Single-crystal gibbsite nanorods with a high aspect ratio were synthesized by a facile hydrothermal method. Characterizations by HRTEM, SAED, and XRD revealed that the nanorods prefer to grow along the c -axis. The nanorods can be easily transformed to χ-alumina by calcination at 250 °C, while the nanorod morphology is well-maintained. HRTEM indicates that the χ-alumina nanorod possesses a single-crystal-like structure formed by orientated connection of crystalline nanodomains. Altering the synthetic procedure will lead to alumina nanostructures with a different phase structure and morphology, such as alumina nanotubes.
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Liu et al. (2008) studied this question.
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