One-pot electrosynthesis of polyglycine-like thin film on platinum electrodes as transducer for solid state pH measurements.
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.
Herlem
Guillaume
G
Femto-ST/LOPMD CNRS UMR 6174, 16 route de Gray, 25030 Besancon cedex, France. guillaume.herlem@univ-fcomte.fr
Zeggari
Rabah
R
Rauch
Jean-Yves
JY
Monney
Sandrine
S
Anzola
Freddy Torrealba
FT
Guillaume
Yves
Y
André
Claire
C
Gharbi
Tijani
T
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
D010455:Peptides; C011080:polyglycine; D010984:Platinum