Luminescence and magnetic behaviour of almond like (Na0.5La0.5)MoO4:RE3+ (RE=Eu, Tb, Dy) nanostructures

Luminescence and magnetic properties of novel nanoparticle-sheathed 3D Micro-Architectures of Fe0.5R0.5(MoO4)1.5:Ln3+ (R = Gd3+, La3+), (Ln = Eu, Tb, Dy) for bifunctional application

“…Initially, when the EDTA was introduced into the precipitating medium, it effectively capped the ions or molecules and was preferentially adsorbed onto certain faces to form an intermediate complex. [11] The capping ability of EDTA is a key factor in the formation of self-assembled networks and can possibly control the growth of the nuclei in certain specific directions. [5,11] The chelating agent EDTA is a Lewis acid that has four carboxyl groups (-COOH) and two lone pairs of electrons on two nitrogen atoms, [19] through which the EDTA may shield the metal ions and form the intricate Fe 3+ /Gd 3+ -EDTA structures.…”

“…With an increase in reaction temperature, Fe 3+ /Gd 3+ ions can be gradually released from the intermediate complex, which controls the germination of nuclei and, the growth rate, and facilitates the formation of self-assembly. [11] Initially, tiny crystalline nuclei formed in a supersaturated solution initiate the crystallization process for subsequent growth. Here, as regards thermodynamics, during the self-assembly process tiny nanocrystals were grown continuously to form bigger particles through the Ostwald ripening process at higher reaction time intervals, due to interactions between the 0D particles, resulting in 2D nanosheets.…”

“…The formed 2D nanoparticles are constantly selfaggregated via a layer-by-layer stacking style to form quasibipyramidal bases for the subsequent growth of 3D bipyramid structures. [11] After the continuous growth and development of bipyramid particles, some of the mature particles are readily disassembled into tiny nanocrystals (size ~ 135 -170 nm) which are finally sheathed on individual bipyramid like particles. The disassembly of well-organized structures could raise the systemic entropy and thus reduce the free energy of the whole system [23] when they are aged for a longer time period.…”

“…[11][12][13][14][15] Iron molybdate is reported to be an effective catalyst [16] used in the oxidation of methanol to formaldehyde. [13] However, very few studies explain the magnetic properties of iron molybdates.…”

Synthesis of graphene oxide/rare-earth complex hybrid luminescent materials via π-π stacking and their pH-dependent luminescence

“…The greater absorption peak is related to the p / p* transition in the ligands. Ligands generate p / p* transition by absorbing the energy of the excitation light, then transfer the absorbed energy to Eu 3þ ultimately resulting in fluorescence emission near 613 nm [39,40]. As shown in Fig.…”