Carbon dioxide sensor using N,N-dimethylaminoethyl methacrylate and methyl methacrylate copolymer

N,N-dimethylaminoethyl methacrylate (DMAEM)-methyl methacrylate (MMA) copolymers with several different compositions were prepared by gamma-ray irradiation. The sorption of carbon dioxide on the copolymer was measured by the frequency change of the 4 MHz quartz oscillators coated with the copolymers. Carbon dioxide sorption on the DMAEM-MMA copolymer was characterized by the dual sorption model (Henry type and Langmuir type). The fraction of Henry-type sorption is the smallest for the copolymer with 0.1 DMAEM mole fraction. A fast-response sensor could be fabricated when a copolymer with 0.1 DMAEM mole fraction was used.