title: Silver or gold deposition onto magnetite nanoparticles by using plant extracts as reducing and stabilizing agents.
abstract: In this paper, we describe an environmentally friendly procedure to produce silver (Ag) or gold (Au)-deposited magnetite nanoparticles by using plant extracts (Ligustrum vulgare) as reducing and stabilizing agents. Firstly, magnetite nanoparticles (∼6 nm) with superparamagnetic properties - SPIONs - were synthesized by co-precipitation of Fe(+ 2) and Fe(+ 3) ions. Color changes indicated the differing amounts of Au and Ag ions reduced and deposited on to the SPIONs when the plant extracts were used. UV-vis and transmission electron microscope (TEM) with energy dispersive X-ray (EDX) apparatus confirmed the metallic deposition. Magnetic saturation decreased when the amount of the metallic deposition increased, which was measured by vibrating sample magnetometry (VSM). Due to the molecules coming into contact with - and even remaining on - the surface of the nanoparticles after aggressive washing procedures, the Ag/Au-deposited SPIONs were stable, and almost no agglomeration was observed for months. Fourier Transform Infrared (FTIR) spectra depicted that functional groups such as carboxylic and ketone groups, which are most probably responsible for the reduction and stabilization of Ag/Au- carrying magnetite nanoparticles, originated from the plant extract. The proposed route was facile, viable, and reproducible, and it should be stressed that nanoparticles do contain only safe biomolecules as stabilizing agents on their surfaces.
authors: a Department of Chemical Engineering , Bioengineering Division, Hacettepe University and Biyomedtek/Nanobiyomedtek , Beytepe, Ankara 06800 , Turkey.
authors: Araz
authors: A
authors: Norouz Dizaji
authors: a Department of Chemical Engineering , Bioengineering Division, Hacettepe University and Biyomedtek/Nanobiyomedtek , Beytepe, Ankara 06800 , Turkey.
authors: Mehmet
authors: M
authors: Yilmaz
authors: a Department of Chemical Engineering , Bioengineering Division, Hacettepe University and Biyomedtek/Nanobiyomedtek , Beytepe, Ankara 06800 , Turkey.
authors: Erhan
authors: E
authors: Piskin
mesh_terms: D006046:Gold / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D029592:Oleaceae / Q000737:chemistry*; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D058185:Magnetite Nanoparticles; D010936:Plant Extracts; D012834:Silver; D006046:Gold
keywords: Ligustrum vulgare plant extract; green synthesis; superparamagnetic iron oxide nanoparticles; tunable gold and silver deposition