| Autor: |
Aleksandar T. Dimitrov, Perica Paunović, Anita Grozdanov, Aleksandar Petrovski |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
NATO Science for Peace and Security Series B: Physics and Biophysics ISBN: 9789402420449 |
| DOI: |
10.1007/978-94-024-2018-0_29 |
| Popis: |
The aim of this study is to analyze the sensor activity of polyaniline (PANI) based nanocomposites reinforced with carbon nanostructures (CNSs) such as graphene (G) and multi walled carbon nanotubes (MWCNT), in order to use them as pH sensors. For their realization the nanocomposites are applied on screen printed electrode (SPE) by means of steady state electrochemical polarization. The optimal conditions for electropolymerization of the PANI/CNSs on gold SPE were defined by steady state polarization measurements. It was found that the optimal potential for electropolymerization of the PANI based nanocomposites on gold SPE is 1.15 V vs. saturated calomel electrode (SCE). The prepared nanosensors are characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The stability of the nanosensors was tested in synthetic sea water with pH = 8.4 and the most stabile was 3% MWCNT reinforced PANI nanocomposite at average of 12 min time, with minimal deviations for a period of more than 30 days. The results show also that decreasing the temperature leads to lower resistivity, which is attributed to reduced diffusion in the process of doping and dedoping. On the other side this reflects in the increased stabilization time of the nanosensor. Tests were conducted by two probe method to study the sensor activity of the nanocomposites against pH changes. The pH changes varied from 8.49 to 7.96 and represent simulation of the changes happening in real sea water. It was found that with changing the pH of the water, time of 1 min was needed for stabilization of the sensor resistivity. The resistivity changes versus pH changes show linear dependence by increasing the resistivity of the nanosensor with decreasing the pH of the water. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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