The carbon dioxide sensor includes a CO.sub.2 sensing matrix formed from a hydrophilic, gas permeable, cross-linked polyurethane. The polyurethane matrix is formed from a polyurethane pre-polymer mixture which cross links when mixed with an aqueous carbon dioxide buffer solution. The dye-buffer solution...http://www.google.ca/patents/US5326531?utm_source=gb-gplus-sharePatent US5326531 - CO.sub.2 sensor using a hydrophilic polyurethane matrix and process for manufacturing
