Facile synthesis of (Ni,Co)@(Ni,Co)xFe3−xO4 core@shell chain structures and (Ni,Co)@(Ni,Co)xFe3−xO4/graphene composites with enhanced microwave absorption

Lin, Yuan; Xu, Li; Jiang, Zhiyuan; Li, Hongli; Xie, Zhaoxiong; Zheng, Lan‐Sun

doi:10.1039/c5ra12645b

Cited by 21 publications

(4 citation statements)

References 41 publications

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“…On the other hand, the XRD patterns for 3b are indexed using standard pattern (ICDD card numbers: 98‐005‐2854 for NiO and 00‐045‐1027 for Ni), respectively. [ 73,74 ] From the analysis of positions and relative intensities of the diffracted peaks, the presence of single phase monoclinic structure of NiO with a space group C12/m1 and orthorhombic structure of K 2 SO 4 with a space group Pnam for 3a is confirmed. On the other hand, the calcination of 3 reveals two different phases of NiO and Ni ( 3b ); the monoclinic structure of NiO with a space group C12/m1 and hexagonal structure of Ni with a space group P63/mmc for 3b are assigned.…”

Section: Resultsmentioning

confidence: 92%

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Momeni

Anari

Torrei

et al. 2021

Applied Organom Chemis

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A series of mono‐ and bis‐terpyridine complexes of nickel (II) based on the 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine (ftpy) have been synthesized and structurally characterized using elemental analysis, infrared spectroscopy, and single crystal X‐ray diffraction. The reaction of NiCl2•6H2O with ftpy has been resulted in the formation of new bis‐terpyridine complex [Ni (ftpy)2](PF6)•2H2O (1). The new complex [Ni (ftpy)2](PF6)2 (2), obtained during the crystallization of 1 in methanol, was characterized using X‐ray crystallography, which shows that six nitrogen atoms from terpyridine ligands occupy the coordination sites around the Ni (II) in a distorted octahedral geometry. On the other hand, the reaction of NiCl2•6H2O with ftpy in a 1:2 or 1:1 mole ratio in methanol in the presence of KSCN affords two new thiocyanato complexes [Ni (ftpy)2](SCN)2•2H2O (3) and [Ni (ftpy)(NCS)2(H2O)]•2H2O (4), respectively. The crystal structure of 3 reveals that nickel (II) is hexa‐coordinated in a distorted octahedral geometry NiN6 involving six atoms of two ftpy ligand; the ftpy ligands are perpendicular to each other. The new complex [Ni (ftpy)(NCS)2(DMSO)]•DMSO (5) is obtained during the crystallization of 4 in DMSO. The crystal structure of 5 reveals that the nickel (II) is hexa‐coordinated by three nitrogen atoms of ftpy, two NCS−, a DMSO in a slightly distorted octahedral geometry. The X–H (XH, C, N, O) bond interactions control the arrangement of the supramolecular 3D framework. Hirshfeld surface analyses and two‐dimensional fingerprint plot reveal that the main interactions are H–H contacts for 2, 3, and 5, which comprise 34.1%, 37.2%, and 34.6%, respectively. Thermal decomposition of the coordination complexes led to the formation of Ni, NiO, and Ni2P2O7 nanoparticles (NPs). The resulting NPs were fully characterized by powder XRD, field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), and energy‐dispersive X‐ray spectroscopy (EDX). The formation of these NPs indicates the role of the precursor complexes and counterion. Our results indicate that the NPs with the smaller size could be obtained at calcination temperature of 600 °C. Thermal and luminescent properties of complexes have been discussed in detail.

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Section: Resultsmentioning

confidence: 92%

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Momeni

Anari

Torrei

et al. 2021

Applied Organom Chemis

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“…Because of their catalytic properties, these compounds are ideal for several applications . In fact, nickel acetylacetonate, Ni(acac) 2 , a member of this group of complexes, is employed in optoelectronics, , electrocatalysis, polymer chemistry, , film growth, , synthesis of nanoparticles, and nanocomposites. − …”

