No abstract

Electropolymerisation of nonconducting polymer, poly-(1,2-diaminobenzene) on the top of Prussian Blue (PB) modified electrode led to significant improvement of resulting hydrogen peroxide transducer selectivity and operational stability. The reported transducer retained 100% of response during 20 h under the continuous flow of 0.1 mM H 2 O 2 , and thus improves the stability level in selective peroxide detection by one order of magnitude. The selectivity value of the PB -poly(1,2-DAB) based H 2 O 2 sensor in relation to ascorbate is approximately 600. No signals to acetaminophen and urate were investigated. PB -poly(1,2-diaminobenzene) modified electrode allows the detection of H 2 O 2 in the flow-injection mode down to 10 À 7 M with the sensitivity 0.3 A M À 1 cm À 2 , which is only two times lower compared to the uncovered PB based transducer. D

An approach to improve the analytical performance of a Prussian Blue (PB)-based hydrogen peroxide transducer is described. In support of this objective, both the stabilizing and anti-interferent properties of nonconducting films were used. Electropolymerization on the top surface of PB modified electrodes is possible due to the high oxidizing ability of Berlin Green, and the growth of nonconductive polymers may be independently monitored by investigating the redox activity of the inorganic polycrystal. The best performance characteristics, which are advantageous over existing H 2 O 2 sensors, were obtained for PB electrodes covered with electropolymerized o-phenylenediamine (1,2-diaminobenzene). The reported transducer remained at the 100% response state for more than 20 h under continuous flow of 0.1-mM hydrogen peroxide (flow rate 1 ml min 1 ), which improves the stability level among the selective H 2 O 2 sensors by one order of magnitude. The selectivity factor of the PB-poly (1,2-diaminobenzene) based transducer relative to ascorbate is nominally 600. PB-poly(1,2-diaminobenzene) modified electrode allows the detection hydrogen peroxide in the flow-injection mode down to 10 7 M with sensitivity of 0.3 A M 1 cm 2 , which is two times lower compared to the uncovered PB-based transducer.