Effect of Ag clusters doping on the photoluminescence, photocatalysis and magnetic properties of ZnO nanorods prepared by facile microwave-assisted hydrothermal synthesis

Souza, Ricardo Pires de; Motta, F. V.; Nascimento, José Heriberto Oliveira do; Bomio, M. R. D.; Borges, F. M. M.; Corrêa, M.A.; Longo, Elson; Li, M. S.; Bohn, F.; Paskocimas, C. A.

doi:10.1007/s10854-017-6890-x

Cited by 4 publications

(4 citation statements)

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“…[32], where a systematic study of the ferromagnetism induction on ZnO films using different non-magnetic metals is presented, in which a 10 nm-thick layer was deposited onto the ZnO film, and where no magnetic response for the as-cast samples is observed. Similar results are observed for the pure ZnO material [1,11,32].…”

Section: Magnetic Resultssupporting

confidence: 86%

“…From these curves, we can observe a weak ferromagnetic behavior. In particular, similar features for the isothermal magnetization curves have already been observed for nanoparticles composed by Ag-doped ZnO and V-doped ZnO alloy [11,31]. Figure 8 shows the magnetization curves measured at room temperature for all films.…”

Section: Magnetic Resultssupporting

confidence: 74%

“…In this context, the ZnO and metal-doped ZnO have been explored in distinct samples geometries. For nanoparticles (powder), the magnetic properties are studied in a wide range of temperatures, including room temperature [ 1 , 8 , 9 , 10 , 11 ]. On the other hand, considering the film geometry, the deposition technique, the deposition parameters and thicknesses of the films can be taken to advantage to change not just the structural properties of the ZnO and/or metal-doped ZnO, but also the magnetic properties, leading to interesting multifunctional materials for technological applications [ 7 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Response Dependence of ZnO Based Thin Films on Ag Doping and Processing Architecture

et al. 2020

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Multifunctional and multiresponsive thin films are playing an increasing role in modern technology. This work reports a study on the magnetic properties of ZnO and Ag-doped ZnO semiconducting films prepared with a zigzag-like columnar architecture and their correlation with the processing conditions. The films were grown through Glancing Angle Deposition (GLAD) co-sputtering technique to improve the induced ferromagnetism at room temperature. Structural and morphological characterizations have been performed and correlated with the paramagnetic resonance measurements, which demonstrate the existence of vacancies in both as-cast and annealed films. The magnetic measurements reveal changes in the magnetic order of both ZnO and Ag-doped ZnO films with increasing temperature, showing an evolution from a paramagnetic (at low temperature) to a diamagnetic behavior (at room temperature). Further, the room temperature magnetic properties indicate a ferromagnetic order even for the un-doped ZnO film. The results open new perspectives for the development of multifunctional ZnO semiconductors, the GLAD co-sputtering technique enables the control of the magnetic response, even in the un-doped semiconductor materials.

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Section: Magnetic Resultssupporting

confidence: 86%

Section: Magnetic Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Magnetic Response Dependence of ZnO Based Thin Films on Ag Doping and Processing Architecture

et al. 2020

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“…From a general perspective, these studies explore the multifunctionality of ZnO and doped ZnO:NFM materials for future biosensor applications [ 20 , 21 , 22 , 34 , 35 , 36 ]. In particular, Zhu and co-workers [ 20 ] presented a systematic study of ZnO-based nanostructures for biosensor applications.…”

Section: Introductionmentioning

confidence: 99%

Improving the Room-Temperature Ferromagnetism in ZnO and Low-Doped ZnO:Ag Films Using GLAD Sputtering

et al. 2021

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ZnO and doped ZnO films with non-ferromagnetic metal have been widely used as biosensor elements. In these studies, the electrochemical measurements are explored, though the electrical impedance of the system. In this sense, the ferromagnetic properties of the material can be used for multifunctionalization of the sensor element using external magnetic fields during the measurements. Within this context, we investigate the room-temperature ferromagnetism in pure ZnO and Ag-doped ZnO films presenting zigzag-like columnar geometry. Specifically, we focus on the films’ structural and quasi-static magnetic properties and disclose that they evolve with the doping of low-Ag concentrations and the columnar geometry employed during the deposition. The magnetic characterization reveals ferromagnetic behavior at room temperature for all studied samples, including the pure ZnO one. By considering computational simulations, we address the origin of ferromagnetism in ZnO and Ag-doped ZnO and interpret our results in terms of the Zn vacancy dynamics, its substitution by an Ag atom in the site, and the influence of the columnar geometry on the magnetic properties of the films. Our findings bring to light an exciting way to induce/explore the room-temperature ferromagnetism of a non-ferromagnetic metal-doped semiconductor as a promising candidate for biosensor applications.

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Modulation of the magnetoimpedance effect of ZnO:Ag/NiFe heterostructures by thermal annealing

et al. 2020

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The magnetization dynamics in ZnO:Ag/NiFe heterostructures has been investigated through magnetoimpedance measurements. By annealing the ZnO:Ag layer during the production process of the samples, structural and magnetic features of the whole heterostructure are modified, showing that the dynamical magnetic response of the heterostructure is strongly dependent on the annealing temperature. The magnetoimpedance results are discussed in terms of the different mechanisms governing the magnetization dynamics at distinct frequency ranges and in terms of the evolution of the ZnO:Ag layer with annealing. The presented results open new roads for technological application of semiconductor/ferromagnetic heterostructures.

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Effect of Ag clusters doping on the photoluminescence, photocatalysis and magnetic properties of ZnO nanorods prepared by facile microwave-assisted hydrothermal synthesis

Abstract: to the decreased gap. We interpret the magnetic properties in terms of the nanosizing and similar effects. Under these conditions, we show the improvement of the photocatalytic and magnetic properties of ZnO NPs.

Cited by 4 publications

References 51 publications

Magnetic Response Dependence of ZnO Based Thin Films on Ag Doping and Processing Architecture

Magnetic Response Dependence of ZnO Based Thin Films on Ag Doping and Processing Architecture

Improving the Room-Temperature Ferromagnetism in ZnO and Low-Doped ZnO:Ag Films Using GLAD Sputtering

Modulation of the magnetoimpedance effect of ZnO:Ag/NiFe heterostructures by thermal annealing

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