Dielectric and magnetic properties of nanoporous nickel doped zinc oxide for spintronic applications

Jeyasubramanian, K.; William, R. V.; Thiruramanathan, P.; Hikku, G.S.; Kumar, Mirgender; Ashima, B.; Veluswamy, Pandiyarasan; Ikeda, Hiroya

doi:10.1016/j.jmmm.2019.04.032

Cited by 33 publications

(3 citation statements)

References 59 publications

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“…The cause of this phenomenon may be that zinc oxide destroyed the hydrogen bonds in the BC. As shown in Figure 5C–E, obvious diffraction peaks appeared in the range of 30°–40°, which was consistent with the characteristic peak of zinc oxide, [ 35 , 36 ] indicating that the experimental method for synthesizing zinc oxide was feasible. It was also observed that the characteristic peaks were more clearly as the concentration of zinc oxide increased in C–E.…”

Section: Resultssupporting

confidence: 68%

Preparation, Characterization, and Cytotoxicity Evaluation of Zinc Oxide–Bacterial Cellulose–Chitosan Hydrogels for Antibacterial Dressing

Jiang

Zhou²

2020

Macro Chemistry & Physics

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Lin et al. evaluated the cell compatibility and antibacterial activity of bacterial cellulose-chitosan (BC-CS) membranes in vitro. [6] BC is widely used in antibacterial aspects. Wu et al. proposed a preparation method of slow-released antimicrobial wound dressing. [7] Common antibacterial agents for improving BC include benzalkonium chloride, [8] copper, silver, ZnO nanoparticles, sulfadiazine silver, [9] polyhexamethylene guanidine hydrochloride (PHMB), [10] sericin, CS, propolis, [11] and so on. Recently, some researchers were interested in sericin. Napavichayanun et al. [12] combined sericin with PHMB to develop a dressing that was beneficial to the wound. The modified cotton fabric prepared by Doakhan et al. using sericin and nano-TiO 2 had well antibacterial activity and durability. [13] Maneerung et al. used a chemical reduction method to prepare BC antibacterial wound dressings containing silver nanoparticles. [14] CS was obtained by deacetylation of chitin, which was the most abundant naturally occurring biopolymer after cellulose. [15] CS is considered to be a promising biomedical material because of its good biocompatibility, rich functional groups, nontoxicity, degradability, and antibacterial properties. Although CS and BC had such significant advantages, related studies had shown that they were rarely used alone. The reason was that the hydrogels formed by CS had low mechanical strength [16] such as poor flexibility and low ability to elongate and the BC hydrogels itself did not have antibacterial properties. [17,18] CS could be combined with other biopolymers to improve properties. Wu et al. [19] enhanced the mechanical strength of CS by adding oxidized chitin nanocrystals to the CS film. To the best of our knowledge, zinc oxide had not been reported in CS and BC composite hydrogels. Some studies only considered a single factor, which leaded to some inevitable defects. For example, the composite hydrogels were formed by using BC and CS, but the antibacterial property was low due to partial reaction of the amino group on the CS. For example, Liang et al. found that the antimicrobial efficiency of composite films against Escherichia coli was reduced. [20] On the other hand, excessive zinc oxide can cause severe cytotoxicity. Vandebriel et al. suggested that zinc oxide nanoparticles may be cytotoxic In this work, a kind of novel antibacterial and biocompatible composite hydrogels composed of zinc oxide, bacterial cellulose (BC), and chitosan (CS) are prepared via immersing the oxidized BC hydrogels in CS solution and then combining zinc oxide in alkaline environment. The structure and properties of the composite hydrogels are characterized by different techniques. The results of Fourier transform infrared spectroscopy and X-ray diffraction prove the successful preparation of composite hydrogels. Scanning electron microscopy is used to study the microscopic morphology of hydrogels. The results show that the zinc oxide particles are successfully attached to the bacterial cellulose. From the results of t...

