Low-Temperature Magnetic Properties of Vanadium-Doped ZnO Nanoparticles

Gazzali, P. M. Mohammed; Rajan, Soumya; Chandrasekaran, G.

doi:10.1007/s10948-017-4537-z

Cited by 11 publications

(5 citation statements)

References 65 publications

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“…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%

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: 74%

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

et al. 2020

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“…A similar problem was observed for vanadium-doped ZnO nanoparticles. In this case, zinc nitrate hexahydrate and glycine were used as a precursor and to fuel for the reaction, respectively [ 173 ]. The dopant precursor was ammonium metavandate (NH4VO3) while water was used as solvent.…”

Section: Synthesis Methods and Characterizationmentioning

confidence: 99%

Doped Zinc Oxide Nanoparticles: Synthesis, Characterization and Potential Use in Nanomedicine

et al. 2020

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Smart nanoparticles for medical applications have gathered considerable attention due to an improved biocompatibility and multifunctional properties useful in several applications, including advanced drug delivery systems, nanotheranostics and in vivo imaging. Among nanomaterials, zinc oxide nanoparticles (ZnO NPs) were deeply investigated due to their peculiar physical and chemical properties. The large surface to volume ratio, coupled with a reduced size, antimicrobial activity, photocatalytic and semiconducting properties, allowed the use of ZnO NPs as anticancer drugs in new generation physical therapies, nanoantibiotics and osteoinductive agents for bone tissue regeneration. However, ZnO NPs also show a limited stability in biological environments and unpredictable cytotoxic effects thereof. To overcome the abovementioned limitations and further extend the use of ZnO NPs in nanomedicine, doping seems to represent a promising solution. This review covers the main achievements in the use of doped ZnO NPs for nanomedicine applications. Sol-gel, as well as hydrothermal and combustion methods are largely employed to prepare ZnO NPs doped with rare earth and transition metal elements. For both dopant typologies, biomedical applications were demonstrated, such as enhanced antimicrobial activities and contrast imaging properties, along with an improved biocompatibility and stability of the colloidal ZnO NPs in biological media. The obtained results confirm that the doping of ZnO NPs represents a valuable tool to improve the corresponding biomedical properties with respect to the undoped counterpart, and also suggest that a new application of ZnO NPs in nanomedicine can be envisioned.

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“…The intraparticle interaction due to RE doping emphasizes the preferential growth pattern or the heterovalency of the NPs. [ 45,46 ] Figure 9b clearly shows that the NPs are clustered agglomerations. The high‐resolution TEM micrograph of the ZnOY5 sample shown in Figure 9c specifies the well‐defined interplanar spacing of 0.286 nm conforming to the (101) plane of hexagonal wurtzite ZnO, which is in accordance with the interplanar spacing value obtained from the XRD results.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Ultraviolet Band Absorption and Emission Features of ZnO Nanoparticles Through the Crystallite Size and Lattice Strain Modulation: Role of Yttrium Ions

Kumari

Nirmala

Chidhambaram

et al. 2022

Physica Status Solidi (b)

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Due to their unique characteristics, semiconductors have undergone a blooming revolution in recent decades. Among the multifarious semiconductor nanomaterials such as TiO 2 , SnO 2 , ZnO, ZrO 2 , CeO 2 , NiO, Fe 2 O 3 , In 2 O 3 , and ZnO paved a new way for the research community to explore the nanotechnology field. ZnO is a multipurpose II-VI group n-type semiconductor compound with remarkable chemical and thermal stabilities, a wide direct bandgap of 3.3 eV, a high exciton binding energy of 60 meV, and great level transparency at ambient temperature. [1][2][3] Further, ZnO possesses high thermal and chemical stability. [4] The aforementioned characteristics show that ZnO is a highly alluring material with a wide range of applications, including solar cells, lightemitting diodes, piezoelectric devices, laser diodes, thin-film resistors, sensors, paints, photocatalysts, and antibacterial agents. [5][6][7][8][9][10][11] ZnO is an amphoteric oxide and naturally crystallizes in a hexagonal wurtzite structure with space group P6 3mc . It is highly active under ultraviolet light irradiation that limits its usage in the region. [3] Metal ion-doped semiconductors tune the bandgap, structural modification, and alter the luminescent properties of ZnO. Recently, the research community has piled up their core interest in doping ZnO with rare earth elements in particular Y, Sc, Eu, Tb, etc. because of their localized, partially occupying 4f electrons that emphasize the transmittance performance in the visible region and minimizes the natal point defect densities in ZnO. [12,13] It is observed that the Sc-doped ZnO increases visible light wavelength transmittance, Eu-doped ZnO serves as an ideal photocatalytic agent, and Y-doped ZnO enhances the luminescent properties of ZnO. [12,14,15] Among the various RE elements cited above, Y is more significant as the atomic radius is greater than that of Zn, and several oxygen voids emerge due to the phase segregation of Y 3þ ions. [1] The current research work involves the synthesis of REM ion Y-doped ZnO nanoparticles (NPs) with various concentrations of yttrium by a simple co-precipitation method. Several analytical techniques were deployed to investigate the modification of structural, optical, surface

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Low-Temperature Magnetic Properties of Vanadium-Doped ZnO Nanoparticles

Cited by 11 publications

References 65 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

Doped Zinc Oxide Nanoparticles: Synthesis, Characterization and Potential Use in Nanomedicine

Tailoring Ultraviolet Band Absorption and Emission Features of ZnO Nanoparticles Through the Crystallite Size and Lattice Strain Modulation: Role of Yttrium Ions

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