Journal
MATERIALS LETTERS
Volume 61, Issue 6, Pages 1363-1367Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2006.07.049
Keywords
beta-FeOOH; nanowire arrays; thermal decomposition
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beta-FeOOH nanowire arrays were assembled into porous anodized aluminum oxide (AAO) templates by electrochemical deposition in the mixture solution of FeCl3 and (NH4)(2)C2O4. In order to obtain well-crystallized alpha-Fe2O3 and other iron oxides nanowires, beta-FeOOH nanowire arrays with amorphous crystal structure were heat-treated at different temperatures from 200 to 600 degrees C. The decomposition products were characterized by DTA, XRD, FTIR, and Mossbauer spectroscopy. When heat-treated at 200 degrees C, only 65% of beta-FeOOH decomposed, whereas, when the temperature was up to 300 degrees C, it was completely decomposed and formed poorly crystallized beta-Fe2O3. This transition temperature is higher than the 200 degrees C obtained on other beta-FeOOH materials. However, when heated above 300 degrees C, the main products are characterized as poorly well-crystallized alpha-Fe2O3 nanowires, whereas, well-crystallized arrays can be formed when the temperature was up to 600 degrees C, and this temperature is also higher compared with those temperatures observed on other beta-FeOOH materials. From Mossbauer results, the alpha-Fe2O3 nanowires were composed of fine particles in which 66% of the particles are superparamagnetic. (c) 2006 Elsevier B.V. All rights reserved.
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