Issue 7, 2008
From the journal:

Journal of Materials Chemistry

A new role for surfactants in the formation of cobalt nanoparticles†

Rohini M. de Silva,a   Vadim Palshin,a   K. M. Nalin de Silva,b   Laurence L. Henryc  and  Challa S. S. R. Kumar*a  

* Corresponding authors

a Centre for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Hwy, Baton Rouge, LA, USA
E-mail: ckumar1@lsu.edu
Fax: +1-225-578-6954
Tel: +1-225-578-9320

b Department of Chemistry, Louisiana State University, LA, USA

c Department of Physics, Southern University and A&M College, Baton Rouge, LA, USA

Abstract

During wet-chemical synthesis of nanoparticles it is believed that surfactants interact with the particles after their nucleation thereby controlling their crystal structure, shape and size. Contrary to this, our investigations presented in this paper reveal a new role for surfactants: influencing the reaction pathways, prior to nucleation, leading to the formation of cobalt nanoparticles. The results from the mechanistic investigation of the influence of various surfactants on the formation of cobalt nanoparticles carried out using time dependent FT-IR spectroscopy support this observation. The utilization of different surfactants such as oleic acid (OA), trioctylphosphine oxide (TOPO), octadecylamine (ODA), and trioctylphosphine (TOP) led to differences in reaction pathways and reaction intermediates, prior to the nucleation, leading to the formation of Co nanoparticles with very different properties. The particle size and size distribution were obtained from transmission electron microscopy (TEM). The electronic and geometric properties of the cobalt nanoparticles obtained were determined using synchrotron radiation based X-ray absorption spectroscopy (XAS) and the magnetic properties were measured using SQUID magnetometry.

Graphical abstract: A new role for surfactants in the formation of cobalt nanoparticles

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Article information

DOI
https://doi.org/10.1039/B714456C
Article type
Paper
Submitted
19 Sep 2007
Accepted
30 Nov 2007
First published
03 Jan 2008

J. Mater. Chem., 2008,18, 738-747

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A new role for surfactants in the formation of cobalt nanoparticles

R. M. de Silva, V. Palshin, K. M. N. de Silva, L. L. Henry and C. S. S. R. Kumar, J. Mater. Chem., 2008, 18, 738 DOI: 10.1039/B714456C

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