title: Elaboration of ammonia gas sensors based on electrodeposited polypyrrole--cobalt phthalocyanine hybrid films.
abstract: The electrochemical incorporation of a sulfonated cobalt phthalocyanine (sCoPc) in conducting polypyrrole (PPy) was done, in the presence or absence of LiClO4, in order to use the resulting hybrid material for the sensing of ammonia. After electrochemical deposition, the morphological features and structural properties of polypyrrole/phthalocyanine hybrid films were investigated and compared to those of polypyrrole films. A gas sensor consisting in platinum microelectrodes arrays was fabricated using silicon microtechnologies, and the polypyrrole and polypyrrole/phthalocyanine films were electrochemically deposited on the platinum microelectrodes arrays of this gas sensor. When exposed to ammonia, polymer-based gas sensors exhibited a decrease in conductance due to the electron exchange between ammonia and sensitive polymer-based layer. The characteristics of the gas sensors (response time, response amplitude, reversibility) were studied for ammonia concentrations varying from 1 ppm to 100 ppm. Polypyrrole/phthalocyanine films exhibited a high sensitivity and low detection limit to ammonia as well as a fast and reproducible response at room temperature. The response to ammonia exposition of polypyrrole films was found to be strongly enhanced thanks to the incorporation of the phthalocyanine in the polypyrrole matrix.
authors.affiliation: Institut UTINAM, UMR CNRS 6213, University of Franche-Comté, 16 route de Gray, 25030 Besançon, France; Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Croix du Sud, 1/4, 1348 Louvain-la-Neuve, Belgium.
authors.forename: Tilia
authors.initials: T
authors.lastname: Patois
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Sanchez
authors.forename: Franck
authors.initials: F
authors.lastname: Berger
authors.forename: Patrick
authors.initials: P
authors.lastname: Fievet
authors.forename: Olivier
authors.initials: O
authors.lastname: Segut
authors.forename: Virginie
authors.initials: V
authors.lastname: Moutarlier
authors.forename: Marcel
authors.initials: M
authors.lastname: Bouvet
authors.forename: Boris
authors.initials: B
authors.lastname: Lakard
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000641:Ammonia / Q000032:analysis*; D004553:Electric Conductivity; D004595:Electroplating; D007211:Indoles / Q000737:chemistry*; D018020:Lithium Compounds / Q000737:chemistry; D008839:Microelectrodes; D009942:Organometallic Compounds / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry; D010984:Platinum; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000393:Air Pollutants; D007211:Indoles; D018020:Lithium Compounds; D009942:Organometallic Compounds; D010472:Perchlorates; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; C063633:cobalt phthalocyanine; D010984:Platinum; D000641:Ammonia; C054684:lithium perchlorate
keywords: Ammonia; Electrochemistry; Gas sensors; Hybrid materials; Phthalocyanine; Polypyrrole