title: A miniature chemiresistor sensor for carbon dioxide.
abstract: A carpet-like nanostructure of polyaniline (PANI) nanothin film functionalized with poly(ethyleneimine), PEI, was used as a miniature chemiresistor sensor for detection of CO2 at room temperature. Good sensing performance was observed upon exposing the PEI-PANI device to 50-5000 ppm CO2 in presence of humidity with negligible interference from ammonia, carbon monoxide, methane and nitrogen dioxide. The sensing mechanism relied on acid-base reaction, CO2 dissolution and amine-catalyzed hydration that yielded carbamates and carbonic acid for a subsequent pH detection. The sensing device showed reliable results in detecting an unknown concentration of CO2 in air.
authors.affiliation: Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA.
authors.forename: Sira
authors.initials: S
authors.lastname: Srinives
authors.affiliation: Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA.
authors.forename: Tapan
authors.initials: T
authors.lastname: Sarkar
authors.affiliation: Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA.
authors.forename: Raul
authors.initials: R
authors.lastname: Hernandez
authors.affiliation: Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA. Electronic address: adani@engr.ucr.edu.
authors.forename: Ashok
authors.initials: A
authors.lastname: Mulchandani
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000032:analysis*; D004867:Equipment Design; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D011094:Polyethyleneimine / Q000737:chemistry*; D013696:Temperature
chemical_list: D000814:Aniline Compounds; C416807:polyaniline; D002245:Carbon Dioxide; D011094:Polyethyleneimine
keywords: Carbon dioxide; Conducting polymer; Gas sensor; Poly(ethyleneimine); Polyaniline