Hydrothermal Synthesis of Various Shape-Controlled Europium Hydroxides

Zheng, Hongjuan; Zhu, Kongjun; Onda, Ayumu; Yanagisawa, Kazumichi

doi:10.3390/nano11020529

Cited by 13 publications

(3 citation statements)

References 31 publications

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“…One other notable characteristic of disordered structures is that they may also alter the crystal nucleation and growth processes [1,2,11]. Hence, from this perspective, the control of these crystal features is achieved by suppressing the growth of the crystal face by selectively adsorbing an additive to a specific face [255,[270][271][272][273][274][275]. In addition, the suppression of the aggregation of nuclei can also be controlled by adding a dispersant/thickener or by controlling the pH of the solution.…”

Section: Nucleation and Growth Stagesmentioning

confidence: 99%

An overview into advantages and applications of conventional and unconventional hydro(solvo)thermal approaches for novel advanced materials design

Conti

Dey

Pottker

et al. 2022

Preprint

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The hydro(solvo)thermal approaches due to their simplicity and relatively low cost have attracted great attention to novel advanced materials processing with controlled particle sizes and well-defined morphologies, including the desirable obtaining of diverse metastable phases. Furthermore, in this case, such advanced materials obtained by this strategy generally have a high crystallinity structure as the main characteristic, which is interesting for a wide range of technological applications of high performance. This critical review presents the recent progress and challenges in conventional and unconventional hydro(solvo)thermal synthesis of novel advanced materials with desirable functionality and outstanding physicochemical properties designed using such methods. Finally, in this perspective, we believe that this detailed knowledge of the effect of processing parameters and as they will affect the prepared materials structure-composition-morphology is a key step to providing new chemical insights for the rational advanced materials design.

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Section: Nucleation and Growth Stagesmentioning

confidence: 99%

An overview into advantages and applications of conventional and unconventional hydro(solvo)thermal approaches for novel advanced materials design

Conti

Dey

Pottker

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Perovskites, garnets, spinels and lately also oxyhydroxides doped with rare-earth (RE) elements have been drawing large attention due to their optical properties, by which these compounds can be widely used in medicine and industry, e.g. as scintillators, luminophores and photovoltaic materials [1][2][3][4][5]. One of the many beneficial features of these materials is that they are very efficient in absorbing light and use less material to capture the same amount of energy when compared to conventional solar absorbers.…”

Section: Introductionmentioning

confidence: 99%

Optical and structural properties of europium doped Y–Al–O compounds grown by microwave driven hydrothermal technique

Cichocka¹,

Kobyakov²,

Kaszewski³

et al. 2021

Nanotechnology

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Perovskites, garnets, monoclinic forms, and lately also oxyhydroxides doped with rare-earth ions have been drawn large attention due to their beneficial optical and photovoltaic properties. In this work, we have shown that several forms of crystals from Y–Al–O family can be synthesized using microwave driven hydrothermal technique using different pH and post-growth annealing at different temperatures. The structural and optical properties of these crystals were investigated as a function of hydrothermal crystallization conditions. For this purpose, x-ray diffraction, scanning electron microscopy, energy-dispersive x-ray spectroscopy, transmission electron microscopy, photoluminescence, and photoluminescence excitation studies were performed. All the structures have been doped with Eu3+ ions which are known as a local symmetry sensor because various symmetries generate different crystal fields and thus affect their luminescence spectra. The optical properties of the obtained nanoparticles in correlation with their structure and chemical composition are discussed.

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“…Fundamental studies based on parametric optimisation analyses correlating hydrothermal media selection, solvent pH, the chemical stability of the target crystalline phase, and precursor reactivity, among other things, are essential to determine the feasible morphological tuning of NPs to be prepared under hydrothermal conditions. Zheng et al [6] applied this methodology for synthesising Eu(OH) 3 submicron particles and nanoparticles. Eu(OH) 3 was chemically stable in the pH range of 7.26-12; in acidic conditions, the dominating phase was Eu 2 (OH) 5 NO 3 •2H 2 O in the Eu 2 O 3 -NO 3 -NH 4 OH-H 2 O system.…”

mentioning

confidence: 99%