Single-step, size-controlled synthesis of colloidal silver nanoparticles stabilized by octadecylamine

Neelgund, Gururaj M and Karthikeyan, B and Shivashankar, SA and Oki, Aderemi (2015) Single-step, size-controlled synthesis of colloidal silver nanoparticles stabilized by octadecylamine. In: APPLIED SURFACE SCIENCE, 356 . pp. 726-731.

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Abstract

A single step process for the synthesis of size-controlled silver nanoparticles has been developed using a bifunctional molecule, octadecylamine (ODA). Octadecylamine complexes to Ag+ ions electrostatically, reduce them, and subsequently stabilizes the nanoparticles thus formed. Hence, octadecylamine simultaneously functions as both a reducing and a stabilizing agent. The amine-capped nanoparticles can be obtained in the form of dry powder, which is readily redispersible in aqueous and organic solvents. The particle size, and the nucleation and growth kinetics of silver nanoparticles could be tuned by varying the molar ratio of ODA to AgNO3. The UV-vis spectra of nanoparticles prepared with different concentrations of ODA displayed the well-defined plasmon band with maximum absorption around 425 nm. The formation of silver metallic nanoparticles was confirmed by their XRD pattern. The binding of ODA molecule on the surface of silver has been studied by FT-IR and NMR spectroscopy. The formation of well-dispersed spherical Ag nanoparticles has been confirmed by TEM analysis. The particle size and distribution are found to be dependent on the molar concentration of the amine molecule. Open aperture z-scans have been performed to measure the nonlinearity of Ag nanoparticles. (C) 2015 Published by Elsevier B.V.

Item Type:	Journal Article
Publication:	APPLIED SURFACE SCIENCE
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Silver nanoparticles; Octadecylamine; Alkylamine; FT-IR; NMR; Thermal analysis; z-Scan
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	02 Jan 2016 07:44
Last Modified:	02 Jan 2016 07:44
URI:	http://eprints.iisc.ac.in/id/eprint/53002

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