Preparation and Characterization of α-Fe2O3 polyhedral nanocrystals via annealing technique

Title
Preparation and Characterization of α-Fe2O3 polyhedral nanocrystals via annealing technique
Authors
Rajesh KumarS. GautamIn-Chul HwangJae Rhung Lee채근화Nagesh Thakur
Keywords
Nanomaterials; Crystal structure; Annealing temperature; Polyhedral; Gas Flow
Issue Date
2009-04
Publisher
Materials letters
Citation
VOL 63, NO 12, 1047-1050
Abstract
Polyhedral nanocrystals of α-Fe2O3 are successfully synthesized by annealing FeCl3 on silicon substrate at 1000 °C in the presence of H2 gas diluted with argon (Ar). Uniformly shaped polyhedral nanoparticles (diameter ~50–100 nm) are observed at 1000 °C and gases flow rate such as; Ar=200 ml/min and H2=150 ml/min. Non-uniform shaped nanoparticles (diameter ~20–70 nm) are also observed at an annealing temperature of 950 °C with lower gases flow rate (Ar=100 ml/min and H2=75 ml/min). Nanoparticles are characterized in detail by field-emission electron microscopy (FE-SEM), energy dispersive X-ray (EDX) and high resolution transmission electron microscopy (HRTEM) techniques. HRTEM study shows well resolved (110) fringes corresponding to α-Fe2O3, and selected area diffraction pattern (SADP) confirms the crystalline nature of α-Fe2O3 polyhedral nanoparticles. It is observed that polyhedral formation of α-Fe2O3 nanocrystals depends upon annealing temperature and the surface morphology highly rely on the gas flow rate inside the reaction chamber.
URI
http://pubs.kist.re.kr/handle/201004/35029
ISSN
0167-577X
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