Complex formation in the course of synthesis of zinc oxide from citrate solutions

Farbun, I. A.; Romanova, I. V.; Terikovskaya, T. E.; Dzanashvili, D. I.; Kirillov, S. А.

doi:10.1134/s1070427207110031

Cited by 21 publications

(11 citation statements)

References 12 publications

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“…Table 2 summarizes the data of TA and MS analysis for all precursors and Ce/CNT samples. Taking into account the literature data and research results [42][43][44][45][46][47][48][49], we can conclude that in comparison with bulk salts for supported salts the temperature region of the salt decomposition shifts to the low-temperature region. The decomposition of metal precursors supported on CNTs was started and completed at temperatures of lower by 15-50 and 25-50 °C, respectively, compared with the bulk active metal precursor.…”

Section: Ce/cntsmentioning

confidence: 65%

Preparation of Carbon Nanotubes with Supported Metal Oxide Nanoparticles: Effect of Metal Precursor on Thermal Decomposition Behavior of the Materials

Матус¹,

Khitsova²,

Ефимова³

et al. 2019

Eurasian Chem. Tech. J.

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To develop new catalysts based on carbon nanomaterials with supported metal oxide nanoparticles for oxidative transformations of sulfur compounds, a series of metal oxide nanoparticle-decorated carbon nanotubes (MOx/CNTs) were prepared by incipient wetness impregnation at a variation of the active metal type (M = Ce, Mo, Cu). The thermal decomposition of bulk and CNT supported metal precursors used in the preparation of MOx/CNTs was analyzed under inert atmosphere employing several thermoanalytical techniques (thermogravimetry, differential thermogravimetry and differential scanning calorimetry) coupled with mass spectrometry. The thermolysis parameters of the bulk and supported metal precursors were compared and the effect of CNT support on the decomposition pattern of compounds was elucidated. It was established that the decomposition of metal precursors supported on CNTs was started and completed at temperatures of 15‒25 and 25‒70 °C lower, respectively, compared with the bulk active metal precursor. The enhancement of CNT support stability against thermal degradation is observed in the following row of metal cations: Ce < Cu < Мо < pristine and metal anions of precursor: nitrate < chloride < sulfate. The optimal mode of thermal treatment of catalyst and appropriate active metal precursors were selected for advanced synthesis of nanosized MOx/CNT catalyst.

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Section: Ce/cntsmentioning

confidence: 65%

Preparation of Carbon Nanotubes with Supported Metal Oxide Nanoparticles: Effect of Metal Precursor on Thermal Decomposition Behavior of the Materials

Матус¹,

Khitsova²,

Ефимова³

et al. 2019

Eurasian Chem. Tech. J.

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“…[29][30][31], citrate precursors after drying at 120°C (dried resins) consist of stoichiometric hydrous citrates and upon pyrolysis, decompose giving the target products. In the case of lithium manganese spinels, the precursors contain the mixture of dihydrates of lithium citrate, manganese-II citrate, and two excess moles of citric acid, and their decomposition in air is described by the following reaction [28],…”

Section: Resultsmentioning

confidence: 99%

“…Citrate precursors have been obtained in the following way [27][28][29][30][31]. Solutions of lithium nitrate, manganese-II nitrate, and citric acid (all of analytical grade) of approx.…”

Section: Methodsmentioning

confidence: 99%

A new method of pretreatment of lithium manganese spinels and high-rate electrochemical performance of Li[Li0.033Mn1.967]O4

Potapenko

Chernukhin

Kirillov

2014

Mater Renew Sustain Energy

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Lithium manganese spinels tend to aggregate upon annealing and do not allow for attaining high discharge rates when used as cathodes in lithium-ion batteries. To obtain spinel samples of lower aggregation and better highrate properties, precursors synthesized by means of a citric acid-aided route are suggested to be pyrolyzed in an inert atmosphere, instead of pyrolysis in air. The synthesis of nanosized Li[Li 0.033 Mn 1.967 ]O 4 is described, and its characteristics including X-ray diffraction, scanning electron microscopy, and porosity, as well as electrochemical test results are presented. The particle size of the materials obtained is smaller, the degree of aggregation is lower, and high-rate properties are better than for analogues pyrolyzed in air. In particular, sample Li||Li[Li 0.033 Mn 1.967 ]O 4 cells deliver *60 mAh g -1 at the current loads of 4,000 mA g -1

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“…1(a) and 1(b). The data showed the major characteristic Zn-O vibrations 5 6,7 Additionally, weaker bands consistent with s(CH 2 ) and (C-OH) at 907 and 1067 cm À1 are also observed. [6][7][8] ZnO-II also showed many of these bands due to surface adsorbed groups resulting from the acetate groups, but with somewhat lower intensity and at slightly different frequencies, presumably due to the absence of a surfactant like DEG in this sample.…”

mentioning

confidence: 75%

Defect induced ferromagnetism in undoped ZnO nanoparticles

Rainey

Chess

Eixenberger

et al. 2014

Journal of Applied Physics

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Undoped ZnO nanoparticles (NPs) with size ∼12 nm were produced using forced hydrolysis methods using diethylene glycol (DEG) [called ZnO-I] or denatured ethanol [called ZnO-II] as the reaction solvent; both using Zn acetate dehydrate as precursor. Both samples showed weak ferromagnetic behavior at 300 K with saturation magnetization Ms = 0.077 ± 0.002 memu/g and 0.088 ± 0.013 memu/g for ZnO-I and ZnO-II samples, respectively. Fourier transform infrared (FTIR) spectra showed that ZnO-I nanocrystals had DEG fragments linked to their surface. Photoluminescence (PL) data showed a broad emission near 500 nm for ZnO-II which is absent in the ZnO-I samples, presumably due to the blocking of surface traps by the capping molecules. Intentional oxygen vacancies created in the ZnO-I NPs by annealing at 450 °C in flowing Ar gas gradually increased Ms up to 90 min and x-ray photoelectron spectra (XPS) suggested that oxygen vacancies may have a key role in the observed changes in Ms. Finally, PL spectra of ZnO showed the appearance of a blue/violet emission, attributed to Zn interstitials, whose intensity changes with annealing time, similar to the trend seen for Ms. The observed variation in the magnetization of ZnO NP with increasing Ar annealing time seems to depend on the changes in the number of Zn interstitials and oxygen vacancies.

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Complex formation in the course of synthesis of zinc oxide from citrate solutions

Cited by 21 publications

References 12 publications

Preparation of Carbon Nanotubes with Supported Metal Oxide Nanoparticles: Effect of Metal Precursor on Thermal Decomposition Behavior of the Materials

Preparation of Carbon Nanotubes with Supported Metal Oxide Nanoparticles: Effect of Metal Precursor on Thermal Decomposition Behavior of the Materials

A new method of pretreatment of lithium manganese spinels and high-rate electrochemical performance of Li[Li0.033Mn1.967]O4

Defect induced ferromagnetism in undoped ZnO nanoparticles

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