Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

Reddy, A. Jagannatha; Kokila, M.K.; Nagabhushana, H.; Shivakumara, C.; Chakradhar, R.P.S.; Nagabhushana, B.M.; Krishna, R. Hari

doi:10.1016/j.saa.2014.04.064

Cited by 25 publications

(2 citation statements)

References 34 publications

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“…Simple Eu 2+ ‐doped nanooxides include ZnO, SnO 2 , TiO 2 , and Gd 2 O 3 , and have emission wavelengths spanning from blue to the orange region (≈430–590 nm); however, these phosphors lack crystallographically appropriate cation sites into which Eu 2+ may be doped.…”

Section: Nanophosphors For Microledsmentioning

confidence: 99%

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Zhou

Leaño

Liu³

et al. 2018

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Half a century after its initial emergence, lanthanide photonics is facing a profound remodeling induced by the upsurge of nanomaterials. Lanthanide-doped nanomaterials hold promise for bioapplications and photonic devices because they ally the unmatched advantages of lanthanide photophysical properties with those arising from large surface-to-volume ratios and quantum confinement that are typical of nanoobjects. Cutting-edge technologies and devices have recently arisen from this association and are in turn promoting nanophotonic materials as essential tools for a deeper understanding of biological mechanisms and related medical diagnosis and therapy, and as crucial building blocks for next-generation photonic devices. Here, the recent progress in the development of nanomaterials, nanotechnologies, and nanodevices for clinical uses and commercial exploitation is reviewed. The candidate nanomaterials with mature synthesis protocols and compelling optical uniqueness are surveyed. The specific fields that are directly driven by lanthanide doped nanomaterials are emphasized, spanning from in vivo imaging and theranostics, micro-/nanoscopic techniques, point-of-care medical testing, forensic fingerprints detection, to micro-LED devices.

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Section: Nanophosphors For Microledsmentioning

confidence: 99%

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Zhou

Leaño

Liu³

et al. 2018

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141

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“…Regarding Eu-doped ZnO, there is a large variety of structures reported, including thin films, rods/wires, sea urchins, cauliflower-like balls, and powders, achieved by a wide range of chemical and physical synthesis routes, including radio frequency sputtering, − pulsed laser deposition, ion implantion, , chemical vapor deposition, vapor transport deposition, ,− spray pyrolysis, , solid-state synthesis, ,, electrochemical synthesis, − combustion synthesis, − precipitation and hydro-/solvothermal synthesis, − hydrothermal microemulsion processing, sonochemically assisted precipitation, chemical solution deposition, − and metal–organic decomposition . A more detailed review of the results given in these references is provided in Review S1.…”

Section: Introductionmentioning

confidence: 99%

Fast, Low-Cost Synthesis of ZnO:Eu Nanosponges and the Nature of Ln Doping in ZnO

et al. 2020

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A low-cost template-free solution chemical route to highly porous nanocrystalline sponges of ZnO-EuO 1.5 with 0−5 mol % Eu is presented. The process uses Zn− and Eu−acetate− nitrate and triethanolamine as precursors in methanol. After evaporation of the solvent and heating at 200 °C for 3 min, crystalline ZnO:Eu sponges with minor amounts of organic residues were obtained. Heating to 400 °C replaced the organics with carbonate, which in its turn was decomposed at temperatures below 600 °C, forming ZnO:Eu sponges. Samples heated to 200− 1000 °C for 3 min were studied with XRD, SEM, TEM, TG, XPS, and IR spectroscopy. The ZnO:Eu crystallite sizes could be tuned from below 10 nm for sponges prepared at 200−500 °C, to over 100 nm range at 900 °C, without sintering of the overall microstructure. XRD showed the presence of hexagonal ZnO:Eu (or at 700−1000 °C, ZnO:Eu and cubic Eu 2 O 3 ) as the only phases present. The ZnO:Eu had slightly larger unit cell dimensions than the literature value of ZnO for samples obtained at 200−600 °C, while the unit cells of samples obtained at higher temperatures were quite close to the value of undoped ZnO. XPS showed that Eu was mainly in its 3+ state and well-distributed within the sponges but segregated at the ZnO sponge surface upon heating at 700− 1000 °C, in accordance with XRD studies showing Eu 2 O 3 formation.

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Ru‐Induced Defect Engineering in Co₃O₄ Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium

Lim,

Ma,

O'Connell

et al. 2024

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Amidst these growing sustainability concerns, producing NH4+ via electrochemical NO3− reduction reaction (NO3RR) emerges as a promising alternative to the conventional Haber‐Bosch process. In a pioneering approach, this study introduces Ru incorporation into Co3O4 lattices at the nanoscale and further couples it with electroreduction conditioning (ERC) treatment as a strategy to enhance metal oxide reducibility and induce oxygen vacancies, advancing NH4+ production from NO3RR. Here, supported by a suite of ex situ and in situ characterization measurements, the findings reveal that Ru enrichment promotes Co species reduction and oxygen vacancy formation. Further, as evidenced by the theoretical calculations, Ru integration lowers the energy barrier for oxygen vacancy formation, thereby facilitating a more energy‐efficient NO3RR‐to‐NH4+ pathway. Optimal catalytic activity is realized with a Ru loading of 10 at.% (named 10Ru/Co3O4), achieving a high NH4+ production rate (98 nmol s−1 cm−2), selectivity (97.5%) and current density (≈100 mA cm−2) at −1.0 V vs RHE. The findings not only provide insights into defect engineering via the incorporation of secondary sites but also lay the groundwork for innovative catalyst design aimed at improving NH4+ yield from NO3RR. This research contributes to the ongoing efforts to develop sustainable electrochemical processes for nitrogen cycle management.

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Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

Cited by 25 publications

References 34 publications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Fast, Low-Cost Synthesis of ZnO:Eu Nanosponges and the Nature of Ln Doping in ZnO

Ru‐Induced Defect Engineering in Co₃O₄ Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium

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Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

Cited by 25 publications

References 34 publications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Fast, Low-Cost Synthesis of ZnO:Eu Nanosponges and the Nature of Ln Doping in ZnO

Ru‐Induced Defect Engineering in Co3O4 Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium

Contact Info

Product

Resources

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Ru‐Induced Defect Engineering in Co₃O₄ Lattice for High Performance Electrochemical Reduction of Nitrate to Ammonium