Synthesis of magnetite nanoparticles stabilized by polyvinylpyrrolidone and analysis of their absorption bands
DOI:
https://doi.org/10.15587/1729-4061.2018.132057Keywords:
nanoparticles, magnetite, plasmon resonance, polyvinylpyrrolidone (PVP), absorption bands, radius of nanoparticles, aggregation resistanceAbstract
We report results of studying the synthesis of magnetite nanoparticles. The formed dispersions were explored with the use of the spectrophotometric method. The spectra of optical absorption of nanomagnetite dispersions were analyzed using the theory of plasmon oscillations. Synthesis of nanoparticles was performed in the aqueous solution and with the use of 3.5 % polyvinylpyrrolidone as dispersed medium. The ratio of salts of ferrum (III)/(II) was 1.5:1. Working concentrations of reactive substances were chosen, which resulted in the formation of stable dispersions of nanoparticles with magnetic properties. It was shown that when changing the amount and the method of introduction of ammonia solution into the system, more stable dispersions of nanoparticles are formed. As a result of the research into surface plasmon resonance of magnetite nanoparticles dispersions, it was found that all synthesized solutions are characterized by a maximum of absorption at the wavelength of 350 nm, however, intensity of absorption bands directly depends on dimensions of the particles. Magnetite nanoparticles, synthesized with the use of 3.5 % polyvinylpyrrolidone (PVP) as dispersed medium, are characterized by existence of three bands at 350 nm, 950 nm, and 1,050 nm. The possible mechanism of stabilization of magnetite nanoparticles in polyvinylpyrrolidone was proposed. In the course of the study, it was found that polyvinylpyrrolidone, on the one hand, contributes to nucleation, and on the other hand, effectively stabilizes nanoparticles.
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