Abstract
Hexagonal LaF3 nanoplates have been successfully prepared via a polyol-mediated route with ethylene glycol (EG) as solvent. NaNO3, which was introduced into the reaction system as a mineralizer, played an important role in the formation process of these nanoplates. The size of the as-prepared nanoplates could be tuned by changing the NaNO3 content and the NH4F content. A possible formation mechanism of these nanoplates has been proposed. The effects of other alkali metal nitrates (LiNO3, KNO3, RbNO3 and CsNO3) and solvents (water, methanol, diethylene glycol, and glycerol) on the products have also been explored. The increased chemical potential caused by the addition of NaNO3 in the reaction system made LaF3 nanoplates formed initially unstable and transform into stable regular hexagonal LaF3 nanoplates with a bigger size by a slow dissolution−recrystallization process.
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