An investigation of the synergistic effect between magnetite nanoparticles and polypyrrole in nanostructured layer-by-layer films |
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| Authors: | Lucas F de Lima Cristiane C Maciel André L Ferreira Rafael J G Rubira Carlos J L Constantino Marystela Ferreira |
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| Affiliation: | 1. Center of Science and Technology for Sustainability (CCTS), Federal University of São Carlos (UFSCar), Sorocaba, SP, Brazil;2. Sao Paulo State University Julio de Mesquita Filho (UNESP), Sorocaba, SP, Brazil;3. Sao Paulo State University Julio de Mesquita Filho (UNESP), Presidente Prudente, SP, Brazil |
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| Abstract: | In this paper, we report the controlled fabrication of layer-by-layer (LbL) films deposited on gold substrates with three different supramolecular architectures using polypyrrole (Ppy) and magnetite nanoparticles (Fe3O4-np), besides conventional poly(allylamine hydrochloride) (PAH) e poly(vinyl sulfonic acid) (PVS) polyelectrolytes, demonstrating the synergistic effect between Ppy and Fe3O4-np such as a result of their interaction. Modified gold electrodes were analyzed by contact angle (wettability), surface plasmon resonance (SPR), raman spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The (Fe3O4-np/Ppy)3 architecture was also evaluated by scanning electron microscopy. The modified gold electrodes present more homogeneous covering, higher electron transfer and a decrease of resistance with the incorporation of the nanostructured materials such as Ppy and Fe3O4-np forming (Fe3O4-np/Ppy)3 LbL film. The results carried out in this study suggest that the (Fe3O4-np/Ppy)3 LbL film can be applied as a possible electrochemical or optical non-enzymatic sensor for analytical detection. |
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| Keywords: | Layer-by-Layer microscopy optical properties self-assembly |
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