title: One-pot electrosynthesis of polyglycine-like thin film on platinum electrodes as transducer for solid state pH measurements.
abstract: The anodic oxidation of concentrated glycine based aqueous electrolyte on smooth platinum electrode leads to a strongly grafted polyglycine-like coating on the surface in an irreversible way. Due to the proton affinity towards amino groups of polyglycine (PG), the electrodeposited thin film was used as receptor for solid potentiometric pH sensor. In order to reach local pH measurement, we developed miniaturized microelectrodes on glass substrate thanks to photolithography process. We used silver chloride on silver as the reference electrode. The couple (silver chloride, PG based platinum electrode) of microelectrodes gives linear potentiometric response vs. pH in the range [2-12], reversibly and with a sensitivity of 52.4 mV/pH (for 1mm electrode size). PG based pH electrode is compared to other organic polymer based pH receptor such as linear polyethylenimine (L-PEI), polyaniline (PANI) and glass membrane.
authors.affiliation: Femto-ST/LOPMD CNRS UMR 6174, 16 route de Gray, 25030 Besancon cedex, France. guillaume.herlem@univ-fcomte.fr
authors.forename: Guillaume
authors.initials: G
authors.lastname: Herlem
authors.forename: Rabah
authors.initials: R
authors.lastname: Zeggari
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Rauch
authors.forename: Sandrine
authors.initials: S
authors.lastname: Monney
authors.forename: Freddy Torrealba
authors.initials: FT
authors.lastname: Anzola
authors.forename: Yves
authors.initials: Y
authors.lastname: Guillaume
authors.forename: Claire
authors.initials: C
authors.lastname: André
authors.forename: Tijani
authors.initials: T
authors.lastname: Gharbi
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D004563:Electrochemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010455:Peptides / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D011199:Potentiometry; D011786:Quality Control
chemical_list: D010455:Peptides; C011080:polyglycine; D010984:Platinum