Growth of La2CuO4 nanofibers under a mild condition by using single walled carbon nanotubes as templates
โ Scribed by Lizhen Gao; Xiaolin Wang; Hui Tong Chua; Sibudjing Kawi
- Book ID
- 104029591
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 494 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0022-4596
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โฆ Synopsis
La 2 CuO 4 nanofibers (ca. 30 nm in diameter and 3 mm in length) have been grown in situ by using single walled carbon nanotubes (SWNTs; ca. 2 nm in inner diameter; made via cracking CH 4 over the catalyst of Mg 0.8 Mo 0.05 Ni 0.10 Co 0.05 O x at 800 1C) as templates under mild hydrothermal conditions and a temperature around 60 1C. During synthesis, the surfactant poly(ethylene glycol)-blockpoly(propylene glycol)-block-poly(ethylene glycol) and H 2 O 2 were added to disperse SWNTs and oxidize the reactants, respectively. The structure of La 2 CuO 4 nanofibers was confirmed by powder X-ray diffraction (XRD) and their morphologies were observed with field emission scanning electron microscope (FESEM) at the hydrothermal synthesis lasting for 5, 20 and 40 h, respectively. The La 2 CuO 4 crystals grew from needle-like (5 h) through stick-like (20 h) and finally to plate-like (40 h) fibers. Twenty hours is an optimum reaction time to obtain regular crystal fibers. The La 2 CuO 4 nanofibers are probably cubic rather than round and may capsulate SWNTs.
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