Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (07): 1391-1396.doi: 10.3866/PKU.WHXB20090729

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Synthesis, Characterization and Growth Mechanism of Core/Shell AlOOH Microspheres

LV Yong, LU Wen-Cong, ZHANG Liang-Miao, YUE Bao-Hua, SHANG Xing-Fu, NI Ji-Peng   

  1. Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, P. R. China
  • Received:2008-12-09 Revised:2009-04-09 Published:2009-06-26
  • Contact: LU Wen-Cong E-mail:wclu@shu.edu.cn

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Abstract:

An experimental procedure is presented for the synthesis of crouching hedgehog-like and core/shell AlOOH microspheres by a one-step hydrothermal process in an aqueous solution of trisodium citrate at 200 ℃. The structure, morphology, purity and size of the products were characterized by several techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), nitrogen adsorption/desorption measurement and photoluminescent (PL) analysis. The reaction time and concentrations of trisodium citrate influenced the final structures and shapes of the AlOOHmicrospheres. Brunauer-Emmett-Teller (BET) analyses revealed high values (171.5 and 178.6 m2·g-1) of the specific surface areas for the crouching hedgehog-like and core/shell AlOOH microspheres. A possible formation mechanism of core/shell AlOOH microspheres is proposed and discussed based on the reaction dynamics process and the assisted growth process. The photoluminescent spectra of these nanostructures showed different emission bands and this difference might be because of their distinct sizes and morphologies.

Key words: Hydrothermal method, Core/shell, AlOOH, Photoluminescence, Ostwald ripening, Growth mechanism