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A size-controlled synthesis and characterization of mixed monolayer protected silver-S-(CH2)11-NHCO-coumarin nanoparticles and their Raman activities

Published online by Cambridge University Press:  08 June 2015

Mbuso Mlambo ,
Phumlane S. Mdluli ,
Poslet Shumbula ,
Amanda Skepu ,
Robert Tshikhudo  and
Nosipho Moloto
Mbuso Mlambo
Affiliation:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa; and Advanced Materials Division, Nanotechnology Innovation Centre, Mintek, Private Bag X3015, Randburg 2125, South Africa
Phumlane S. Mdluli
Affiliation:
Durban University of Technology, Faculty of Applied Sciences, Department of Chemistry, Durban 4000, South Africa
Poslet Shumbula
Affiliation:
Advanced Materials Division, Nanotechnology Innovation Centre, Mintek, Private Bag X3015, Randburg 2125, South Africa
Amanda Skepu
Affiliation:
Advanced Materials Division, Nanotechnology Innovation Centre, Mintek, Private Bag X3015, Randburg 2125, South Africa
Robert Tshikhudo
Affiliation:
Advanced Materials Division, Nanotechnology Innovation Centre, Mintek, Private Bag X3015, Randburg 2125, South Africa
Nosipho Moloto*
Affiliation:
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa
*
a)Address all correspondence to this author. e-mail: nosipho.moloto@wits.ac.za
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Abstract

The study reports the functionalization of the size-controlled synthesized silver nanoparticles (AgNPs) with coumarin derivative. The size and the morphology of the as-synthesized AgNPs were obtained in the presence of glycerol and sodium citrate which acted as the reducing agent which led to nucleation of silver ions thus yielding different sizes of AgNPs. The obtained AgNPs were functionalized with different stoichiometric ratios of [HS-(CH2)11-NHCO-coumarin:HS-PEG-(CH2)11COOH] to form mixed monolayer protected silver clusters and their Raman activities were evaluated to determine the effect of particle size on the enhancement factor (EF). The functionalization and the stability of AgNPs were confirmed using a combination of techniques, namely UV–Visible spectroscopy, transmission electron microscopy, Zetasizer, and Raman spectroscopy. The obtained Raman spectra were used to calculate the EF of the HS-(CH2)11-NHCO-coumarin adsorbed on AgNPs, which was observed to increase with an increase in size of AgNPs from 16 to 30 nm. Increasing the particle size to 43 nm lowered the EF by 10-fold and hence an optimal size of ∼30 nm was achieved for the coumarin derivative adsorbate.

Keywords

AgnanoscaleRaman spectroscopy
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1934 - 1942
Copyright
Copyright © Materials Research Society 2015 

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