Gallium doped boehmite nanotubes and nanoribbons-a TEM, EDX, XRD, BET and TG study
Frost, Ray L., Zhao, Yanyan, & Martens, Wayde N. (2007) Gallium doped boehmite nanotubes and nanoribbons-a TEM, EDX, XRD, BET and TG study. Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 111(14), pp. 5313-5324.
Gallium doped boehmite nanostructures with varying gallium content have been prepared at low temperatures via a soft-chemistry route in the presence of poly (ethylene oxide) (PEO) surfactant. The effect of gallium content, hydrothermal temperature and mixing procedures on the growth of boehmite nanostructures was systematically studied. The resultant boehmite nanostructures were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD), N2 adsorption and thermogravimetric analysis (TGA). Nanotubes with average length of ~90 nm, internal and external diameters of 2~5 nm and 3~7 nm respectively were formed when added gallium molar percentage ≤5 %; when added gallium percentage>10%, an amorphous phase dominated the sample with a mixture of nanosheets, nanotubes and nanoribbons was also formed. Synthesis at slightly higher temperatures (120 °C) for added gallium molar percentage ≤5 % resulted in longer nanotubes. For high gallium content boehmites large crystals are formed when hydrothermally treated at 120 °C. The detailed characterization of the resultant gallium doped boehmite nanostructures is presented.
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