Rapid synthesis and optical properties of hematite (α-Fe2O3) nanostructures using a simple thermal decomposition method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:550

Article

Al-Gaashani, R.^1,2  Radiman, S.¹  Tabet, N.^3,4  Daud, A. R.¹ 

[1] Univ Kebangsaan Malaysia, Fac Sci & Technol, Sch Appl Phys, Bangi 43600, Selangor, Malaysia

[2] Thamar Univ, Dept Phys, Dhamar, Yemen

[3] King Fahd Univ Petr & Minerals, Dept Phys, Dhahran 31261, Saudi Arabia

[4] King Fahd Univ Petr & Minerals, Ctr Res Excellence Renewable Energy, Dhahran 31261, Saudi Arabia

关键词: alpha-Fe2O3;    Nanostructures;    Thermal decomposition;    Optical properties;    XPS;   

DOI  :  10.1016/j.jallcom.2012.10.150

来源: Elsevier

【 摘 要 】

Hematite nanostructures were prepared by a simple technique using the thermal decomposition of iron (III) nitrate 9-hydrate at different temperatures under air atmosphere. Observations using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) showed that the morphology of the nanostructures changed as the temperature was varied while their size increased with increasing preparation time. Samples prepared at 300, 400, and 500 degrees C were made of particles with a quantum dots (QDs) size. X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) confirmed that the as-synthesized powders are pure alpha-Fe2O3. The optical energy gap of the samples varied from 3.2 eV to 2.7 eV as the preparation temperature increased from 300 degrees C to 600 degrees C. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

【 授权许可】

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