Influence of various capping agents on optical properties and stability of MnS nanoparticles

V.G. Pylypko; O.V. Krupko; P.M. Fochuk

doi:10.15330/pcss.23.4.678-685

Authors

V.G. Pylypko Yuri Fedjkovych Chernivtsy National University, Chernivtsy, Ukraine
O.V. Krupko Bukovinian State Medical University, Chernivtsi, Ukraine
P.M. Fochuk Yuri Fedjkovych Chernivtsy National University, Chernivtsy, Ukraine

DOI:

https://doi.org/10.15330/pcss.23.4.678-685

Keywords:

manganese (II) sulphide, nanoparticles, synthesis, L–cysteine, thioglicolic acid, citrate-ions, absorbance spectra, Atomic Force Microscopy, Energy Dispersive X–ray analysis

Abstract

Two thiols (L-cysteine and thioglycolic acid) as well as citrate-anion were employed as coordinating reagents to control the MnS nanoparticles nucleation and growth at various pH in aqueous media. The obtained colloids were characterized by means of UV–visible spectroscopy and atomic force microscopy. Mass fraction of elements was estimated by Energy Dispersive X– ray. Effect of the nanoparticles forming ions (Mn²⁺ and S^2-) molar ratio as well as the capping agents nature and content (the ligands coordination number c. n. = 2; 4 and 6) on UV–vis absorbance spectra was studied. It was determined that Mn²⁺– ions amount and the coordination number of the stabilizers needed for effective capping of the MnS nanoparticles are close in the three studied cases. Possibility of Mn(OH)₂formation as an additional product of S^2-- and Mn²⁺– ions interaction in aqueous medium is discussed.

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