Journal
MATERIALS RESEARCH BULLETIN
Volume 80, Issue -, Pages 44-52Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2016.03.029
Keywords
Nanostructures; Crystal growth; Transmission electron microscopy (TEM); Crystal structure; Semiconductivity
Categories
Funding
- Mexican Secretariat of Public Education/Sub-Secretaria de Educacion Publica (SEP-PROMEP)
- Mexican Council of Science and Technology/Consejo Nacional de Ciencia y Tecnologia (CONACYT)
- Universidad Autonoma de Nuevo Leon (UANL) under research project Redes tematicas de colaboracion [CB-179486]
- Universidad Autonoma de Nuevo Leon (UANL) under research project PAICYT
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Morphological, microstructural and vibrational properties of hematite (alpha-Fe2O3) nanocrystals with a rhombohedral shape and rounded edges, obtained by forced hydrolysis of iron(III) solutions under a fast nucleation, have been investigated in detail as a function of aging time. These studies allowed us to propose a detailed formation mechanism and revealed that these nanocrystals are composed of four {104} side facets, two {110} faces at the edges of the long diagonal of the nanocrystals and two {-441} facets as the top and bottom faces. Also, the presence of nanoscopic pores and fissures was evidenced. The vibrational bands of such nanocrystals were shifted to lower frequencies in comparison with bulk hematite ones as the nanocrystal size was reduced due to phonon confinement effects. Also, the indirect and direct transition band gaps displayed interesting dependences on the aging time arising from quantum confinement and surface effects (C) 2016 Elsevier Ltd. All rights reserved.
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