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Nanostructured films inorganic-organic hybrids for environmental sensors


This project aims to develop sensors to detect heavy metals, based on nanostructured films obtained by the techniques of Langmuir-Blodgett (LB) and layer by layer. The sensor units are composed of ultra-thin films of conducting polymers and nanoclays deposited on solid substrates. The flexibility of controlling the thickness of the films offered by these techniques can be exploited to achieve low response times of sensor units. The films are preferably made of polyaniline (PAni) and the group of smectite clays, and montmorillonite (MMT). Depending on the manufacturing technique of the film materials will be co-dispersed, or used in the form of bilayers. These units will be immersed in different liquid systems and the acquisition and characterization of the results will be made by electrochemical measurements. The mixed films of polymers with clays and their interaction with the analytes, will be studied with spectroscopic techniques such as absorption in the UV-Vis, FTIR and Raman spectroscopy, electrochemical (cyclic voltammetry), atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The films are also characterized by surface plasmon resonance (Surface Plasmon Resonance (SPR)), which determines the thickness and investigating molecular interactions between the organic and inorganic materials. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE BARROS, ANERISE; FERREIRA, MARISELMA; LEOPOLDO CONSTANTINO, CARLOS JOSE; RIBEIRO BORTOLETO, JOSE ROBERTO; FERREIRA, MARYSTELA. Synergy between Polyaniline and OMt Clay Mineral in Langmuir-Blodgett Films for the Simultaneous Detection of Traces of Metal Ions. ACS APPLIED MATERIALS & INTERFACES, v. 7, n. 12, p. 6828-6834, . (12/16158-0, 11/00733-2)
CAMPOS, PAULA P.; MORAES, MARLI L.; VOLPATI, DIOGO; MIRANDA, PAULO B.; OLIVEIRA, JR., OSVALDO N.; FERREIRA, MARYSTELA. Amperometric Detection of Lactose Using beta-Galactosidase Immobilized in Layer-by-Layer Films. ACS APPLIED MATERIALS & INTERFACES, v. 6, n. 14, p. 11657-11664, . (12/16158-0)
DE BARROS, ANERISE; LEOPOLDO CONSTANTINO, CARLOS JOSE; DA CRUZ, NILSON CRISTINO; RIBEIRO BORTOLETO, JOSE ROBERTO; FERREIRA, MARYSTELA. High performance of electrochemical sensors based on LbL films of gold nanoparticles, polyaniline and sodium montmorillonite clay mineral for simultaneous detection of metal ions. Electrochimica Acta, v. 235, p. 700-708, . (11/00733-2, 12/16158-0)
DE BARROS, A.; CONSTANTINO, C. J. L.; BORTOLETO, J. R. R.; DA CRUZ, N. C.; FERREIRA, M.. Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions. SENSORS AND ACTUATORS B-CHEMICAL, v. 236, p. 408-417, . (12/16158-0, 11/00733-2)

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