Issue 26, 2011
From the journal:

Dalton Transactions

Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method

Hee-Suk Roh,a   Geun Kyu Choi,b   Jae-Sul An,c   Chin Moo Cho,a   Dong Hoe Kim,a   Ik Jae Park,a   Tae Hoon Noh,a   Dong-Wan Kim*d  and  Kug Sun Hong*a  

* Corresponding authors

a Department of Materials Science & Engineering, Seoul National University, Shillim-dong, San 56-1, Gwanak-gu, Seoul, Korea
E-mail: kshongss@plaza.snu.ac.kr
Fax: +82-2-886-4156
Tel: +82-2-880-8024

b Semiconductor R&D Center, Samsung Electronics Co., Maetan 3-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea

c LCD Division, Samsung Electronics Co., Maetan 3-dong, Yeongtong-gu, Suwon, Korea

d Department of Materials Science & Engineering, Ajou University, Woncheon-dong, San 5, Yeongtong-gu, Suwon, Korea
E-mail: dwkim@ajou.ac.kr
Fax: +82-31-219-1612
Tel: +82-31-219-2468

Abstract

We demonstrated the formation of monodispersed spherical aluminum hydrous oxide precursors with tunable sizes by controlling the variables of a forced hydrolysis method. The particle sizes of aluminum hydrous oxide precursors were strongly dependent on the molar ratio of the Al3+ reactants (sulfates and nitrates). In addition, the systematic phase and morphological evolutions from aluminum hydrous oxide to γ-alumina (Al2O3) and finally to α-Al2O3 through thermal dehydrogenation were characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). After annealing the amorphous aluminum hydrous oxide in air at 900°C and 1100 °C for 1 h, we observed complete conversion to phase-pure γ- and α-Al2O3, respectively, while maintaining monodispersity (125 nm, 195 nm, 320 nm, and 430 nm diameters were observed). Furthermore, both γ- and α-Al2O3 were found to be mesoporous in structure, providing enhanced specific surface areas of 102 and 76 m2 g−1, respectively, based on the Brunauer–Emmett–Teller (BET) measurement.

Graphical abstract: Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method

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Article information

DOI
https://doi.org/10.1039/C1DT10418G
Article type
Paper
Submitted
14 Mar 2011
Accepted
25 Apr 2011
First published
07 Jun 2011

Dalton Trans., 2011,40, 6901-6905

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Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method

H. Roh, G. Kyu Choi, J. An, C. Moo Cho, D. Hoe Kim, I. Jae Park, T. Hoon Noh, D. Kim and K. Sun Hong, Dalton Trans., 2011, 40, 6901 DOI: 10.1039/C1DT10418G

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