Transformation of ZnO-based structures under heavy Mo doping: defect states and luminescence

Buryi, M.; Remeš, Z.; Děcká, Kateřina; Míčová, Júlia; Landová, Lucie

doi:10.37904/nanocon.2021.4321

Cited by 4 publications

(8 citation statements)

References 14 publications

(21 reference statements)

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“…In order to follow the trend with the increased Mo content, the doping level of Mo was increased to 30 %. The ZnO:Mo(30 %) sample, however, appeared to be not ZnO but the mix of complex molybdates as it was also reported in [27,28]. Even in this case the knowledge of charge trapping processes is important for bonding peculiarities understanding as they are critical for phase purity of the material and charge/energy transfer there.…”

Section: Introductionmentioning

confidence: 76%

X-ray assisted point defects creation in micron-size Zn, Mo oxide particles at liquid nitrogen temperature

Buryi,

Babin,

Remeš

et al. 2024

J. Phys.: Conf. Ser.

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Charge trapping processes induced by the X-ray irradiation in the heavy Mo doped ZnO and MoO3 micropowders synthesized by the hydrothermal growth method were investigated in detail. Electron paramagnetic resonance (EPR) and thermally stimulated luminescence (TSL) were applied in a correlated manner to discover the role of the Mo doping in the charge trapping processes in ZnO. Thermally unstable oxygen- and molybdenum-related charge trapping centers were studied. Molybdenum and oxygen created electron-hole trapping pairs in some cases were observed. Some part of the hole trapping centers seemed to be directly connected with the creation of Mo5+. The correlation between EPR and TSL data was found.

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Section: Introductionmentioning

confidence: 76%

X-ray assisted point defects creation in micron-size Zn, Mo oxide particles at liquid nitrogen temperature

Buryi,

Babin,

Remeš

et al. 2024

J. Phys.: Conf. Ser.

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“…It is known that Mo and Zn easily form complex oxides (see, e.g., Ref. [ 36 ]) since Mo possess metallic and non-metallic properties with the ability to form salts. Therefore, the observed segregation of the molybdenum-based material phases occurs.…”

Section: Resultsmentioning

confidence: 99%

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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“…The composition of the ZnO:Mo(30%) sample was tentatively guessed to be the following: Zn3MoO9•H2O and Zn5Mo2O11•5H2O. Note, that the latter was also considered to exist in the ZnO:Mo(2-25%) [23]. However, the presence of pure, hexagonal ZnO in this complex sample can be in a negligible amount, below the detection limit of XRD.…”

Section: Structural Morphological and Surface Chemical Composition An...mentioning

confidence: 98%

“…Molybdenum is the transition metal which charge states can be easily changed (Mo 3+,4+,5+,6+ ) so it can contribute with some few electrons. The serious obstacle tailored with the Mo doping of the ZnO nanostructures grown by hydrothermal method is the fact that Zn along with Mo in oxide form creates some tiny amount of complex molybdates even at small Mo doping levels (below 1%) [2], [23]. They dominate over ZnO material phase at high doping levels (above 5%) [23].…”

Section: Introductionmentioning

confidence: 99%

“…The serious obstacle tailored with the Mo doping of the ZnO nanostructures grown by hydrothermal method is the fact that Zn along with Mo in oxide form creates some tiny amount of complex molybdates even at small Mo doping levels (below 1%) [2], [23]. They dominate over ZnO material phase at high doping levels (above 5%) [23]. On the other hand, the complex molybdates can serve as coatings for ZnO nanoparticles (grown separately and then additionally covered with the layer of molybdates) thus protecting them from ageing as it was demonstrated for the metal Zn [24].…”

Section: Introductionmentioning

confidence: 99%

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Charge traps in Zn- and Mo-based oxide microstructures. The role of Mo

Buryi

Ridzoňová

Artemenko

et al. 2022

J. Phys.: Conf. Ser.

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Peculiarities of the point defects creation under the X-ray irradiation and the influence of Mo doping in ZnO: Mo (10 and 30%) and MoO3 micro-powders fabricated by the hydrothermal growth method were studied in detail. It has been found that some new phases other than ZnO are created upon the heavy molybdenum doping. They were tentatively ascribed to complex zinc molybdates existing in the form of platelet flakes. The MoO3 sample contained both hydrated and anhydrous MoO3 phases in the form of microneedles. The molybdenum charge state was Mo6+ before X-ray irradiation in all the materials. X-ray irradiation resulted in creation of molybdenum- and oxygen-based charge trapping centres, i.e., Mo5+ and O− or O 2 − . Part of them is expected to exist in the pure ZnO and MoO3 phases whereas the rest appears in the complex zinc molybdates.

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Transformation of ZnO-based structures under heavy Mo doping: defect states and luminescence

Cited by 4 publications

References 14 publications

X-ray assisted point defects creation in micron-size Zn, Mo oxide particles at liquid nitrogen temperature

X-ray assisted point defects creation in micron-size Zn, Mo oxide particles at liquid nitrogen temperature

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

Charge traps in Zn- and Mo-based oxide microstructures. The role of Mo

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