Process Optimization for the Synthesis of Silver (AgNPs), Iron Oxide (α-Fe2O3NPs) and Core-Shell (Ag-Fe2O3CNPs) Nanoparticles Using the Aqueous Extract of Alstonia Scholaris: A Greener Approach

Navinchandra G. Shimpi1, *, Mujahid Khan1, Sharda Shirole2, Shriram Sonawane3
1 Department of Chemistry, University of Mumbai, Sant Cruz (E) 400 098, India
2 University Institute of Chemical Technology, North Maharashtra University, Jalgaon, India
3 Department of Chemical Engineering Visvesvaraya National Institute of Technolog, Nagpur

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© 2018 Shimpi et al..

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Correspondence: Address correspondence to this author at the Department of Chemistry, University of Mumbai, Sant Cruz (E) 400 098, India; E-mail:



The present study is deals with the green synthesis of silver (AgNPs), iron oxide (α-Fe2O3NPs) and core-shell (Ag-α-Fe2O3CNPs) nanoparticles using the aqueous extract of Alstonia scholaris without any catalyst, template or surfactant or any intermediate under ultrasound cavitation technique. The purpose was to facilitate the high level of dispersion with increase in rate of reaction. Further AgNPs and α-Fe2O3NPs were used to synthesis Ag-Fe2O3CNPs in aqueous extract of Alstonia scholaris under controlled ultrasound cavitation technique.


The size of AgNPs and Ag-Fe2O3CNPs can be tuned by optimizing various reaction parameters. UV-visible, X-ray diffraction spectroscopy (XRD), Transmission electron microscopy (TEM), Field emission scanning electron microscope (FE-SEM) and Fourier transform infra-red spectroscopy has been used for the characterization of silver and core shell Ag@Fe2O3 nanoparticles. TEM images clearly show the formation of core shell nanoparticles with spherical morphology.


Fourier transform infra-red spectroscopy analysis revealed that carbohydrate, polyphenols, and protein molecules were involved in the synthesis and capping of silver, iron oxide and Ag@Fe2O3 CNPs.

Keywords: Alstonia scholaris leaf extract, Ag-Fe2O3CNPs, Ultrasound cavitation, Transmission electron microscopy, AgNPs, X-ray diffraction.