Structure and Hyperfine Interactions of Fe-Doped ZnO Powder Prepared by Co-Precipitation Method

Grotel, Jakub; Pikula, T.; Siedliska, Karolina; Ruchomski, Leszek; Panek, Rafał; Wierteł, M.; Jartych, E.

doi:10.12693/aphyspola.134.1048

Cited by 5 publications

(2 citation statements)

References 21 publications

(32 reference statements)

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“…Our obtained c/a ratio in all samples is significantly smaller in comparison to an ideal stoichiometric wurtzite structure (c/a = 1.6330). This result may be an indication of the presence of oxygen and/or zinc vacancies in the ZnO lattice, which are formed to keep charge neutrality [43]. The presence of oxygen and zinc vacancies can be seen from the photoluminescence (PL) spectra of Fe-ZnO nanoparticles as shown in Figure 5 (a) and Figure 6 (a and c).…”

Section: Rietveld Analysis Of Xrd Data On Fe-znomentioning

confidence: 91%

A Comparative Study of Structural, Optical and Electrical Properties of Fe-ZnO Nanoparticles Synthesized by Precipitation and Microwave Method for Photovoltaic Applications

Neupane¹,

Kaphle²,

Mcllroy³

et al. 2021

JEPT

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Iron doped ZnO (Fe-ZnO) nanoparticles were synthesized using two techniques that are economical as well as scalable to yield tunable properties of nanoparticles for facilitating down conversion in an absorbing layer of a solar cell. To evaluate the suitability of Fe-ZnO nanoparticles prepared by two deposition methods, we present a comparison of optical, electrical, and structural properties of Fe-ZnO using several experimental techniques. Structural properties were analyzed using transmission electron microscopy and x-ray diffraction spectroscopy (XRD) with Rietveld analysis for extracting information on compositional variations with Fe doping. The chemical composition of nanoparticles was analyzed through X-ray photoelectron spectroscopy (XPS). The optical properties of nanoparticles were studied using photoluminescence and UV-Vis absorption spectroscopy. In addition, fluorescence lifetime measurement was also performed to study the changes in an exponential decay of lifetimes. The electrical transport properties of Fe-ZnO were analyzed by impedance spectroscopy. Our studies indicate that ethanol as a solvent in a microwave method would produce smaller nanoparticles up to the size of 11 nm. In contrast, the precipitation method produces secondary phases of Fe2O3 beyond 5% doping. In addition, our studies show that the optical and electrical properties of resulting Fe-ZnO nanoparticles depend on the particle sizes and the synthesis techniques used. These new results provide insight into the role of solvents in fabricating Fe-ZnO nanoparticles by precipitation and microwave methods for photovoltaic and other applications.

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Section: Rietveld Analysis Of Xrd Data On Fe-znomentioning

confidence: 91%

A Comparative Study of Structural, Optical and Electrical Properties of Fe-ZnO Nanoparticles Synthesized by Precipitation and Microwave Method for Photovoltaic Applications

Neupane¹,

Kaphle²,

Mcllroy³

et al. 2021

JEPT

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“…At an optimal dose of 500 µg/mL, the time for complete disinfection for Fe/ZnO NPs was relatively shorter (i.e., 80 min) when compared to undoped ZnO (120 min) and TiO 2 (180 min) as shown in Figure 38b (inset). By doping with Fe, Fe 3+ ions replaced Zn 2+ ions at tetrahedral sites of ZnO [307]. Under solar light irradiation, Fe 3+ ions acted as the hole and electron traps, thus promoting the ROS generation.…”

Section: Metal Dopingmentioning

confidence: 99%

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

Liao

Tjong

2020

IJMS

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This article reviews the recent developments in the synthesis, antibacterial activity, and visible-light photocatalytic bacterial inactivation of nano-zinc oxide. Polycrystalline wurtzite ZnO nanostructures with a hexagonal lattice having different shapes can be synthesized by means of vapor-, liquid-, and solid-phase processing techniques. Among these, ZnO hierarchical nanostructures prepared from the liquid phase route are commonly used for antimicrobial activity. In particular, plant extract-mediated biosynthesis is a single step process for preparing nano-ZnO without using surfactants and toxic chemicals. The phytochemical molecules of natural plant extracts are attractive agents for reducing and stabilizing zinc ions of zinc salt precursors to form green ZnO nanostructures. The peel extracts of certain citrus fruits like grapefruits, lemons and oranges, acting as excellent chelating agents for zinc ions. Furthermore, phytochemicals of the plant extracts capped on ZnO nanomaterials are very effective for killing various bacterial strains, leading to low minimum inhibitory concentration (MIC) values. Bioactive phytocompounds from green ZnO also inhibit hemolysis of Staphylococcus aureus infected red blood cells and inflammatory activity of mammalian immune system. In general, three mechanisms have been adopted to explain bactericidal activity of ZnO nanomaterials, including direct contact killing, reactive oxygen species (ROS) production, and released zinc ion inactivation. These toxic effects lead to the destruction of bacterial membrane, denaturation of enzyme, inhibition of cellular respiration and deoxyribonucleic acid replication, causing leakage of the cytoplasmic content and eventual cell death. Meanwhile, antimicrobial activity of doped and modified ZnO nanomaterials under visible light can be attributed to photogeneration of ROS on their surfaces. Thus particular attention is paid to the design and synthesis of visible light-activated ZnO photocatalysts with antibacterial properties

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