access icon free Surface characterisation and reaction kinetics of silver nanoparticles mediated by the leaf and flower extracts of French marigold (Tagetes patula)

© The Institution of Engineering and Technology
Received 19/12/2017, Accepted 26/04/2018, Revised 14/04/2018, Published 04/05/2018

In this study, French marigold's leaf and flower were used for the synthesis of silver nanoparticles (SNPs) in order to explore their potentials towards bioreduction of Ag+ to Agᵒ. The as-synthesised SNPs were characterised using UV–Vis spectroscopy, Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction, transmission electron microscopy, and zeta-potential analysis. The results obtained showed that the particles are polydispersed with sizes in the range 15.8–42.8 nm. The bioreduction was believed to be due to the amides, aldehyde functional groups, and essential oils present in the extracts as confirmed by the FTIR analysis. The growth mechanism involved in the reaction was studied which revealed oriented attachment (OA) onwards Ostwald ripening in the case of the flower-mediated synthesis and typical OA in the leaf-mediated synthesis. The studied kinetics of the particle formation showed that the reaction is possibly a pseudo-first-order reaction with some diffusion-controlled mechanism which is driven by high surface area to volume ratio in both the leaf- and flower-mediated synthesis.

Inspec keywords: transmission electron microscopy; ultraviolet spectra; scanning electron microscopy; nanomedicine; nanoparticles; electrokinetic effects; X-ray diffraction; particle size; nanofabrication; Fourier transform infrared spectra; biomedical materials; silver; visible spectra; reaction kinetics

Other keywords: pseudofirst-order reaction; zeta-potential analysis; Tagetes patula; bioreduction; leaf-mediated synthesis; powder X-ray diffraction; transmission electron microscopy; flower extracts; Ag; surface characterisation; Fourier transform infrared spectroscopy; FTIR analysis; attachment onwards Ostwald ripening; French marigold; silver nanoparticles; UV-visible spectroscopy; aldehyde functional groups; flower-mediated synthesis

Subjects: Nanotechnology applications in biomedicine; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Biomedical materials; Visible and ultraviolet spectra (condensed matter); Electrochemistry and electrophoresis; Infrared and Raman spectra in inorganic crystals; Other methods of nanofabrication

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