Piezoresonators of a quartz-crystal microbalance were surface-coated by electro-polymerised polypyrrole films. After potentiostatic reduction at -0.9 V, the reduced PPy-coated resonators were allowed to react with solutions containing different concentrations of Cr(VI). Mass changes of the polymer film, originated by ionic transfer during the oxidation reaction of PPy by hexavalent chromium, produced frequency shifts proportional to the concentration of Cr(VI). Alternatively, frequency shifts were obtained by reaction of some antioxidants at oxidised PPy-coated resonators. Observed responses depend on several experimental parameters.
|Titolo:||A polypyrrole-coated, piezoelectric sensor for Cr(VI). Preliminary results.|
|Autori interni:||DESIMONI, ELIO (Primo)|
|Settore Scientifico Disciplinare:||Settore CHIM/01 - Chimica Analitica|
|Data di pubblicazione:||1999|
|Appare nelle tipologie:||01 - Articolo su periodico|