Cold plasma treatment of ZnO:Er nano- and microrods: The effect on luminescence and defects creation

Buryi, M.; Remeš, Z.; Babin, V.; Artemenko, Anna; Chertopalov, Sergii; Míčová, Júlia

doi:10.1016/j.jallcom.2021.162671

Cited by 19 publications

(34 citation statements)

References 81 publications

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“…These effects were pronounced in the ZnO:Mo(0.05%) and negligible in the ZnO:Mo(0.25 and 1%) due to the presence of large amount of Mo covering the surface. This was presently confirmed by EDX (see also XPS results in the previous work [ 34 ]). Molybdenum holds more oxygen due to Mo 4+,6+ oxidation states at the surface and thus acts as a shield from the contact with plasma along with the molybdenum-based material phases.…”

Section: Resultssupporting

confidence: 82%

“…PDF00-021-0574, not present in the ZnO:Mo(0.05%) sample) and, probably, Zn 2 Mo 3 O 8 phase preferentially oriented along {100} (JCPDS card #01-076-1737, not present in the ZnO:Mo(0.05%) sample) as also reported in Ref. [ 34 ]. The XRD patterns are shown in more detail in Figure S1 in the Supplementary Information .…”

Section: Resultssupporting

confidence: 66%

“…Analysis of X-ray diffraction patterns of the as-grown ZnO:Mo(0.05, 0.25 and 1%) nanorods ( Figure 1 A) allowed us to conclude that these samples were not pure phase hexagonal Wurtzite ZnO (record No.00-005-0664) [ 34 ], but contain some other, unintentional phases besides the ZnO one.…”

Section: Resultsmentioning

confidence: 99%

“…Further increase in the annealing temperature led to slight decrease in the band [ 20 , 29 ]. This was explained by the two-component origin of the band (ascribed to the neutral zinc vacancy), and the interplay between them and participation of the zinc vacancy in the charge trapping processes [ 21 , 34 ]. Exciton emission at about 3.25 eV was improved by the annealing in air at 350 °C and suppressed at the higher temperatures [ 20 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…Similar effects were observed for ZnO:Mo thin films with similar Mo doping levels [ 20 ]. Plasma hydrogenation resulted in an increase in the exciton emission of ZnO:Er nano- and microrods [ 34 ]; therefore, it was also the task of the present research, to search for an effective tool for improvement of ultrafast exciton emission. The defect states were also studied by EPR in ZnO:Mo samples as reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

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Free-Standing ZnO:Mo Nanorods Exposed to Hydrogen or Oxygen Plasma: Influence on the Intrinsic and Extrinsic Defect States

et al. 2022

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Cationic doping of ZnO nanorods has gained increased interest as it can lead to the production of materials with improved luminescent properties, electrical conductivity and stability. We report on various Mo-doped ZnO powders of nanorods synthesized by the hydrothermal growth method. Further annealing or/and cold hydrogen or oxygen plasma modification was applied. The atomic structure of the as-grown and plasma-modified rods was characterized by X-ray diffraction. To identify any possible changes in morphology, scanning electron microscopy was used. Paramagnetic point defects were investigated by electron paramagnetic resonance. In particular, two new types of defects were initiated by the plasma treatment. Their appearance was explained, and corresponding mechanisms were proposed. The changes in the luminescence and scintillation properties were characterized by photo- and radioluminescence, respectively. Charge trapping phenomena were studied by thermally stimulated luminescence. Cold plasma treatment influenced the luminescence properties of ZnO:Mo structures. The contact with hydrogen lead to an approximately threefold increase in intensity of the ultraviolet exciton-related band peaking at ~3.24 eV, whereas the red band attributed to zinc vacancies (~1.97 eV) was suppressed compared to the as-grown samples. The exciton- and defect-related emission subsided after the treatment in oxygen plasma.

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Free-Standing ZnO:Mo Nanorods Exposed to Hydrogen or Oxygen Plasma: Influence on the Intrinsic and Extrinsic Defect States

et al. 2022

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Transfer Printing of Solution‐Processed 3D ZnO Nanostructures with Ultra‐High Yield for Flexible Metasurface Color Filter

Liu

Peng

et al. 2022

Adv Materials Inter

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This work describes a facile thermal transfer printing process for solution‐processed high‐quality ZnO nanostructures. Nanostructures are synthesized through patterned solution growth and transfer‐printed onto a polymer substrate with an inverted configuration. Thus, the shape of the solution‐processed ZnO nanostructures can be regulated to have diversified forms, clearly defined edges, and improved surface profiles. To further demonstrate the scalability of such transfer printing process, a metasurface color filter with 300 µm × 500 µm “windmill” pattern is designed and more than 300 000 nanorod units included. After the structures are transferred, the color filter can be gradually tuned by O2 plasma treatment. Moreover, the uneven height of as‐synthesized nanorods with different diameters can be evenly rescaled, implying a precise control over the vertical dimension. Lastly, an ultra‐high transfer accuracy is validated with a lateral displacement of less than 7 nm. The presented work demonstrates a facile and low‐cost transfer printing route toward ZnO‐based metasurfaces on flexible substrates.

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Tailoring properties of Ni0.50Co0.50DyxFe2–xO4 ceramics using microwave non-thermal plasma for high-frequency devices

Munir,

Naz,

Shukrullah

et al. 2024

Appl. Phys. A

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Cold plasma treatment of ZnO:Er nano- and microrods: The effect on luminescence and defects creation

Cited by 19 publications

References 81 publications

Free-Standing ZnO:Mo Nanorods Exposed to Hydrogen or Oxygen Plasma: Influence on the Intrinsic and Extrinsic Defect States

Free-Standing ZnO:Mo Nanorods Exposed to Hydrogen or Oxygen Plasma: Influence on the Intrinsic and Extrinsic Defect States

Transfer Printing of Solution‐Processed 3D ZnO Nanostructures with Ultra‐High Yield for Flexible Metasurface Color Filter

Tailoring properties of Ni0.50Co0.50DyxFe2–xO4 ceramics using microwave non-thermal plasma for high-frequency devices

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