An Ionic Liquid-assisted Hydrothermal Synthesis of CeO2 Nanorods

doi:10.15541/jim20140520

Abstract

Abstract:

CeO₂ nanorods were synthesized by a hydrothermal method at 160℃ from CeCl₆·6H₂O and NH₃·H₂O in the presence of an ionic liquid 1-butyl-3-methyl-imidazolium chloride ([Bmim]Cl). The phase and morphology of the resulting products were characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM), respectively. The results reveal that morphology of CeO₂ prepared in the presence of the ionic liquid is nanorod while it changes to irregular nanoparticle without ionic liquid. The resulting nanorods are about 13-25 nm in diameter and 200-500 nm in length. With the increase of ionic concentration, nanorods were disappeared gradually and nanoparticles were obtained. Moreover, increasing the hydrothermal temperature to 180℃, nanospheres at size of 19-24 nm could be synthesized by aggregation of ~2 nm nanocrystals.

Key words: cerium oxide, soft template, hydrothermal treatment, ionic liquid, nanorod

CLC Number:

TQ174

CHEN Ting, JIANG Wei-Hui, ZHANG Xiao-Jun, XIE Zhi-Xiang, LIU Jian-Min, JIANG Wan. An Ionic Liquid-assisted Hydrothermal Synthesis of CeO₂ Nanorods[J]. Journal of Inorganic Materials, 2015, 30(3): 325-329.

Figures/Tables 5

Fig. 1 XRD patterns of the as-synthesized CeO2 in ionic liquid [Bmim]Cl (a), and in absence of [Bmim]Cl (b)

Fig. 2 FT-IR (a), EDS (b) and XPS (c) spectra of the as-synthesized CeO2 nanorods

Fig. 3 Typical SEM (a), TEM (b), HRTEM (c) images of the as-synthesized CeO2 in IL at 160℃ with molar ratio nIL/nCe=1, and TEM image in absence of IL (d)

Fig. 4 TEM images of as-synthesized CeO2 with the molar ratio nIL/nCe=2 at 160℃ (a), nIL/nCe=5 at 160℃ (b), nIL/nCe=2 at 180℃ (c), and the mixed solution before hydrothermal treatment (d)

Fig. 5 Schematic illustration of the formation mechanism of CeO2 with various morphologies via IL combined hydrothermal method

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An Ionic Liquid-assisted Hydrothermal Synthesis of CeO₂ Nanorods

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