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Raman spectroscopy of the transition of α-gallium oxyhydroxide to β-gallium oxide nanorods

By Yanyan Zhao, Jing Yang and Ray L. Frost

Abstract

The thermo-Raman spectra of synthesised α-gallium oxyhydroxide nanorods proves the transition of α-gallium oxyhydroxide to β-gallium oxide nanorods occurs above 350 degrees Celsius but below 400 degrees Celsius. Scanning electron microscopy proves the morphology of the α-gallium oxyhydroxide nanorods is retained upon calcination to β-gallium oxide. X-ray diffraction shows that the nanorods are α-gallium oxyhydroxide converting upon calcination to β-gallium oxide. \ud Intense Raman bands are observed at 190, 262, 275, 430, 520, 605 and 695 cm-1 which undergo a red shift of ~5 cm-1 upon heating to 350 degrees Celsius. Upon thermal treatment above 350 degrees Celsius the Raman spectrum shows a significantly different pattern. Raman bands are observed at 155, 212, 280, 430, 570 and 685 cm-1. The thermoRaman spectra are in harmony with the TG and DTG patterns which show the reaction of α-gallium oxyhydroxide to β-gallium oxide occurs at 365 degrees Celsius

Topics: 030600 PHYSICAL CHEMISTRY (INCL. STRUCTURAL), 030603 Colloid and Surface Chemistry, Gallium oxide, oxyhydroxide, nanorods, nanofibre, Raman spectroscopy
Publisher: John Wiley & Sons
Year: 2008
DOI identifier: 10.1002/jrs.1981
OAI identifier: oai:eprints.qut.edu.au:14942

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