Pecularities of copper and silver nanoparticles stabilization by cysteine in aqueous colloidal systems
DOI:
https://doi.org/10.15407/hftp06.03.364Keywords:
nanoparticles, copper, silver, cysteine, stabilization, size distributionAbstract
Cu and Ag nanoparticles (NPs) in colloidal solutions were synthesized by the reduction of the corresponding salts using NaBH4 followed by stabilization of NPs by amino acid cysteine (Cys). To obtain stable colloids of NPs, the optimal molar ratios of metal: Cys were determined. The average sizes of copper (2?3 nm) and silver (about 7 nm) NPs have been defined by laser correlation spectroscopy (LCS). The evolution of the spectra of surface plasmon resonance (SPR) in time and the distribution of NPs in size have been studied. The low bactericidal activity of NP/Cys composites is caused by encapsulation of metal NPs within cysteine shell and by the formation of chemical bonds of Cys molecules with Cu(I), Cu(II), and Ag(I) ions present on the surface of NPs.References
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