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    Exploring electrochemical reactivity toward ametryn of hybrid silicate films with phosphomolybdic acid

    Year: 2018

    Journal: Mater. Sci. Eng. B-Adv. Funct. Solid-State Mater., Volume 229, MAR, page 13–19

    Authors: Olivio, Pedro H. P.; Correia, Leonardo A.; Paula, Julia H.; Oliveira, Osvaldo N., Jr.; Souza, Adriano L.

    Organizations: brazilian agency FAPESP [2015/24136-4, 2013/14262-7]

    Keywords: Phosphomolydic acid; Ormosil; Ametryn; Hybrid films

    This paper describes the synthesis of organically-modified silicates (ormosils) with phosphomolybic acid (HPMo), and their use to detect ametryn. Gold electrodes coated with an ormosil film made of 3-cyanopro-pyltriethoxysilane (CPTS) and HPMo were used to detect ametryn between 3.5 and 24 mu mol L-1 in an acidic medium. There was no evidence of electroreduction of ametryn when ormosils with HPMo and (3-glycidyloxypropyl)trimethoxysilane (GLPTS) or 3-aminopropyltriethoxysilane (APTS) were used. This difference in behavior is ascribed to aggregation in CPTS ormosil, while GLPTS and APTS ormosils displayed homogeneous surfaces, according to scanning electron microscopy. HPMo had its structure preserved in CPTS ormosil as indicated by P-31 solid-state nuclear magnetic resonance spectra. Using polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS), we inferred that the functional group dipole moments in all ormosils are oriented parallel to the interface. Control of morphology thus seems essential for applications of ormosil films, being particularly promising to monitor environmentally-relevant herbicides.
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