Section: Introductionmentioning

confidence: 99%

Adsorption and Dissociation of Ni(acac)₂ on Iron by Ab Initio Calculations

2020

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Among metal β-diketonates, nickel acetylacetonate (Ni(acac) 2 ) has been widely employed as a precursor for many chemical structures, due to its catalytic properties. Here, we investigate, by means of density functional theory (DFT) calculations, the adsorption and dissociation of this complex: after an evaluation of the structural and electronic properties of Ni(acac) 2 , a comparison between different dissociation patterns reveals that the most favorable pattern for the complex adsorbed on iron is different from the one suggested by considering the strength of the bonds in the isolated complex and an attempt to generalize this dissociation model is made in this work. Moreover, the most favorable adsorption configurations turned out to be a long bridge positioning of the nickel atom along with an on top positioning of the oxygen atoms of Ni(acac) 2 , while a short bridge positioning is the most favorable for the central metallic unit alone.

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“…An effective absorber must both sufficiently reduce microwave reflection and effectively work in different antidetection wavebands. , The primary target of absorber design is impedance matching, which makes microwaves penetrate into materials without surface reflection . The classical method is to combine a special ratio of dielectric materials (e.g., SiO 2 , TiO 2 , carbon) and magnetic materials (e.g., Fe 3 O 4 , Ni, Co) via core–shell structure, multilayer design, and carrier loading. The secondary important point of structure design is to provide internal scattering via void or interface for microwave energy dissipation.…”

Section: Introductionmentioning

confidence: 99%

Excellent NiO–Ni Nanoplate Microwave Absorber via Pinning Effect of Antiferromagnetic–Ferromagnetic Interface

You

Che

2018

ACS Appl. Mater. Interfaces

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Materials with strong magnetic property that can provide excellent microwave absorption performance are highly desirable, especially if their dielectric and magnetic properties can be easily modulated, which make minimal thickness and ultrawide bandwidth become achievable. The magnetic properties of ferromagnetic (FM) and antiferromagnetic (AFM) composite materials are closely related to their ratio of composition, size, morphology, and structure. AFM-FM composites have become a popular alternative for microwave absorption; however, the controllable design and preparation need to be urgently optimized. Here, we have successfully prepared a series of platelike NiO-Ni composites and demonstrated the potential of such composites for microwave absorption. Strong magnetic coupling was found from NiO-Ni nanoparticles by electron holography, which makes NiO-Ni composites a highly efficient microwave absorber (strong reflection loss: -61.5 dB and broad bandwidth: 11.2 GHz, reflection loss < -10 dB). Our findings are helpful to develop a strong microwave absorber based on magnetic coupling.

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Facile synthesis of (Ni,Co)@(Ni,Co)_xFe_3−xO₄ core@shell chain structures and (Ni,Co)@(Ni,Co)_xFe_3−xO₄/graphene composites with enhanced microwave absorption

Abstract: A facile strategy was developed to synthesize a series of multiple metal@metal oxide hybrid structures, such as (Ni,Co)

Cited by 21 publications

References 41 publications

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Adsorption and Dissociation of Ni(acac)₂ on Iron by Ab Initio Calculations

Excellent NiO–Ni Nanoplate Microwave Absorber via Pinning Effect of Antiferromagnetic–Ferromagnetic Interface

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Facile synthesis of (Ni,Co)@(Ni,Co)xFe3−xO4 core@shell chain structures and (Ni,Co)@(Ni,Co)xFe3−xO4/graphene composites with enhanced microwave absorption

Abstract: A facile strategy was developed to synthesize a series of multiple metal@metal oxide hybrid structures, such as (Ni,Co)

Cited by 21 publications

References 41 publications

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Crystal exploring, Hirshfeld surface analysis, and properties of 4′‐(furan‐2‐yl)‐2,2′:6′,2″‐terpyridine complexes of nickel (II): New precursors for the synthesis of nanoparticles

Adsorption and Dissociation of Ni(acac)2 on Iron by Ab Initio Calculations

Excellent NiO–Ni Nanoplate Microwave Absorber via Pinning Effect of Antiferromagnetic–Ferromagnetic Interface

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Product

Resources

About

Facile synthesis of (Ni,Co)@(Ni,Co)_xFe_3−xO₄ core@shell chain structures and (Ni,Co)@(Ni,Co)_xFe_3−xO₄/graphene composites with enhanced microwave absorption

Adsorption and Dissociation of Ni(acac)₂ on Iron by Ab Initio Calculations