Effect of citric acid on material properties of ZnGa2O4:Cr3+ nanopowder prepared by sol–gel method

Hussen, Megersa K.; Dejene, F.B.; Gonfa, Girma Goro

doi:10.1007/s00339-018-1796-x

Cited by 29 publications

(14 citation statements)

References 30 publications

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“…There are several methods for the preparation of ZnGa 2 O 4 thin films, including: sol-gel [12], pulsed laser deposition [13], metalorganic chemical vapor deposition (MOCVD) [14], and radio…”

Section: Introductionmentioning

confidence: 99%

Influence of Annealing Temperature on the Properties of ZnGa2O4 Thin Films by Magnetron Sputtering

et al. 2019

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Zinc gallate (ZnGa2O4) thin films were grown on sapphire (0001) substrate using radio frequency (RF) magnetron sputtering. After the thin film deposition process, the grown ZnGa2O4 was annealed at a temperature ranging from 500 to 900 °C at atmospheric conditions. The average crystallite size of the grown ZnGa2O4 thin films increased from 11.94 to 27.05 nm as the annealing temperature rose from 500 to 900 °C. Excess Ga released from ZnGa2O4 during thermal annealing treatment resulted in the appearance of a Ga2O3 phase. High-resolution transmission electron microscope image analysis revealed that the preferential crystallographic orientation of the well-arranged, quasi-single-crystalline ZnGa2O4 (111) plane lattice fringes were formed after the thermal annealing process. The effect of crystallite sizes and lattice strain on the width of the X-ray diffraction peak of the annealed ZnGa2O4 thin films were investigated using Williamson-Hall analysis. The results indicate that the crystalline quality of the deposited ZnGa2O4 thin film improved at higher annealing temperatures.

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Section: Introductionmentioning

confidence: 99%

Influence of Annealing Temperature on the Properties of ZnGa2O4 Thin Films by Magnetron Sputtering

et al. 2019

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“…The reactor includes a four‐blade paddle, a heating jacket, a cooling water circulation system, and a temperature control system. [ 30 ] The operation of the ethylene polymerization experiment was as follows: the reactor was heated to 100 °C and evacuated for 30 min, and then N 2 was pumped five times to remove a small amount of water and oxygen in the reaction vessel, and then replaced with ethylene for five times. After the reactor was cooled to the reaction temperature, 60 mL of 1‐heptane and a certain amount of cocatalyst (TiBA) were added through a catalyst injection system bypassed in the reactor, and finally a 60 mL 1‐heptane rinse bypass was introduced.…”

Section: Methodsmentioning

confidence: 99%

“…Kaliva et al [ 29 ] investigated the reaction of V 2 O 5 with citrate to produce a blue solution and separated a new vanadium citrate complex as a potassium salt. Hussen et al [ 30 ] also used citric acid as a chelating agent to prepare Cr 3+ (1.0 mol%) doped ZnGa 2 O 4 nanomaterials by sol–gel method. When the molar ratio of metal to citric acid was 1:1, the material had the highest photoluminescence.…”

Section: Introductionmentioning

confidence: 99%

CrV Bimetallic Phillips Catalyst Prepared by Citric Acid‐Assisted Impregnation on Ethylene Polymerization

Liu

Zhang²,

He³

et al. 2020

Macro Chemistry & Physics

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/macp.202000010. Three CrV bimetallic Phillips catalysts are developed by a citric acid-assisted impregnation method and studied in ethylene homopolymerization and ethylene/1-hexene copolymerization. The method benefits to the dispersion of bimetallic active sites, especially for the V ones. The electron binding energy shift of V 2p 3/2 in CrV-1/2-CA suggests the increased electron deficiency of V active center. The CrV-1/2-CA, CrV-1/3-CA catalysts present higher activity, broader molecular weight distribution, than the counterparts without CAassisted impregnation, suggesting more active sites involved in the reaction. The 1-hexene is higher inserted in the polyethylene by CrV-1/2 than the CrV-1/2-CA. But the results of temperature rising elution fractionation-successive selfnucleation and annealing (TREF-SSA) show the thinner platelet thickness at the high molecular weight parts of high-density polyethylene by CrV-1/2-CA, suggesting the higher insertion of 1-hexene and higher tensile properties. The CrV-1/2-CA also shows the more hydrogen-regulated response in the polymerization. The deconvolution of the gel permeation chromatography curves presents the higher fractions of high molecular weight polymer component.

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“…11,12 As a good luminescent material matrix, it shows various emission colors when doped with different transition metal ions or rare earth ions, such as Cr 3+ , Mn 2+ , Eu 3+ or Ce 3+ . 2,3,[13][14][15] The near-infrared luminescence of Cr 3+ was reported as early as 1988, but the Cr 3+ doped with ZnGa 2 O 4 near-infrared luminescent material was rarely reported. The rst report on near infrared-persistent luminescence in Cr 3+ doped ZnGa 2 O 4 by Bessière et al in 2011.…”

Section: Introductionmentioning

confidence: 99%

“…The sol-gel method gives an excellent control over the stoichiometry, introducing dopant easily and allowing lower processing temperature compared to other methods. 13 The citrate sol-gel technique is the most common. But its only can obtained nanopowders instead of monolith.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a ZnGa₂O₄:Cr³⁺-based aerogel

Zhang

Chen

et al. 2019

RSC Adv.

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Effect of citric acid on material properties of ZnGa2O4:Cr3+ nanopowder prepared by sol–gel method

Cited by 29 publications

References 30 publications

Influence of Annealing Temperature on the Properties of ZnGa2O4 Thin Films by Magnetron Sputtering

Influence of Annealing Temperature on the Properties of ZnGa2O4 Thin Films by Magnetron Sputtering

CrV Bimetallic Phillips Catalyst Prepared by Citric Acid‐Assisted Impregnation on Ethylene Polymerization

Synthesis and characterization of a ZnGa₂O₄:Cr³⁺-based aerogel

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Effect of citric acid on material properties of ZnGa2O4:Cr3+ nanopowder prepared by sol–gel method

Cited by 29 publications

References 30 publications

Influence of Annealing Temperature on the Properties of ZnGa2O4 Thin Films by Magnetron Sputtering

Influence of Annealing Temperature on the Properties of ZnGa2O4 Thin Films by Magnetron Sputtering

CrV Bimetallic Phillips Catalyst Prepared by Citric Acid‐Assisted Impregnation on Ethylene Polymerization

Synthesis and characterization of a ZnGa2O4:Cr3+-based aerogel

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Synthesis and characterization of a ZnGa₂O₄:Cr³⁺-based aerogel