Studies on N-alkylated Polyaniline and its application to measurement of hydrogen peroxyde at neutral pH Diego L. Raffa 1 , K. Tong Leung 2 , Fernando Battaglini 1 1 Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires 2 Department of Chemistry, University of Waterloo
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Studies on N-alkylatedPolyaniline and its
application to measurementof hydrogen peroxyde at
neutral pHDiego L. Raffa1, K. Tong Leung2, Fernando Battaglini1
1 Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires2 Department of Chemistry, University of Waterloo
Redox and Acid-Base Equilibria of Polyaniline
NH
NH
NH
NH
N
N N
N
NH
NH
N
N
NH
NH
N+
H
N+
H
A-
A-
2A- -2e -2A- -2e
2A- +2H+
Insulating
Insulating
Conducting
How to use it in Sensors
i
time
C4C3C2C1
C1<C2<C3<C4
GOxPoly(o-phenylendiamine)
PANI
Carbon Electrodes
HRP
V
POLYMER
CARBON BAND
INSULATOR
Examples
P. N. Bartlett y P. R. Birkin; Synthetic Metals, 61 (1993) 15-21 P. N. Bartlett; P. R. Birkin; J.H Wang; F. Palmisano; G. De
Benedetto; Anal.Chem. 1998, 70, 3685-3694.
Attempt to improve the problem of pH
•Polymerization in presence of PSS orPVS•A Donnan potential that keeps positiveions in the film is created
Results:•The polymer conductivity is temporarily improved at pHs between 6 and 7•After some minutes, conductivity decreases and is only recovered by immersion in acid
•Certain independence between conductivity of PANI and pH can be achieved•The procedure can be made simple and fast by changing reaction temperature and time
•A working pH of 7 can be achieved forsensors based on PANI•Analysis time is still too long and must be shortened to optimize the method
Acknowledgement:
•CONICET•Fundación Antorchas
•DQIA y QF-INQUIMAE•Lab group for making me feel at home