Resumo

SOMOZA CHUAY, José Alejandro; PAVONI OLIVER, Sonnia; EIREZ IZQUIERDO, José Enrique  e  BISTEL ESQUIVEL, Roberto Andrés. Analysis of the potentiometric responses of Glass/ITO and Glass/ITO/PANI-LS electrodes in pH measurement. EAC [online]. 2019, vol.40, n.2, pp. 1-9. ISSN 1815-5928.

Nowadays numerous investigations are focused on the search of new materials for the manufacture of sensors of diverse types. These materials change their properties in the presence of different chemical agents. Polyaniline (PANI) and ITO can be used as sensitive materials to detect concentrations of various ions. In this work, glass/ITO/PANI-LS and glass/ ITO working electrodes were constructed for the measurement of pH with dimensions of 2.5 cm x 1.5 cm and 2.5 cm x 2.5 cm. The deposition of the PANI-LS layers was performed using the Layer-by-Layer technique. A potentiometric measurement system for pH measurement was designed, based on the use of Virtual Instrumentation techniques. The results showed that the glass/ ITO/ PANI-LS and glass/ ITO electrodes had potentiometric responses close to nernstian in a pH measurement range of 3 to 11 units. In this measurement range there was a linear relationship between the difference in voltage and pH, which is evidenced with coefficients of linear regression and correlation higher than 0.9. The results obtained experimentally are similar to those reported in the literature with other materials.

Palavras-chave : Glass; ITO; PANI; LS; electrodes; pH measurement.

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