Issue 2, 2010
From the journal:

CrystEngComm

Controlled growth of single-crystalline, nanostructured dendrites and snowflakes of α-Fe2O3: influence of the surfactant on the morphology and investigation of morphology dependent magnetic properties

S. Bharathi,ab   D. Nataraj,*ab   M. Seetha,ab   D. Mangalaraj,bc   N. Ponpandian,bc   Y. Masuda,d   K. Senthile  and  K. Yongf  

* Corresponding authors

a Thin Films and Nanomaterials Lab, Department of Physics, Bharathiar University, Coimbatore - 641046, India
E-mail: de.natraj@gmail.com

b DRDO-BU Centre for Life Sciences, Bharathiar University, Coimbatore - 641046, India

c Department of Nanoscience and Technology, Bharathiar University, Coimbatore - 641046, India

d National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Japan

e Centre for Information Materials, Pohang University of Science and Technology, Pohang, South Korea

f Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, South Korea

Abstract

Single-crystalline, nanostructured dendrites, single and double-layered snowflakes of hematite (α-Fe2O3) were synthesized by a well controlled, surfactant-assisted hydrothermal reaction of K3[Fe(CN)6]. By varying the preparatory conditions such as precursor concentration and type of surfactant, we could establish precise control on the morphology of the sample. X-Ray diffraction, Raman analysis and X-ray photoelectron spectroscopic studies have confirmed that the as grown morphologies were hematite. Dendrites were obtained due to weak dissociation of the precursor and controlled diffusion of α-Fe2O3 nanoparticles under non-equilibrium conditions which attach and grow along certain preferred crystal facets. In the presence of a surfactant, single and double-layered snowflakes were formed. The type of surfactant and the nature of micelle formation were proposed to be the key factor for the observed snowflakes and the single or double-layered growth. Magnetic studies have shown morphology dependent magnetic properties with variation in the coercivity values for dendrites, single and double-layered snowflakes.

Graphical abstract: Controlled growth of single-crystalline, nanostructured dendrites and snowflakes of α-Fe2O3: influence of the surfactant on the morphology and investigation of morphology dependent magnetic properties

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Article information

DOI
https://doi.org/10.1039/B910550F
Article type
Paper
Submitted
28 May 2009
Accepted
26 Aug 2009
First published
08 Sep 2009

CrystEngComm, 2010,12, 373-382

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Controlled growth of single-crystalline, nanostructured dendrites and snowflakes of α-Fe2O3: influence of the surfactant on the morphology and investigation of morphology dependent magnetic properties

S. Bharathi, D. Nataraj, M. Seetha, D. Mangalaraj, N. Ponpandian, Y. Masuda, K. Senthil and K. Yong, CrystEngComm, 2010, 12, 373 DOI: 10.1039/B910550F

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