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Optical sensors for carbon dioxide: an overview of sensing strategies past and present

Mills, A. and Eaton, K. (2000) Optical sensors for carbon dioxide: an overview of sensing strategies past and present. Quimica Analitica, 19 (Supple). pp. 75-86. ISSN 0212-0569

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The evolution of the optical sensor for CO2 over the past two decades is outlined and illustrated through examples of luminescent-based sensors. The basic principles and design of the early 'wet covered' type sensor, in which a pH sensitive dye in an aqueous buffer is covered by a gas permeable, ion impermeable, membrane, are outlined. The gradual move from the 'wet covered' types of CO2 optical sensor to 'solid-water droplet' type sensors and then onto 'solid' sensors is charted. The basic design and principles of operation of the modern 'solid' optical sensor for P-CO2 is covered in some detail. Other sensing strategies outside the simple use of pH-sensitive dyes are also considered, most notably those based on luminescence lifetime measurements.