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We report a field effect transistor (FET) based on a network of single-walled carbon nanotubes (SWCNTs) that for the first time can selectively detect a single gaseous molecule in air by chemically functionalizing the SWCNTs with a selective molecular receptor. As a target model we used SO 2 . The molecular synthetic receptor is a square-planar NCN-pincer platinum (II) complex (NCN is the...