A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications
Vargas-Sansalvador, Isabel María Pérez deORCID: 0000-0002-3666-3231, Fay, CormacORCID: 0000-0001-9104-5527, Phelan, Thomas, Fernández-Ramos, M.D., Capitán-Vallvey, Luis Fermin, Diamond, DermotORCID: 0000-0003-2944-4839 and Benito-Lopez, FernandoORCID: 0000-0003-0699-5507
(2011)
A new LED-LED portable CO2 gas sensor based on an interchangeable membrane system for industrial applications.
Analytica Chimica Acta, 699
(2).
pp. 216-222.
ISSN 0003-2670
A new system for CO2 measurement (0-100%) by based on a paired emitter-detector diode arrangement as a colorimetric detection system is described. Two different configurations were tested: configuration 1 (an opposite side configuration) where a secondary inner-filter effect accounts for CO2 sensitivity. This configuration involves the absorption of the phosphorescence emitted from a CO2-insensitive luminophore by an acid-base indicator and configuration 2 wherein the membrane containing the luminophore is removed, simplifying the sensing membrane that now only contains the acid-base indicator. In addition, two different instrumental configurations have been studied, using a paired emitter-detector diode system, consisting of two LEDs wherein one is used as the light source (emitter) and the other is used in reverse bias mode as the light detector. The first configuration uses a green LED as emitter and a red LED as detector, whereas in the second case two identical red LEDs are used as emitter and detector. The system was characterised in terms of sensitivity, dynamic response, reproducibility, stability and temperature influence. We found that configuration 2 presented a better CO2 response in terms of sensitivity.
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Funders:
Ministerio de Ciencia e Innovacion (CTQ2009-11428-C02-01), Direccion General de Investigacion y Gestion del Plan Nacional de I+D+i (CTQ2009-14429-C02-02), Jaunta de Andalucia (Proyecto de Excelencia P08-FQM-3535), Science Foundation Ireland
ID Code:
16494
Deposited On:
25 Aug 2011 13:01 by
Cormac Fay
. Last Modified 28 May 2019 15:40