Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1649645 | Materials Letters | 2009 | 4 Pages |
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.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Rajesh Kumar, S. Gautam, In-Chul Hwang, Jae Rhung Lee, K.H. Chae, Nagesh Thakur,