Manifestation of oxygen desorption in photoluminescence spectra of ZnO

Akopyan, I. Kh.; Labzovskaya, M. E.; Lisachenko, A. A.; Novikov, B. V.; Serov, A. Yu.; Титов, В. В.; Filosofov, N. G.

doi:10.1134/s1063783416090031

Cited by 13 publications

(9 citation statements)

References 12 publications

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“…emission [41,42]. Similarly, it has been reported that oxygen desorption enhances the UV emission in ZnO [43,44]. Indeed, the XRD patterns in Fig.…”

Section: Discussionsupporting

confidence: 66%

Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

González¹,

Marin²,

Tirado³

et al. 2018

Mater. Res. Express

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Nanocrystalline ZnO films were grown on silicon substrate by hydrothermal synthesis at 125 °C, using diethanolamine as additive. A powder containing ZnO spheres, with diameters between 100 to 200 nm and formed by aggregation of ZnO nanoparticles, was also obtained as a secondary reaction product. The samples were studied by scanning electron microscopy, X-ray diffraction and photoluminescence (PL) spectroscopy. The effects of the [diethanolamine]/[Zn 2+ ] molar ratio on morphological, structural and optical properties were studied, as well as the effect of laser illumination (λ=325 nm) and annealing treatment on photoluminescence properties. The film samples exhibited a compact columnar structure, with thickness between 180 to 210 nm, which were not strongly affected by the diethanolamine concentration. The X-ray diffraction patterns from the films evidenced preferred orientation along the c-axis of the ZnO wurzite structure; while the nanospheres did not show any preferential crystalline direction. The PL spectra from the films showed large initial UV emission and a weak defect band centered in the yellow. A PL evolution while the samples were UV illuminated was observed. The relaxation of metastable phases (formed during the low temperature growth) involving the creation of point defects, is suggested. The predominance of the

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“…emission [41,42]. Similarly, it has been reported that oxygen desorption enhances the UV emission in ZnO [43,44]. Indeed, the XRD patterns in Fig.…”

Section: Discussionsupporting

confidence: 66%

Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

González¹,

Marin²,

Tirado³

et al. 2018

Mater. Res. Express

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show abstract

“…The possible mechanism responsible for the increases in photocatalytic activity is due to oxygen vacancies produced by the etching of argon-hydrogen plasma [45][46][47]. Oxygen vacancies are considered to be one of the main defects generated by carriers in ZnO, and the increase in oxygen vacancies concentration will increase the photocatalytic activity of ZnO [48]. First, the plasma particles have ultrahigh energy, which can modify the surface of ZnO to produce some defects without changing the lattice structure.…”

Section: Discussionmentioning

confidence: 99%

Enhancing Photocatalytic Activity of ZnO Nanoparticles in a Circulating Fluidized Bed with Plasma Jets

Huang

Hong

et al. 2021

Catalysts

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In this work, zinc oxide (ZnO) nanoparticles were modified in a circulating fluidized bed through argon and hydrogen (Ar–H) alternating-current (AC) arc plasma, which shows the characteristics of nonequilibrium and equilibrium plasma at the same time. In addition, a circulating fluidized bed with two plasma jets was used for cyclic processing. The catalytic degradation performance on Rhodamine B (Rh B) by Ar–H plasma-modified ZnO and pure ZnO was tested in aqueous media to identify the significant role of hydrogen atoms in Rh B degradation mechanism. Meanwhile, the effects of plasma treatment time on the morphology, size and photocatalytic performance of ZnO were also investigated. The results demonstrated that ZnO after 120-min treatment by Ar–H plasma showed Rh B photocatalytic degradation rate of 20 times greater than that of pure ZnO and the reaction follows a first kinetics for the Rh B degradation process. Furthermore, the photocatalyst cycle experiment curve exhibited that the modified ZnO still displays optimum photocatalytic activity after five cycles of experiment. The improvement of photocatalytic activity and luminescence performance attributes to the significant increase in the surface area, and the introduction of hydrogen atoms on the surface also could enhance the time of carrier existence where the hydrogen atoms act as shallow donors.

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“…The possible mechanism responsible for the increases in photocatalytic activity is due to oxygen vacancies produced by the etching of argon-hydrogen plasma [41][42][43]. Oxygen vacancies are considered to be one of the main defects generated by carriers in ZnO, and the increase in oxygen vacancies concentration will increase the photocatalytic activity of ZnO [44]. Firstly, the plasma particles have ultra-high energy, which can modify the surface of ZnO to produce some defects without changing the lattice structure.…”

Section: Discussionmentioning

confidence: 99%

Enhancing Photocatalytic Activity of ZnO Nanoparticles in a Circulating Fluidized Bed with Plasma Jets

Ma¹,

Huang²,

Hong³

et al. 2020

Preprint

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In this work, zinc oxide (ZnO) nanoparticles were modified in a circulating fluidized bed through argon and hydrogen (Ar-H) alternative-current (AC) arc plasma, which shows the characteristics of non-equilibrium and equilibrium plasma at the same time. In addition, a circulating fluidized bed with two plasma jets was used for cyclic processing. The catalytic degradation performance on Rhodamine B (Rh B) by Ar-H plasma modified ZnO and pure ZnO was tested in aqueous media to identify the significant role of hydrogen atoms in Rh B degradation mechanism. Meanwhile, the effects of plasma treatment time on the morphology, size and photocatalytic performance of ZnO were also investigated. The results demonstrated that ZnO after 20 minutes-treatment by Ar-H plasma showed Rh B photocatalytic degradation rate is ten times greater than that of pure ZnO, and the reaction follows a first-kinetics for the Rh B degradation process. Furthermore, the photocatalyst cycle experiment curve exhibited that the modified ZnO still displays optimum photocatalytic activity after five cycles of experiment. The improvement of photocatalytic activity and luminescence performance attributes to the significant increase of the surface area, and the introduction of hydrogen atoms on the surface also could enhance the time of carrier existence where the hydrogen atoms act as shallow donors.

show abstract

Manifestation of oxygen desorption in photoluminescence spectra of ZnO

Cited by 13 publications

References 12 publications

Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

Enhancing Photocatalytic Activity of ZnO Nanoparticles in a Circulating Fluidized Bed with Plasma Jets

Enhancing Photocatalytic Activity of ZnO Nanoparticles in a Circulating Fluidized Bed with Plasma Jets

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