Abstract
ABSTRACT Green synthesis of metal nanoparticles and nanocomposites offers numerous advantages over conventional methods. The present study deals with the synthesis of Ag nanoparticles and Ag@MoS2 nanocomposites by Dracocephalum kotschyi extract as a reductant and a stabilising agent. The influence of extract volume, reaction temperature, contact time and pH on the synthesis of d-AgNPs was investigated. Further, the modified MoS2 using D. kotschyi extract (d-MoS2) could deposit Ag+ ions onto the MoS2 nanosheets surface, reduce the ions to AgNPs, and stabilise the reduced particles effectively. The synthesised nanostructures were characterised by XRD, SEM-EDS, TEM, Zeta potential and FT-IR analysis. Ag nanoparticles are spherical with diameter of 58–75 nm for d-AgNPs and 35–55 nm for Ag@d-MoS2, respectively. The d-AgNPs exhibited high activity in the inhibition of acetylcholinesterase. Also, loading of AgNPs on MoS2 nanosheets resulted in the increase of inhibitory activity against acetylcholinesterase compared to MoS2 nanosheets.
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