Morphology-Controlled Nonaqueous Synthesis of Anisotropic Lanthanum Hydroxide 
Nanoparticles

Djerdj, Igor; Garnweitner, Georg; Su, Dang Sheng; Niederberger, Markus

doi:10.1016/j.jssc.2007.05.019

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Morphology-Controlled Nonaqueous Synthesis of Anisotropic Lanthanum Hydroxide Nanoparticles

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Su, Dang Sheng
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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引用

Djerdj, I., Garnweitner, G., Su, D. S., & Niederberger, M. (2007). Morphology-Controlled Nonaqueous Synthesis of Anisotropic Lanthanum Hydroxide Nanoparticles. Journal of Solid State Chemistry, 180(7), 2154-2165. doi:10.1016/j.jssc.2007.05.019.

引用: https://hdl.handle.net/11858/00-001M-0000-0011-0243-1

要旨

The preparation of lanthanum hydroxide and manganese oxide nanoparticles is presented, based on a nonaqueous sol–gel process involving the reaction of La(OiPr)₃ and KMnO₄ with organic solvents such as benzyl alcohol, 2-butanone and a 1:1 vol. mixture thereof. The lanthanum manganese oxide system is highly complex and surprising results with respect to product composition and morphology were obtained. In dependence of the reaction parameters, the La(OH)₃ nanoparticles undergo a shape transformation from short nanorods with an average aspect ratio of 2.1 to micron-sized nanofibers (average aspect ratio is more than 59.5). Although not directly involved, KMnO₄ plays a crucial role in determining the particle morphology of La(OH)₃. The reason lies in the fact that KMnO₄ is able to oxidize the benzyl alcohol to benzoic acid, which presumably induces the anisotropic particle growth in [001] direction upon preferential coordination to the ±(100), ±(010) and ±(−110) crystal facets. By adjusting the molar La(OiPr)₃-to-KMnO₄ ratio as well as by using the appropriate solvent mixture it is possible to tailor the morphology, phase purity and microstructure of the La(OH)₃ nanoparticles. Postsynthetic thermal treatment of the sample containing La(OH)₃ nanofibers and β-MnOOH nanoparticles at the temperature of 800°C for 8 h yielded polyhedral LaMnO₃ and worm-like La₂O₃ nanoparticles as final products.