Nanocrystallites obtained through the pyrosol method

Dinu, Elena; Andronescu, Ecaterina; Ghiţulică, Cristina; Siebert, Elisabeth; Djurado, Elisabeth; Dessemond, Laurent

doi:10.1002/pssa.200778150

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Different synthesis methods, such as solid-state reaction [18], coprecipitation [19][20][21], sol-gel [22][23][24], hydrothermal [25][26][27], pyrosol [28,29], microemulsion [30][31][32], combustion [13], and electrochemical methods [33,34] have been used in order to obtain the europium-doped zinc oxide nanoparticles. The precipitation/coprecipitation method, as compared to other chemical or physical methods, is an inexpensive method which allows the synthesis of a wide range of nanoparticles with different and controlled sizes and shapes [19,20,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

et al. 2015

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The paper presents a simple, reproducible, controllable, and direct wet chemical synthesis method for Zn 1-x Eu x O nanoparticles. The full understanding of decomposition mechanism of the as-obtained oxalate precipitate was achieved based on the thermal analysis correlated with the evolved gas analysis and FTIR spectroscopy. The structure, morphology, and optical luminescent properties of the Zn 1-x Eu x O nanoparticles have been investigated by X-ray diffraction, Raman spectroscopy, HRTEM, SAED, XPS, and PL. The XRD studies reveal the formation of a hexagonal wurtzite-type structure. The presence of Eu 2 O 3 cubic structure can be observed up to 0.5 mol% Eu, suggesting that the solubility of the divalent or trivalent Eu into the ZnO lattice is limited. The formation of Eu 2 O 3 secondary phase at higher Eu concentration is sustained by Raman spectroscopy and XPS, as well. The TEM investigations of the Eu-doped ZnO samples illustrate the presence of aggregates with different shapes and dimensions formed by agglomerated spherical and polyhedral nanoparticles with sizes ranging from 20 to 120 nm. The effect of europium concentration on the structural and morphological characteristics, as well as on the luminescent properties was studied with special emphasis on the europium chemical states-Eu 2? and Eu 3? . The PL measurements sustain the presence of both divalent and trivalent europium ions into the ZnO host lattice and, at the same time, an increase of its defects density induced by the dopant presence.

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Section: Introductionmentioning

confidence: 99%

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

et al. 2015

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“…During the passage of the aerosol through the furnace, some reactions occur such as evaporation, calcination, and densification of powder. At the end of the tube, a high‐voltage Mo wire collects the powder 12.…”

Section: Methodsmentioning

confidence: 99%

Yttria totally stabilized zirconia nanoparticles obtained through the pyrosol method

Vasile

Ghiţulică

et al. 2010

Physica Status Solidi (a)

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In this work, 10 mol% yttria-stabilized cubic zirconia is obtained through the pyrosol method, starting from diluted solutions of zirconyl (IV) nitrate hydrate (ZrO(NO 3 ) 2 Á6H 2 O) and yttrium (III) nitrate hexahydrate (Y(NO 3 ) 3 Á6H 2 O) in water. The main factors that are influencing the parameters of prepared powders are the concentration of starting solutions, soluble salts type, synthesis temperature, vibration frequency of the piezoelectric ceramics, etc. In the present paper, we investigated the influence of the concentration of starting solutions and of the thermal treatment temperature on the dimensions, morphology, and composition of powders. The methods of analysis used to characterize the obtained powders were X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy, and transmission electron microscopy/high-resolution transmission electron microscopy (TEM/HRTEM). The only crystallographic phase identified through XRD, for powders prepared at 800 8C and higher and for all concentrations, is cubic zirconia. From SEM images it was observed that there were obtained spherical particles with a medium size of approximately 85 nm. From TEM/HRTEM images it can be seen that the spherical particles are polycrystalline with nanocrystalites reaching a mean dimension of 4 nm.

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“…In previous works, the preparation of various calcium phosphates, for example, HAp [7,9,10], TCP [11,12], calcium diphosphate [12], calcium metaphosphate [13], trace elements substituted calcium phosphates such as strontiumsubstituted HAp [14], silicon-substituted HAp [15], and silvercontaining HAp [16] by the USSP technique was reported. The effects of the kinds of the starting materials on properties of HAp powders prepared by the USSP technique were also examined [10].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Spherical Zn-Substituted Tricalcium Phosphate Powder by Ultrasonic Spray-Pyrolysis Technique and Its Characterization

Nishikawa¹,

Honda

Yokota³

et al. 2016

Journal of Nanomaterials

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Zinc, an essential trace element, has a stimulatory effect on bone formation. To enhance the osteoconduction of implant materials such as hydroxyapatite and tricalcium phosphate (TCP), zinc was incorporated into them. In this study, we have synthesized spherical zinc-substituted TCP (Zn-TCP) powders using ultrasonic spray-pyrolysis technique, fabricated Zn-TCP ceramics, and characterized their powder properties. Four kinds of Zn-TCPs with various amounts of zinc content were prepared, to examine the influence of zinc addition to the crystal structure of TCP and to compare the different Zn-TCPs with each other. Zn-TCP ceramics were fabricated from the resulting powders under different sintering temperatures. Zn-TCP samples were analyzed and led to the following results: the resulting powders were composed of -and -TCP phases, whereas the fabricated ceramics mainly consisted of -TCP phase. The determination of zinc content in the resulting powders and fabricated ceramics showed a maximum content of ∼12 mol%. The resulting powders consisted of spherical particles with diameters <2 m. The lattice constants of ceramics did not show a significant change of the -axis, -axis, and -axis. The bulk density of Zn-TCPs showed their maximum at 1100 ∘ C, while the bulk density of Zn-TCP(0) was greatest at 1000 ∘ C.

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Nanocrystallites obtained through the pyrosol method

Cited by 9 publications

References 6 publications

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

A valence states approach for luminescence enhancement by low dopant concentration in Eu-doped ZnO nanoparticles

Yttria totally stabilized zirconia nanoparticles obtained through the pyrosol method

Preparation of Spherical Zn-Substituted Tricalcium Phosphate Powder by Ultrasonic Spray-Pyrolysis Technique and Its Characterization

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