Record number :
Title of article :
Conditioning treatment to improve the potentiometric pH response of polydiphenylamine modified electrodes
Author/Authors :
Rodrيguez Presa، نويسنده , , M.J. and Posadas، نويسنده , , D. and Florit، نويسنده , , M.I.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
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Abstract :
The potentiometric pH response of gold electrodes, modified with polydiphenylamine (PDPA) films was studied. These were obtained by electropolymerization of saturated diphenylamine in 3.7 M HClO4 solutions by cycling the working electrode potential between −0.10 and 0.65 V versus saturated calomel electrode (SCE). The PDPA modified electrodes were subjected to a conditioning treatment consisting of a sequence of electrochemical procedures performed in 1 M H2SO4 solutions. This treatment improves the linearity and sensitivity of the pH response and enlarges to 0 ≤ pH ≤ 11 the measuring range. The potential versus pH slope is 0.041 V/pH unit; this value is due to the fact that the conditioning treatment produces an effective pK distribution that is much wider that in the as made PDPA films.
Keywords :
Modified electrode , Polydiphenylamine , pKa distribution , Potentiometric pH response
Journal title :
Sensors and Actuators B: Chemical
Link To Document :