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Section: Resultssupporting

confidence: 68%

Preparation, Characterization, and Cytotoxicity Evaluation of Zinc Oxide–Bacterial Cellulose–Chitosan Hydrogels for Antibacterial Dressing

Jiang

Zhou²

2020

Macro Chemistry & Physics

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“…In recent years, the p-and n-types metal oxide semiconductors have gained more attention owing to their applicable dependent electrical, optoelectronic, magnetic and dielectric energy storage properties [1][2][3]. The modern renewable resources such as solar power and wind enable the electrical energy to being produced in a mass amount [4].…”

Section: Introductionmentioning

confidence: 99%

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Youssef

Yakout

2023

J Mater Sci: Mater Electron

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Tetra-doping by (Mn, Fe, Co, Ni) ions strongly boosted the room temperature dielectric constant and the ferromagnetic-superparamagnetic characteristics of monoclinic CuO structure. In this study, undoped CuO, Cu0.98Mn0.005Fe0.005Co0.005Ni0.005O, Cu0.96Mn0.01Fe0.01Co0.01Ni0.01O and Cu0.94Mn0.015Fe0.015Co0.015Ni0.015O nanocompositions were synthesized through coprecipitation technique. The crystal structure analysis verified that all samples have a pure single phase, corresponding to monoclinic CuO structure. The substitution of Cu2+-sites into CuO lattice by Mn2+, Fe2+/3+, Co2+ and Ni2+ ions has been deduced from the expansions of lattice constant, shifts of XRD diffraction peaks and band gap energy alteration. The additions of (Mn, Fe, Co, Ni) ions lead to the formation of homogenous distributed very fine spherical nanoparticles, especially at large concentrations of dopants (Cu0.94Mn0.015Fe0.015Co0.015Ni0.015O sample). The tetra-doping by (Mn, Fe, Co, Ni) ions reduced the intensity of the diffuse reflectance alongside red shifted the absorption edge and the band gap energy of monoclinic CuO structure. Cu0.98Mn0.005Fe0.005Co0.005Ni0.005O exhibits a high relative permittivity value of 6096 at low frequency of 42 Hz with small dielectric loss tangent (tan δ) compared to pure one. The tetra-doping by (Mn, Fe, Co, Ni) dopants induced excellent intrinsic ferromagnetic and superparamagnetic hysteresis loops into monoclinic CuO structure with full saturation loops shape and variable coercivity values.

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“…Recently, through proper doping and alloying, ZnO can be made piezoelectric, transparent and conducting or resistive switching leading to multifunctional. An example of this, the 3d-transition metal ions such as, 𝐹𝐹𝐹𝐹 3+ [12], 𝑀𝑀𝑀𝑀 2+ [13], 𝐶𝐶𝐶𝐶 2+ [11] and 𝑁𝑁𝑁𝑁 2+ [14] have been introduced into the ZnO lattice to exploit both their spin and charge to have possible use in spintronic devices. However, the majority of the reported studies focused only on the evaluation of electrical, optical and magnetic properties of these films, and fewer studies have investigated their mechanical properties [15 -17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Transition Metals on the Mechanical Properties of ZnO Thin Films, Prepared by Sol-Gel Method

Benzitouni

Zaabat

Ebothé

et al. 2020

JNanoR

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Undoped and transition metals (TM = Cr, Ni, Mn and Cd) doped zinc oxide (ZnO) thin films were prepared by sol-gel dip-coating method on glass substrates at 300 °C. In this study, the effect of dopant material on the structural, morphological, optical, electrical and mechanical properties of ZnO thin films is investigated by using XRD, AFM, UV-Vis, Hall effect and nanoindentation techniques, respectively. Nanocrystalline films with a ZnO hexagonal wurtzite structure and two preferred orientations (002) and (103) were obtained. UV-Vis transmittance spectra showed that all the films are highly transparent in the visible region (> 80 %). Moreover, the optical band gap of the films decreased to 3.13 eV with an increasing orbital occupation number of 3d electrons. AFM-topography shows that the films are dense, smooth and uniform, except for the high roughness RMS =26.3 nm obtained for Cd-doped ZnO. Finally, the dopant material is found to have a significant effect on the mechanical behavior of ZnO as compared to the undoped material. For Ni and Cd dopants, analysis of load and unload data yields an increase in the hardness (8.96 ± 0.22 GPa) and Young’s modulus (122 ± 7.46 GPa) of ZnO as compared to Cr and Mn dopants. Therefore, Ni and Cd are the appropriate dopants for the design and application of ZnO-based nanoelectromechanical systems.

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Dielectric and magnetic properties of nanoporous nickel doped zinc oxide for spintronic applications

Cited by 33 publications

References 59 publications

Preparation, Characterization, and Cytotoxicity Evaluation of Zinc Oxide–Bacterial Cellulose–Chitosan Hydrogels for Antibacterial Dressing

Preparation, Characterization, and Cytotoxicity Evaluation of Zinc Oxide–Bacterial Cellulose–Chitosan Hydrogels for Antibacterial Dressing

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Effect of Transition Metals on the Mechanical Properties of ZnO Thin Films, Prepared by Sol-Gel Method

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