Synthesis and characterization of monodisperse Eu^3＋ doped gadolinium oxysulfide nanocrystals  

作　　者：J. Cichos M. Karbowiak D. Hreniak W. Strek 

机构地区：[1]Faculty of Chemistry University of Wroclaw, F. Joliot-Curie 14, Wroclaw, 50-383, Poland [2]Institute for Low Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-383, Poland

出　　处：《Journal of Rare Earths》2016年第8期850-856,共7页稀土学报（英文版）

基　　金：Project supported by Wroclaw Research Centre EIT+within the project"The Application of Nanotechnology in Advanced Materials”-Nano Mat(POIG.01.01.02-02-002/08) co-financed by the European Regional Development Fund(Operational Programme Innovative Economy,1.1.2)

摘　　要：Gd202S：Eu3＋ nanoparticles were synthesized using two step process consisting of sulfuration of basic carbonates obtained by homogenous precipitation. Annealing of lanthanide nitrates at total concentration of 5x 10^-3 mol/L in a water solution containing relatively high, three molar concentration of urea ensured the optimal conditions for the reproducible preparation of uniform and small spherical particles. During sulfuration step elemental sulfur was mixed with precursor which eliminated necessity of using an auxiliary furnace and provided sulfur-reach reaction atmosphere. Such optimized protocol afforded synthesis of spherical and non-agglomerated nanoparticles with diameter smaller than 100 nm. The precursors morphology was maintained, but particles size was reduced by 15%-20% during sulfuration. The results indicated that higher emission intensity was observed for Gd202S：Eu3＋（8%） oxysulfide sample synthesized using crystalline Gd（CO3）OH precursor, than for that obtained from amorphous Gd2（OH）2（CO3）2.H20 precursor, although some further efforts to improve morphology of the former are still required.Gd202S：Eu3＋ nanoparticles were synthesized using two step process consisting of sulfuration of basic carbonates obtained by homogenous precipitation. Annealing of lanthanide nitrates at total concentration of 5x 10^-3 mol/L in a water solution containing relatively high, three molar concentration of urea ensured the optimal conditions for the reproducible preparation of uniform and small spherical particles. During sulfuration step elemental sulfur was mixed with precursor which eliminated necessity of using an auxiliary furnace and provided sulfur-reach reaction atmosphere. Such optimized protocol afforded synthesis of spherical and non-agglomerated nanoparticles with diameter smaller than 100 nm. The precursors morphology was maintained, but particles size was reduced by 15%-20% during sulfuration. The results indicated that higher emission intensity was observed for Gd202S：Eu3＋（8%） oxysulfide sample synthesized using crystalline Gd（CO3）OH precursor, than for that obtained from amorphous Gd2（OH）2（CO3）2.H20 precursor, although some further efforts to improve morphology of the former are still required.

关 键 词：oxysulfides NANOCRYSTALS hydroxycarbonates rare earths 

分 类 号：O614.339[理学—无机化学]