Abstract
Voltammetric response of FeS nanoparticles (NPs) dispersion based on the oxidation exchange voltammetric peak between Hg electrode and FeS NPs at around −0.45 V was studied in different electrolytes (chloride, acetate, perchlorate). Several experiments were designed to monitor in parallel to voltammetric measurements, physicochemical and surface characteristics of the formed FeS NPs (ζ-potential and size) under same experimental conditions. It was shown that recorded voltammetric peak produced by FeS NPs from bulk solution is changing with electrolyte concentration and composition, as well as observed size and ζ-potential of the studied FeS NPs. Our measurements indicate relationship between measured ζ-potential of FeS NPs dispersions and recorded voltametric peak charge and potential, pointing to a promising potential of voltammetry in characterization of physicochemical and surface chemistry features of metal sulphide NPs in water environment. The best voltammetric response is obtained in presence of small NPs, <100 nm.
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Acknowledgments
This work was supported by the UKF grant 62/10 ‘Nanoparticles in aqueous environment: electrochemical, nanogravimetric, STM and AFM studies’, and Croatian Science Foundation project IP-11-2013-1205, SPHERE. Authors thank D.Krznarić, N.Batina and anonymous reviewers for valuable discussions and suggestions.
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Marguš, M., Milanović, I. & Ciglenečki, I. Voltammetric, dynamic light scattering (DLS) and electrophoretic mobility characterization of FeS nanoparticles (NPs) in different electrolyte solutions. J Solid State Electrochem 20, 2981–2989 (2016). https://doi.org/10.1007/s10008-016-3354-9
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DOI: https://doi.org/10.1007/s10008-016-3354-9