Surfactant-free synthesis of octahedral ZnO/ZnFe2O4 heterostructure with ultrahigh and selective adsorption capacity of malachite green

Liu, Jue; Zeng, Min; Yu, Ronghai

doi:10.1038/srep25074

Cited by 50 publications

(30 citation statements)

References 49 publications

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“…The performed deconvolution of Fe2p lines confirms the inverse spinel structure. Such behavior was already observed in photoemission studies for other nanoparticles [71,82]. It is in agreement with XRD refinement, where iron 3+ ion was evidenced in two sites: Boctahedral and Atetrahedral.…”

Section: Xps Measurementssupporting

confidence: 89%

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Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Bajorek

Berger

Dulski

et al. 2019

Journal of Physics and Chemistry of Solids

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The comprehensive study of the Ni0.5Zn0.5Fe2O4 ferrite nanopowder crystallized in the inverse spinel structure and synthesized by co-precipitation method is presented. The distribution of Fe 3+ cations among tetrahedral and octahedral sites was confirmed. The microstructural investigations revealed the presence of ultrafine grained structure with an average crystallites size in the range of 14 ÷ 20 nm. Raman and Fourier-Transform Infrared (FTIR) spectroscopy studies confirmed typical spinel structure with tetrahedrally and octahedrally iron occupancy as well as indicate co-associated iron-oxide phases considered as factors responsible for the structural disorder. The magnetic properties revealed the superparamagnetic behavior at the room temperature with estimated critical size of single domain particles about 63 nm. The analysis of saturation magnetization pointed to the spin canting phenomenon in the surface layer. The valuation of exchange coupling parameters based on the mean field theory calculation strengthened the conclusion about opposite magnetization arrangement between tetrahedral and octahedral magnetic sublattices.

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Section: Xps Measurementssupporting

confidence: 89%

“…Spinel ferrite nanoparticles (SF-NPs) adopting the general A 2+ Fe2 3+ O4 formula with A = Ni [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], Ni-Zn [1,2,8,, Mn [1,[60][61][62], Co [1,60,61,[63][64][65][66][67][68][69][70][71][72][73], Co-Zn [74][75][76][77][78][79], Ni-Cu [43], Zn [80][81][82][83][84][85], Mn-Zn…”

Section: Introductionmentioning

confidence: 99%

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Bajorek

Berger

Dulski

et al. 2019

Journal of Physics and Chemistry of Solids

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“…A satellite peak is present at 715.38 eV separating Fe 2p 3/2 and Fe 2p 1/2 peaks that confirm the presence of Fe 3+ ions corroborating well with XRD results [50]. Deconvolution of Fe 2p 3/2 peak in Fe 3+ (B) and Fe 3+ (A) peaks revealed the existence of Fe 3+ ions at B and A sites respectively as a result of partial-inversion of the spinel structure [51,52]. O 1s spectra deconvolved in two peaks at 530.8 and 529.46 eV that show the contribution of oxygen in different environments.…”

Section: Xps Analysissupporting

confidence: 81%

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

2020

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Nano-magnetic ferrites with composition Mg1−xZnxFe2O4 (x = 0.3, 0.4, 0.5, 0.6, and 0.7) have been prepared by coprecipitation method. X-ray diffraction (XRD) studies showed that the lattice parameter was found to increase from 8.402 to 8.424 Å with Zn2+ ion content from 0.3 to 0.7. Fourier transform infrared (FTIR) spectra revealed two prominent peaks corresponding to tetrahedral and octahedral at around 560 and 430 cm−1 respectively that confirmed the spinel phase of the samples. Transmission electron microscopy (TEM) images showed that the particle size was noted to increase from 18 to 24 nm with an increase in Zn content from x = 0.3 to 0.7. The magnetic properties were studied by vibrating sample magnetometer (VSM) and electron paramagnetic resonance (EPR) which ascertained the superparamagnetic behavior of the samples and contribution of superexchange interactions. The maximum magnetization was found to vary from 23.80 to 32.78 emu/g that increased till x = 0.5 and decreased thereafter. Further, X-ray photoelectron spectroscopy (XPS) was employed to investigate the chemical composition and substantiate their oxidation states.

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“…They demonstrated the doped samples could be used for technological applications such as a hyper-realistic piezoresistive sensor based on a composite material formed by mixing Zn 0.925 Al 0.075 O nanocrystals into polydimethylsiloxane. In another work, Liu and co-workers [ 161 ] reported the synthesis of an octahedral ZnO/ZnFe 2 O 4 heterostructure through a surfactant-free solvothermal method followed by thermal treatment. At the first step, the precursor to the ZnO/ZnFe 2 O 4 final product was synthesized using the solvothermal method in which ZnCl 2 and FeCl 3 ·6H 2 O were dissolved in ethylene glycol (EG), and to this mixture, it was added CH 3 COONa.…”

Section: Green Synthesis Methods Of Tio 2 and Zno Nanostructuresmentioning

confidence: 99%

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

et al. 2021

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Over the last two decades, oxide nanostructures have been continuously evaluated and used in many technological applications. The advancement of the controlled synthesis approach to design desired morphology is a fundamental key to the discipline of material science and nanotechnology. These nanostructures can be prepared via different physical and chemical methods; however, a green and ecofriendly synthesis approach is a promising way to produce these nanostructures with desired properties with less risk of hazardous chemicals. In this regard, ZnO and TiO2 nanostructures are prominent candidates for various applications. Moreover, they are more efficient, non-toxic, and cost-effective. This review mainly focuses on the recent state-of-the-art advancements in the green synthesis approach for ZnO and TiO2 nanostructures and their applications. The first section summarizes the green synthesis approach to synthesize ZnO and TiO2 nanostructures via different routes such as solvothermal, hydrothermal, co-precipitation, and sol-gel using biological systems that are based on the principles of green chemistry. The second section demonstrates the application of ZnO and TiO2 nanostructures. The review also discusses the problems and future perspectives of green synthesis methods and the related issues posed and overlooked by the scientific community on the green approach to nanostructure oxides.

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Surfactant-free synthesis of octahedral ZnO/ZnFe2O4 heterostructure with ultrahigh and selective adsorption capacity of malachite green

Cited by 50 publications

References 49 publications

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Zn2+ substituted superparamagnetic MgFe2O4 spinel-ferrites: Investigations on structural and spin-interactions

Green Synthesis and Applications of ZnO and TiO2 Nanostructures

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