pair of light emitting diodes (LEDs) arranged to face each other, wherein one LED functions as the light source and the other LED is reverse biased to function as a light detector [ ]. A transparent polymer substrate coated on both sides with the CO2 sensitive membrane placed between the two LEDs serves as a chemically responsive filter between the light source and the detector.

Item Type:Conference or Workshop Item (Invited Talk)
Event Type:Conference
Refereed:Yes
Uncontrolled Keywords:Gas Sensor, LED-LED, CO2
Subjects:UNSPECIFIED
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Funders:Ministerio de Ciencia e Innovación, Dirección General de Investigación y Gestión del Plan Nacional de I+D+i (Spain) (Projects CTQ2009- 14428-C02-01 and CTQ2009-14428-C02-02, European Regional Development Funds (ERDF), Junta de Andalucía (Proyecto de Excelencia P08-FQM-3535), Science Foundation Ireland under grant 07/CE/I1147 , I.M. Pérez de Vargas-Sansalvador wants to thank Junta de Andalucía for incentivo estancias breves 3/2
ID Code:16234
Deposited On:24 Mar 2011 09:33 by Fernando Benito-Lopez. Last Modified 02 Feb 2012 11:06

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