Abstract
Hybrid and electroactive thin films containing microcrystalline cellulose (MC) or MC modified with a phosphate group (PC) were prepared in conjunction with polyaniline (PANI) and poly(vinyl sulfonic acid) (PVS) by the layer-by-layer technique. The MC or PC was dispersed in a PANI solution employed in the deposition process, and they produced the PVS/PANI(MC) and PVS/PANI(PC) films. The ultraviolet-visible (UV-Vis) studies showed that the same amount of material was adsorbed at each stage of deposition, characterizing the PVS/PANI(MC) and PVS/PANI(PC) films as self-regulated systems. The electrochemical measurements and cyclic voltammetry were carried out in a buffered medium and showed that PVS/PANI(PC) films present higher values of current density probably due to the self-doping process of polyaniline in the presence of phosphate cellulose. The PVS/PANI(PC) film was tested in the presence of chromium VI, and in this case, the presence of a third reduction peak at 0.38 V was observed, which is characteristic of this metal, demonstrating the possibility of PVS/PANI(PC) as an active layer in the development of sensors for monitoring groundwater springs.
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