Preparation and characterization of alpha-Fe2O3 polyhedral nanocrystals via annealing technique
- Title
- Preparation and characterization of alpha-Fe2O3 polyhedral nanocrystals via annealing technique
- Date Issued
- 2009-05
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- Polyhedral nanocrystals of alpha-Fe2O3 are successfully synthesized by annealing FeCl3 on silicon substrate at 1000 degrees C in the presence of H-2 gas diluted with argon (Ar). Uniformly shaped polyhedral nanoparticles (diameter -50-100 nm) are observed at 1000 degrees C and gases flow rate such as
Ar=200 ml/min and H-2 = 150 ml/min. Non-uniform shaped nanoparticles (diameter similar to 20-70 nm) are alsoobserved at an annealing temperature of 950 degrees 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 alpha-Fe2O3, and selected area diffraction pattern (SADP) confirms the crystalline nature of alpha-Fe2O3 polyhedral nanoparticles. It is observed that polyhedral formation of alpha-Fe2O3 nanocrystals depends upon annealing temperature and the surface morphology highly rely on the gas flow rate inside the reaction chamber. (C) 2009 Elsevier B.V. All rights reserved.
- Keywords
- Nanomaterials; Crystal structure; Annealing temperature; Polyhedral; Gas flow; MAGNETIC-PROPERTIES; COPT3 NANOCRYSTALS; SIZE CONTROL; PARTICLES; UNIFORM; MORPHOLOGY; NANOWIRES; NANORODS; GROWTH; ARRAYS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29012
- DOI
- 10.1016/J.MATLET.200
- ISSN
- 0167-577X
- Article Type
- Article
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