Abstract
Nanosized rare earth (RE) hydroxides including La(OH)3, Nd(OH)3, Pr(OH)3, Sm(OH)3, Gd(OH)3, and Er(OH)3 with rod-like morphology are fabricated via a convenient hydrothermal approach. This strategy calls for the first preparation of metal complexes between RE precursors and dodecylamine (DDA) in water/ethanol mixture at room temperature and subsequent thermal decomposition at elevated temperature. The influence of reaction time and water/ethanol volume ratios on the morphology and size of as-prepared RE hydroxides are investigated. CeO2 nanoparticles with spherical shape could be directly obtained by hydrothermal treatment of complexes formed between Ce precursors and DDA. In addition, by further calcinating the RE hydroxides at high temperature in air, RE oxide nanorods could be readily produced.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-0850-2) contains supplementary material, which is available to authorized users.
Highlights
Recent years have witnessed considerable interest in the design and preparation of rare earth (RE) nanomaterials due to their great potential applications as phosphors, magnets, catalysts, superconductors, and electrolytes [1,2,3,4,5,6,7,8]
We demonstrate a hydrothermal approach to the fabrication of RE hydroxide nanorods, labeled as RE (OH)3 (RE = La, Nd, Pr, Sm, Gd, and Er)
We found that the reaction time and water/ ethanol volume ratio have significant influence on the size and morphology of the RE hydroxides, while the effect from the hydrothermal temperature and DDA/ RE precursor ratio is only slight
Summary
Recent years have witnessed considerable interest in the design and preparation of rare earth (RE) nanomaterials due to their great potential applications as phosphors, magnets, catalysts, superconductors, and electrolytes [1,2,3,4,5,6,7,8]. Among a large number of nanosized RE candidates, the RE hydroxides, which can be modified into corresponding oxides, oxysulfides, oxyfluorides, and fluorides, have attracted much attention in recent years [10,11,12,13,14]. The preparation of the nanosized RE hydroxides is mainly based on a hydrothermal/solvothermal treatment in the presence of an inorganic base/organic base at a designed temperature. A hydrothermal system for preparing RE hydroxides consists of precursor, solvent, and organic additive. As the physicochemical properties of the solvent can influence reactivity, solubility, and
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