Ultraviolet-light emission enhancement and morphology stability for ZnO:Ga nanorod array treated by hydrogen plasma

Li, Qianli; Hao, Shutong; An, Ran; Wang, Min; Sun, Zhi‐Wei; Wu, Qiang; Gu, Ming; Zhao, Jing‐Tai; Liu, Xiaolin; Zhang, Zhijun

doi:10.1016/j.apsusc.2019.07.149

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…Besides the PL and CL measurements, the X-ray excited luminescence (XEL) is a key measurement for evaluation of materials to be used as scintillators for high quality X-ray detection and imaging 9 . It constitutes a basis for scintillator material assessment in the field of ultrafast and hard X-ray detection 6 .…”

Section: Resultsmentioning

confidence: 99%

“…When compared to the planar crystal design, the scintillation light could be better guided through the nanorods in a nano array design, which leads to less scattering but high spatial resolution. For X-ray imaging applications requiring high spatial resolution, it has been shown by simulation and experiments that vertically aligned ZnO nanoarrays could help obtain high image quality and spatial resolution 9 – 13 . A nanoarray scintillator, which has additional light guiding reducing the scattering of X-ray generated optical photons as described above, could play a visible-light-converting role in the visible-light-converted type 2D-detector, which will be one of the main important components to affect image resolution 14 – 17 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, ZnO nanowire scintillators were successfully developed for high spatial resolution X-ray imaging using solution growth methods such as electrodeposition and hydrothermal 17 , 18 . ZnO nanorods were found to facilitate micron scale X-ray imaging which could be very useful for imaging cells and early cancer diagnosis 9 .…”

Section: Introductionmentioning

confidence: 99%

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Solution processed high aspect ratio ultra-long vertically well-aligned ZnO nano scintillators for potential X-ray imaging applications

Kurudirek,

Erickson

et al. 2024

Sci Rep

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We report the photon (PL), electron (CL) and X-ray (XEL) induced luminescence characteristics of high aspect ratio ultra-long (~ 50 µm) ZnO nanorods (NRs) and discuss the potential for fast X-ray detection based on the consistent and efficient visible emission (~ 580 nm) from ZnO NRs. Nanostructured ZnO scintillators were rearranged to form a vertically well-aligned NR design in order to help light absorption and coupling resulting in luminescent and fast scintillation properties. The design of the nanorod array combines the key advantages of a low-cost growth technique together with environmentally friendly and widely available materials. A low temperature hydrothermal method was adopted to grow ZnO NRs in one cycle growth and their structural, optical and X-ray scintillation properties were investigated. The relatively short (~ 10 µm) ZnO NRs emitting in the near-band-edge region were found to be almost insensitive to X-rays. On the other hand, the higher XEL response of long ZnO NRs, which is a key parameter for evaluation of materials to be used as scintillators for high quality X-ray detection and imaging, along with a decay time response in the order of ns confirmed promising scintillation properties for fast and high-resolution X-ray detector applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solution processed high aspect ratio ultra-long vertically well-aligned ZnO nano scintillators for potential X-ray imaging applications

Kurudirek,

Erickson

et al. 2024

Sci Rep

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show abstract

“…The effects of the hydrogen plasma treatment are, in general, approximately the same in the ZnO nanorods deposited on a substrate with a nucleation layer, as presently observed in the free-standing structures (see also Refs. [ 13 , 34 ]), i.e., the exciton-related emission band increases while the defect-related band becomes suppressed several times [ 42 , 43 ]. However, the influence of oxygen plasma is a bit different in the deposited ZnO nanorods as compared to the free-standing ones (see Figure 5 and Ref.…”

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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Interplay of Zn(OAc)2 concentration, morphology, and emission in hydrothermal-grown ZnO nanostructures

Solibet

Empizo

Angub

et al. 2021

Journal of Crystal Growth

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Ultraviolet-light emission enhancement and morphology stability for ZnO:Ga nanorod array treated by hydrogen plasma

Cited by 10 publications

References 35 publications

Solution processed high aspect ratio ultra-long vertically well-aligned ZnO nano scintillators for potential X-ray imaging applications

Solution processed high aspect ratio ultra-long vertically well-aligned ZnO nano scintillators for potential X-ray imaging applications

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

Interplay of Zn(OAc)2 concentration, morphology, and emission in hydrothermal-grown ZnO nanostructures

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