| 简介 |
FIELD : chemistry.
SUBSTANCE : solution of rare-earth salts is prepared, for example, nitrates of gadolinium, europium, terbium and ytterbium, in non-polar solvents - oleyl amine, oleic acid or compositions thereof with concentration of rare-earth elements of 0.05-0.1 mol/l. The solution is heated in an inert atmosphere of argon to 80-100°C and held at that temperature for 15-30 minutes. Diphenyl ether is then added in amount of 5-10 moles of ether per mole of rare-earth elements. The mixture is heated to 250-300°C and held for 1-2 hours. Excess polar solvent - acetone - is added to the obtained mixture. The coagulated nanoparticles are separated from the solution by centrifuging and the residue is redispersed in excess heptane. Colloidal solutions of luminescent nanoplates of rare-earth oxides with average diameter of 8-17 nm and thickness of 1-15 nm are obtained.
EFFECT : invention enables to obtain luminescent nanoplates of high morphological homogeneity, which ensures stability of their photo- and cathodoluminescent characteristics.
4 cl, 2 dwg, 4 ex |
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