Issue 13, 2010
From the journal:

Physical Chemistry Chemical Physics

Elucidation of the role of hexamine and other precursors in the formation of magnetitenanorods and their stoichiometry

Hema Singh,a   Shrikant Bhagwat,a   Samuel Jouen,b   Benoît Lefez,b   Anjali A. Athawale,*a   Beatrice Hannoyerb  and  Satishchandra Ogale*c  

* Corresponding authors

a Department of Chemistry, University of Pune, Pune 411 007, India

b Groupe de Physique des Matériaux, Université de Rouen, France

c National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune, India
E-mail: sb.ogale@ncl.res.in
Fax: +91-20-2590-2636
Tel: +91-20-2590-2260

Abstract

Hexamine is known to assist anisotropic growth of metal oxides and the same is also found to be true for magnetite nanosynthesis. In this work we elucidate the role of hexamine and other precursors in the formation of magnetite nanorods by the hydrothermal route and their stoichiometry. Various others hydrolyzing agents such as sodium hydroxide (NaOH), sodium hydroxide + hexamine, ammonia (NH3), ammonia + formaldehyde are also studied. The synthesized nanoparticles are characterized with the help of various techniques such as X-ray diffraction (XRD), FT-IR spectroscopy, UV-VIS-NIR spectroscopy, transmission electron microscopy (TEM), Mössbauer spectroscopy and SQUID magnetization measurements. It is found that only when ferric chloride, ferrous ammonium sulfate (FAS) and hexamine are used, well defined nanorods are formed. When sodium hydroxide and hexamine are used as a hydrolyzing system nearly spherical nanoparticles with small size (∼13 nm) are formed, as compared to the case of sodium hydroxide alone which leads to bigger cube like nanoparticles. Interestingly the decomposition products of hexamine do not lead to nanorod formation. Thus, slow decomposition of hexamine at elevated temperature and the consequent slow rise in pH is the key to the anisotropic growth of the iron oxide system.

Graphical abstract: Elucidation of the role of hexamine and other precursors in the formation of magnetite nanorods and their stoichiometry

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Article information

DOI
https://doi.org/10.1039/B917407A
Article type
Paper
Submitted
24 Aug 2009
Accepted
19 Jan 2010
First published
19 Feb 2010

Phys. Chem. Chem. Phys., 2010,12, 3246-3253

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Elucidation of the role of hexamine and other precursors in the formation of magnetite nanorods and their stoichiometry

H. Singh, S. Bhagwat, S. Jouen, B. Lefez, A. A. Athawale, B. Hannoyer and S. Ogale, Phys. Chem. Chem. Phys., 2010, 12, 3246 DOI: 10.1039/B917407A

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