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A hydrophobic polymer material is presented which is optically sensitive to carbon dioxide. It is based on ion pairing between an indicator anion and a quaternary ammonium cation. The ion pair is dissolved in various kinds of silicone rubbers, and the resulting materials are shown to be useful for optically sensing carbon dioxide over the 0-100 hPa (0-76 Torr, 0-100 mbar) partial pressure range...
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